NOT A RECALL? Brake Assist Failure! Service Brake Warning Message Tahoe Sierra Silverado 14-19
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- čas přidán 29. 02. 2024
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Power Brake Assist Failure is discussed in this video. We have a 2015 Silverado LYZ with the 5.3 v8 engine. This hidden failure was found on the Silverado after a routine service was performed and the vehicle was being pulled out of the shop. While braking the brake pedal became hard and a service brake assist warning message was displayed. TSB #PIT5361D: Diagnostic Tip - Additional Brake Pedal Effort was referenced and a diag was performed on the condition. It was found that the engine's belt driven vacuum pump was faulty casing low vacuum at the brake booster and loss of power brake assist.
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How many accidents have happened due to this problem and vehicle owners not knowing? Unbelievable! Good thing you detected the problem and warned the owner.
I expect none. When the engine is revving there is a lot of vacuum. And if its nor revving still enough to press the brakes at least twice. These kind of issues happen when the engine is low revving. (Warm engine stationary) Like in a parking lot. Manual shift cars will also not have this issue I suppose
@@mauricevandoeselaar I can imagine what Ray was explaining. If you're in a parking lot, and have to go back and forth to either parking or leave, it might be a cause for an accident due to brake failure.
Hey Ray I really hope you see this. This video completely saved me today. I was in heavy stop and go traffic going down a slight hill in my 2016 silverado and out of nowhere my brake pedal was going all the way to the floor, felt like it never has before. Immediately I'm convinced I have no brakes, desperately looking for somewhere to turn off the freeway only to find out I'm many miles away from an exit, stuck in very heavy traffic. My heart starts racing and then all of a sudden I somehow remembered watching this video. I thought to myself "if he's right, then I should be able to rev the engine a little to get vacuum and the brakes should come back". I waited to create a gap in front of me and then hit the gas a little and tested my brakes after, and thankfully they came right back. At that point I was able to figure out I have this exact issue, and instead of stopping in massive traffic and getting a tow I was able to understand the issue, all from randomly deciding to watch this video only a few days before the incident. Seriously, thank you. And yes, I've already ordered my replacement parts,
Thanks for this video!! I had started having some issues w/ my brakes making a grinding sound after I was leaving the car wash. When in reverse, it got worse but seemed to go away. As long as I was driving, there was no sound of grinding. I had to let the truck sit for several days while waiting on a windshield washer pump to arrive. I repaired the pump (Which was a MAJOR PAIN. Unbelievable what was involved in that tiny little repair). After the fix, I got in truck and headed down the street while wash, wash, washing my windshield. I came to a stop sign and NO BREAKS. It took both feet to try to stop. I took it back to the shop that just 3wks earlier gave me a "free brake inspection" with zero problems found. I was furious!! I felt that the shop did NOT do any inspection and just set me aside so that I would be back later for a complete brake job. They removed all 4 tires, and it showed that I had excellent pads & rotors. (only 55k miles). Made NO sense. Now, after watching your video, this makes complete sense!!! I feel like a scumbag for my accusations to the shop and I owe a hundred apologies to the employees, the manager that took his time to inspect my brakes AGAIN, took pics, and called me to show me that my breaks were fine. He did this AT NO CHARGE!! So, "Rainman Ray", Thank you for this video and I am your newest subscriber... Thanks, "thebake"
You must install a straw from the booster to the driver. It's the new emergency brake system.
I work at a GM delaer. In like 2019 they came out with a recall for this to reprogram the electronic brake control module to use abs activation to slow the vehicle down in parking lot maneuvers. It obviously didn't work, just GM trying to mask the vacuum pump issue. There is special coverage out for vacuum pump replacement, but I'm seeing it's starting to expire on some trucks based on mileage and age. I can't count how many vacuum pumps I've replaced. But after replacement I've never seen one back for the same issue
Thanks for adding some info on how manufacturers try to put band aids on the problem to save $$$ instead of just fixing it correctly 👍
I too work at a GM dealership, and can confirm every bit of this is true. We actually performed this fix on a truck today. The special coverage campaign requires replacement of the vacuum pump and belt.
I responded to that recall and can attest to the fact the reprogram did not work
There were 3 different versions 2 in September 1 in October.
Hard pedal no brakes can occur on any vacuum boosted vehicle, if the vacuum booster is failing. This is the assist module which is on vehicles with DOD/AFM (LT1/LT4 engines). The GMT800 trucks had an assist module for the 4.3 as it apparently couldn't develop enough vacuum like the V8s, then there is hydroboost alternative which is ran off the power steering pump.
So i believe in some instances the reprogram worked and in some requires a new assist module and vacuum booster, worst case would be the master cylinder and abs/proportioning valve
GM always hides anything they should fix if it can save them from covering it... I've had this hard brake pedal issue and it's sketchy...too bad GM is pushing customers away because they make junk and won't fix known problems. Just like the AC condensers that leak, or the rockers that rust out, or the 8 speed transmission... They hide from replacing even under warranty and as soon as it's out of warranty they will sell you the fix you've been complaining about at the dealership.
Thank you for being honest and not trying to charge the job without checking for dealer warranty.
I have a 2016 Sierra. It’s done this since day one, and I was never told anything about the service bulletin. Now at 240,000 miles, it’s too late and I’m on the hook for it. This should have been a recall from the start.
Back in the 60s to 90s (when vacuum controls were king) there was this thing called a vacuum reservoir, basically a metal can or plastic ball, that was inline on a major vacuum line to give additional vacuum for parking lot activity's.
That's true, but that reservoir kept vacuum applied to AC and heater controls mostly. The vacuum brake booster was plumbed separately.
As a truck camper owner, this is the perfect storm. When loading a 2-3 ton camper supported on 4 corner jacks, the 8-10' reverse movement is never "first time-one time" with fractions of an inch along the bed rails. Imagine getting hung up while backing up and not having the brake response you're used to. There goes a $50K camper onto its side-
Wow, can't believe they let that one skate by without a recall. Definitely a safety issue and GM knew it?
At least it would only be a low speed carpark nudge 😂
Gm is famous for avoiding recalls at all costs 😂
GM junk😊
@@joeymeyer3653ok ford not going into park and still rolling, happened in the 80s/90s and it still happens today, the pentastar 3.6 leaking oil before 100,000 miles or throwing a rod through the block? How about the ecoboost fiasco, ford and dodge aint any better and by far worse, try servicing a toyota or nissan for just a starter.
@@johnlarkin549 where people and their children walk.
I have a 2017 1500 Chevy Silverado, this happened to me while pulling a camper in heavy traffic with my family. The brake pedal went to the floor and barely stopped us. It’s a miracle we didn’t crash. GM dealer told me it’s the compressor and they will cover the repair. I can’t believe this is not a recall.
There is an extended warranty from gm covering the vacuum pump belt and pump replacement to 10 years 150k miles. I have sent more than a dozen of them over to my local dealer and had them replaced at no charge.
You really are the standard that all shops should be held. Thank you for what you do and how you do it.
Oh goody…a day without Ray is a day without gravity 😎 I just kind of floated around aimlessly all morning without vid
A lesser man and mechanic would've sent it. Example: I just got the entere suspension and steering system replaced on my beloved 2001 Honda Accord. I knew to ask "Did you align the car"? They. Did. Not. Apology from service manager accepted with prejudice. You Sir are a good man.
Ouch, they didn't have an in-house alignment rack in their shop?
I had a 15 that had the pump replaced. In addition to the hard pedal i had pedal pulsing when in a drive thru and applying light pedal pressure to creep ahead. The dealer covered it outside of warranty no questions asked
I like the "vacuum pump delete mod" that connects the brake booster to the manifold vacuum (like all the cars used to do), and you remove the vacuum pump and "plug the oil holes",,,,AND you gotta DISABLE the AFM (V8-V4 mode) to make sure the vacuum never falls too low.
GM even sells a "vacuum pump delete kit" ... it's just the 2 plugs needed to seal the two oil galley holes.
I did wonder why an engine the size of a small house needs an extra vacuum pump!!!!😮
Vacuum booster by itself can cause a hard pedal if its failing in any vehicle.
I can't imagine AFM activating would cause an issue - With how and when it enables (driving down the highway), you'd have reserve built up for a panic stop, and it would still be creating vacuum, just maybe not quite as much as all 8 running, but at idle/parking lot speeds, no issue.
Yes you are an honest mechanic! We need more of you!!
Love the wasp nest on the cap for the master brake cylinder.
Dirt Dauber
Toyota's have this vacuum pump mounted to the alternator on their Diesel engines. Yes, this pump is very expensive and I bought a brand new pump for a hilux 3L/5L engine and it was US$ 400! the pump works like a power steering pump with feather like slats that will extend as it spins.
Just to let you know, I've been watching awhile now and I had to change plugs on an Elantra. In my 60 years of working on cars without hardly any knowledge, Ive never touched a coil on top of spark plug. Thanks to you, I was able to change same with only one broken connector but I think it was a success. Pay no attention to the detractors. You provide a valuable service. Thank you Sir!!!
Light aircraft use an engine-driven vacuum pump to run the instruments. There's an oil-lubricated version that lasts forever but requires an oil return system, and a dry pump that uses graphite vanes. Because airplane engines sometimes run W.O.T, there isn't manifold vacuum in normally arpirated ones and of course supercharged ones don't have manifold vacuum. They did make an "emergency" kit that uses manifold vacuum, but the engine must be operated at partial throttle.
an accident waiting to happen! what a crazy design. it should be covered due to it’s safety issue!
and a poor design! great find . wonderful video! and learned something new!
2016 Suburban w/ 5.3 L engine owner here. Had this issue AFTER the original warranty expired :{. The job is pretty easy, but the replacement pump had been back-ordered for a couple of months. Finally got it sorted.. Should have been recalled!
Dude go look it up, there is 1
Experience and knowledge are priceless.
Most people wouldnt realize it was deficient and parking lot maneuvers would be hazardous.
GM doesnt notify or recall it.
Its a TSB for the situation where a customer notices.
Thats a terrible feeling as the truck drives into somebody or some thing in front of it or behind it.
Former gm tech here. Untold amount of these replacements. Should definitely be a recall. Even the vacuum pumps on the ecotech 4 cylinder ones seize too. It's camshaft driven so I've seen one snap the camshaft in half and crack the cylinder head. gm can not design these pumps to save their lives lol
It is go look it up
@@shadowopsairman1583 special coverage or recall? How long ago?
Was there a lot of transmission concerns with the the 17-18 trucks? Lookin to buy a new truck and I’ve been looking at a 17-18 Silverado with the 6 speed and a decent amount of people are saying that they’ve had to replace transmissions at 80-120k miles. Just curious if you ran into any of this.
@@spencerh8042 didn't see many transmissions hard fail or burn up with the 6 and 8 speeds, the biggest issue was always the torque converter shudder which I think the latest fix was flushing with a new design fluid
I replaced hundreds of vacuum pumps. I agree this is a real problem. If the owners of the trucks have any problems, they should not hesitate to take it to the dealership. I am a retired GM brake and front end mechanic. The pickup in my driveway that I purchased new is a 1990 Chevrolet 1/2 pickup. Brakes work just fine.
I am just imagining the carnage at the boat ramps, yikes!
Had that happen once with a ... probably a 60's full size Dodge sedan. Around 1970. Had nothing to do with repeated applications of brakes.
Got to where I was going, hit brakes. No assist.
Worked on way home, but I was terrified. Had booster replaced as I recall.
Excellent information on an issue swept under the rug!❤
Thank you.
Remember when they used a large tin can under the hood for extra vacuum boost now they use them for mufflers😂
That was a very interesting failure - thank you for describing it in detail.
I learned to drive cars back when they did not have brake boosters,
My 63 nor my 64ss impla had brake boosters on then the system was total hydrlic, you had to stand on the pedel fred Flintstone style to stop.
It wasn't until the 70s brake boosters started showing up.mostly on imports like Toyota.
yes - the old days when everything was an extra cost option. Power brakes had been around since the mid 50s - on luxury brands it was standard. On more basic lines (anything that wasn't Buick, Cadillac, Lincoln, Chrysler, Imperial) it was extra cost option. Near the mid 70s, power brakes became standard equipment
Great job calling this out.... Why in tarnation did they add complexity with an additional pump? Does the engine not create sufficient vaccum anymore?
I think it has to do with two or four cylinders being deactivated by AFM to increase fuel economy. If running on four cylinders at higher engine load (lower manifold vacuum), there may not be sufficient vacuum to provide adequate boost. I don't know for certain, but that sounds reasonable for adding a usually unnecessary part.
Good information to have. Thanks Ray.
My 2017 gmc Sierra 1500 ( 5.3) with 67k miles had the same problem and I called GM and explained the situation and they did cover the expense because of an extended warranty for that same problem. I took it to the GM dealership and explained the situation and at first they tried to not say anything about the extended warranty but I told them I called GM and they went ahead and fixed it with no charges.. I just had to wait a lil longer than usual because of parts shortage. They replaced the vacuum pump pulley and belt. Now my gmc sierra runs great with no more issues.
Hi Ray! I just wanted to say thank you again! I've been having some small issue in my car and without you and your videos, I wouldn't had the knowledge or the courage to tackle them myself. ❤
Ray your unique one of a kind ,your honesty is truly amazing and your so professional . I just wish other mechanic would follow you and do the same ,great job and video.
huge thank you for the information. I had not heard about that and my co-workers did not mention anything about that when I worked as a mechanic.
Cool heads up. Thanks for the upload.
Hard work and humility are truly commendable. Keep reaching.
Hooker headers.
Thanks for the heads up, I have a 17 Sierra 86,000 miles
Thanks Ray for the brake info,I have a 2015,no problem yet but at least I know what to watch out for.
In the late 70,s Dad was experimenting with a Detroit Diesel 353 or 351 in a 71 F250, and a diesel has no vacuum and had a pump that sort of looked like that one, only made out of steel, to run the brake booster, he had the same issue. He made a small tank and run the vac pump into , at least at idle you could still get about 6 or 7 pumps, before it went hard. This thing was kinda cool to drive as a kid, you just had to have some common sense, 67 mph up hill or down with a granny low 4 speed, at 2800rpm and thats all your going to get out of it, and noisy as hell, all the power you could ask for, or dared to tow with it, and 25mpg, and you dared NOT to kick it out of gear to do any coasting on long hills due to this issue!!. I could see a issue and a fender bender happen in bumper to bumper traffic on a steep hill at idle , towing something or loaded heavy in the bed with AC going to!!!
Fantastic video Ray.... That is a safety issues... Major issue!!!
Good grief what an excellent find! Wonder why GM hasn't been a bit more proactive for peoples safety... 😵💫😵💫🙂
Because they simply do not care.
Money. A recall for repair of the problem would cut into corporate profits.
Good advise Ray
Had a 2000 Silverado with the same problem. Pulled into parking lot,hit the brake nothing. Had hard brake petal . Took out relay for antilock. Problem solved.
Thank you for the education Ray.
I have a 2015 Silverado with 4.3L engine and have on occasion encountered the very issue you described. My truck is under 150k miles so will need to check with the dealership on if I fall under the extended warranty.
Thank you again.
Did you ever check? Having the same issue on my 2014 1500. I have 75,000 miles on mine and nearly had a heart attack on the interstate today when my brake pedal was stiff as a rock.
My daughter had a 2008 Trailblazer which had a problem with the fuel level sensor. Chevrolet never addressed it as a recall. She was always running low on gas and ran out on a local bridge. Naturally when drivers saw a car parked on the BIG bridge they thought of suicide and called the authorities. She called me for gas and I was shocked to see the police response to a car stopped on the bridge when I took a can of gas to her. After that I took it to the dealer and they replaced the fuel level sensor. they did give me a break on the cost but I still ended up paying for it.
You could have bought 1 and not deal with a dealership.
Maybe you should taught your daughter to check the odometer (tripmeter) or the amount of Miles left and have a clue about miles per gallon. If you know the meter is failing some math can help you. Just common sense I guess. maybe it's because I am European and try to solve the issue first instead of who can I blame for it. Things break down nothing to do with dealership or make or model.
Those vacuum pumps will make a clicking/knocking sound also!
Thanks for the video.
I was hoping there would be a video today, Friday March 1st, 2024. Thank you all at Rays Repairs. Oh no, No wife unit mandatory appearance. Hahah have a great day and weekend everyone...😊
Had the. Hard brake pedal happen many years ago in a 1973 Gremlin. Never knew why until now.
Excellent video. I watch your channel for the information and knowledge you present. Well done Ray
Clean the mud off that master cylinder cap... Reeeeeee
Hey ray you saved me hundreds of dollars and 3-4 hours of time by telling me there was a tsb on my 2014 Silverado for fixing this.I was going to replace this my self because of the hard pedal issue. I had already fired the parts cannon with the brake cylinder and that didn't solve the problem. You were correct about the 150,000 extended warranty.
Great find…thanks for sharing
Good to know. My Brother in law has a late model GMC Sierra Sherrod edition
Great video. Just a thought. You might want to invest in an articulated bore scope. Not expensive and a lot less hassle.
BAM. Early crew checking in.
Thanks Ray
Great video old Ray type video. Most excellent
Very interesting, Ray. I do wonder why GM went with vacuum boost if the engine cannot produce enough vacuum. After all, GM used Hydroboost brakes for many years, and quite reliably. Ford and Ram have also used Hydroboost in applications where engine vacuum may be insufficient.
It's due to cylinder deactivation, which ford and dodge suffer from too..
I know the vacuum booster on any vehicle can cause a hard pedal if it fails. Hydroboost has failed too.
Great public service announcement! Good job!
My 2011 MKX had a Brake Booster failure and it was replaced free by the Dealer long after the warranty expired. It was only a service bulletin. The Brake Pedal would just bleed off to the Floor.
Thank you, Ray, for this video! I own a 2017 Silverado and have experienced this issue a couple of times when pulling into my garage. I had to stand on the brake pedal to get it to stop. Both times I thought, "What the heck was that?!!?". Now i know! I'm contacting my dealership for an appointment to get this repaired! I'm only at 75,000 miles, so im hoping it's covered.
Did you ever check to see if it was covered? Having the same issue on my 2014 1500. I have 75,000 miles on mine and nearly had a heart attack on the interstate today when my brake pedal was stiff as a rock.
Worst come to worst, if you lose brakes while moving slowly, put the shifter to neutral to cut off the power from the engine.
Yep. Our company has a bunch of these and everyone has had this issue
I have noticed this situation on the vehicles i service at the dealership
This has to be the FIRST TIME I have ever heard Ray call one a silver-ROD-o and not silver-RAY-do or silvery-RAY-do
Good catch!
Thank You!
Great video Ray. Now I'm most interested to know what is that blob on top of the master cylinder reservoir cap?
Ray is the man
Wow you are GOOD!
Welcoming back!
Great videos
Vacuum pump, same thing happened on my Suburban a couple years ago. The dealer took care of it because there was a special service bulletin on it.
Wouldn't it run out in traffic starting and stopping, like traffic jam,? thanks for sharing, all the best to you and your loved ones
I have a 2015 silverado and the dealer replaced it under warranty at 130 k.
No problem since then.
You need to look into getting yourself a DepsTech DS630 borescope. The camera is articulated to make looking around a lot easier. The image quality is also pretty good.
I am sitting here in a west coast snow storm and I was hoping that this was a one hour video, I could use that right now ! But i will settle fora Rainman 11 minute one
Could you install a secondary vacuum reservoir to increase the volume of vacuum available? Probably cheaper than the pump replacement if GM denies the claim.
Have a 2016 there was a recall when it was about a year old never had a problem before or after
It’s just GM being GM.
My son has a friend who worked as an engineer for GM, he said when there is a conflict between engineering and the designers, the designers most always win.
Don't you mean accountants?
@@TheFirstStater I get what you are saying but it was a make it fit in our design, not let’s design it so it fits.
@@dwebs262 I used to support GM with their cateyes and OBS trucks, but nowadays a Yugo is a better option. They’ve gone so far downhill there’s no saving them anymore. The trucks are mediocre at best and complete money pits. Not to mention the rust problems in the newer generations here in the north. YIKES! I avoid GM nowadays.
@@zeropoint3518 I agree, especially after watching so many @SouthMainauto videos, I often wonder doesn’t anybody wash their vehicles when they get caked with salt? I mean it might slow down the process a tiny bit…😂
And the accountants outrank both...
interesting to see a vacuum pump used on a gasoline engine - in the past, manifold vacuum was used / Diesels used hydroboost systems since there's no engine vacuum present with that system
Notification squad Have a great weekend!🔥🔥🔥
I hate these vacuum pumps they used something similar on a 1982 blazer with the 6.2l diesel was always having issues
i was a gm tech for about 11 years, im almost sure i have seen maybe a tsb for the vacuum pump on the engine. for the 14-18 1500's
2 or 3 yr ago, i heard when it goes bad, it fill brake booster full of oil. but gm never made a recall for some reason, think i saw it on 1 the car wizard old video
super clean 2016...pretty...can you get the pressure off the old one before replacing? I am guessing its not pressure but can not supply enough volume.
Saving your viewers headaches, money and damage. Not to mention this. If you are backing up and push the pedal once, take you foot off the pedal to keep going and someone walks right behind the truck so you stomp on the brakes, loose assist and hit a pedestrian. You are saving someone being injured or possibly loss of life.
Good catch, Ray.
Wow, no good coasting down a big hill then!!!!😮
That shhhhhh is crazy 😮
I work for gm there’s special coverage for certain ones I believe 10 years 150k
Here we go again what do you got it for us today my friend😂😂😂
my 94 gmc 4x4 did that on start up. was told to rev engen befor moving truck.
Nice fix😂
I was so looking to see you replace the vacuum pump, do you have that video somewhere else? :)
Shame on manufacturers trying to hide legit recalls like this 😢