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10-14-2018, 11:59 AM
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#1
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Member
Join Date: Jan 2018
Location: Aledo
Posts: 73
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TV Brake Quirks
Howdy y’all,
Got a situation that’s happened twice now. We have been backing into a spot and my driveway where I press the TV brake pedal and it has the slight resistance but goes full throw with little to no brake application.
The TT brakes is what’s stopping both vehicles. The TV brake pedal is fwd and I can use my foot to pull it back towards me, then it falls back fwd with pressure.
Once I unhook and let the TV chill, I can drive and all is fine.
Brake resevoir is full
Haven’t checked for air in the lines, as I thought that would have manifested itself already
Hot brakes maybe? I only drove an hour in light traffic.
Any other thoughts? Taking the TV for brake inspection tomorrow now that we are home.
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2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
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10-14-2018, 03:33 PM
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#2
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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JMO, But I think you're kn the right track to have a professional diagnose and treat this patient.
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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10-14-2018, 05:39 PM
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#3
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Junior Member
Join Date: May 2018
Location: Greenville
Posts: 9
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When brake fluid gets old it absorbs moisture, as the moisture heats up during brake applications the moisture boils turning into steam. Brake fluid is a liquid which cannot be compressed but the steam is a gas which can be compressed causing brake pedal to go to the floor with no brake action. This could be your problem or the old contaminated fluid will also cause brake master cylinders to fail, they work if you hit the brake rapidly but leak internally with slow application as when backing up. Brake fluid should be changed at least every two years. Not sure if this is your problem but you can test it by quickly jabbing the brake pedal then slowly depressing it, if the master cylinder is going bad it may leak during the slow application. This problem usually shows up when the weather gets cooler.
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2012 Passport Ultra Lite 280BH
2006 Chevy Avalanche
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10-14-2018, 06:06 PM
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#4
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Senior Member
Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
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If the pedal doesn't come up on it's own you've got a master cylinder or pedal linkage problem. If you're not comfortable with doing this type of mechanical work let the professionals do it, immediately.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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10-14-2018, 07:43 PM
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#5
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,674
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If you're hitting the brake pedal, it goes down, then you hit it again and it gets better, you have an issue. If that happens there are many things that could be wrong; bad (oxenagated) fluid, bad (leaking) brake cylinders, bad master cylinder etc. In the vehicles that I have experienced that in I, 1) replace the brake cylinders, 2) drain/flush all brake fluid and replace with new, 3) replace the master cylinder, 4) replace all brake pads/shoes etc. Some of that may be overkill but unless you know exactly what your problem is you just need to hit if from every angle...and it's not a really big deal.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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10-14-2018, 07:48 PM
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#6
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Member
Join Date: Jan 2018
Location: Aledo
Posts: 73
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Thanks for all the quick reply’s and info....heading to the local shop for expert fix tomorrow morning.
Let you know what they say
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2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
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10-18-2018, 10:54 AM
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#7
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Member
Join Date: Jan 2018
Location: Aledo
Posts: 73
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Brake fluids lush and fill didn’t do the trick.
Took it to the Chevy Stealership and the service tech immediately identified it as vacuum pump failing.
This is a “well known and documented” problem with 2015 Tahoe’s and Suburbans. $512 part plus labor.
Writing up a report to the NTHSA about this known brake problem that GM seems to not care to fix.
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2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
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10-18-2018, 11:21 AM
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#8
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Senior Member
Join Date: Jul 2018
Location: Escondido
Posts: 163
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I'm a service advisor at a Chevy dealership, I've seen the vacuum pump issue as well.
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2017 Outback 330RL 15th Anniversary Edition (stationary full timer)
2006 GMC 2500HD Duramax CC 4x4 w/SunLite pop-up camper
Dust Junkies Racing, 3 time Baja 1000 Class Champions
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10-19-2018, 08:05 PM
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#9
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Member
Join Date: Jan 2018
Location: Aledo
Posts: 73
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How often are you seeing this? Every documented instance I’ve read happen between 50-60K miles.
One visit fixes a brake issue and a loss of steering recall. Some info says GM is in a class action lawsuit over accidents caused by this issue.
Warm fuzzies indeed!
__________________
2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
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10-20-2018, 06:13 AM
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#10
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Senior Member
Join Date: Jul 2018
Location: Escondido
Posts: 163
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I really don't see it that often, just a handful of times at a fairly busy dealership. It happen's on Colorado's/Canyon's as well. The first time I encountered the problem the truck was at about 30k miles.
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2017 Outback 330RL 15th Anniversary Edition (stationary full timer)
2006 GMC 2500HD Duramax CC 4x4 w/SunLite pop-up camper
Dust Junkies Racing, 3 time Baja 1000 Class Champions
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