Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 

Go Back   Keystone RV Forums > Keystone Tech Forums > Towing
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 10-14-2018, 11:59 AM   #1
Global Driver
Member
 
Global Driver's Avatar
 
Join Date: Jan 2018
Location: Aledo
Posts: 73
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.
__________________
2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
Global Driver is offline   Reply With Quote
Old 10-14-2018, 03:33 PM   #2
ctbruce
Site Team | Emeritus
 
ctbruce's Avatar
 
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
JMO, But I think you're kn the right track to have a professional diagnose and treat this patient.
__________________

Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
ctbruce is offline   Reply With Quote
Old 10-14-2018, 05:39 PM   #3
CarGuy
Junior Member
 
Join Date: May 2018
Location: Greenville
Posts: 9
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.
__________________
2012 Passport Ultra Lite 280BH
2006 Chevy Avalanche
CarGuy is offline   Reply With Quote
Old 10-14-2018, 06:06 PM   #4
travelin texans
Senior Member
 
travelin texans's Avatar
 
Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
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.
__________________
Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
travelin texans is offline   Reply With Quote
Old 10-14-2018, 07:43 PM   #5
sourdough
Site Team
 
Join Date: Feb 2014
Location: W. Texas
Posts: 17,601
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.
__________________
Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
sourdough is offline   Reply With Quote
Old 10-14-2018, 07:48 PM   #6
Global Driver
Member
 
Global Driver's Avatar
 
Join Date: Jan 2018
Location: Aledo
Posts: 73
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
__________________
2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
Global Driver is offline   Reply With Quote
Old 10-18-2018, 10:54 AM   #7
Global Driver
Member
 
Global Driver's Avatar
 
Join Date: Jan 2018
Location: Aledo
Posts: 73
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.
__________________
2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
Global Driver is offline   Reply With Quote
Old 10-18-2018, 11:21 AM   #8
bob91yj
Senior Member
 
Join Date: Jul 2018
Location: Escondido
Posts: 163
I'm a service advisor at a Chevy dealership, I've seen the vacuum pump issue as well.
__________________
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
bob91yj is offline   Reply With Quote
Old 10-19-2018, 08:05 PM   #9
Global Driver
Member
 
Global Driver's Avatar
 
Join Date: Jan 2018
Location: Aledo
Posts: 73
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
Global Driver is offline   Reply With Quote
Old 10-20-2018, 06:13 AM   #10
bob91yj
Senior Member
 
Join Date: Jul 2018
Location: Escondido
Posts: 163
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.
__________________
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
bob91yj is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by the Keystone RV Company or any of its affiliates in any way. Keystone RV® is a registered trademark of the Keystone RV Company.


All times are GMT -8. The time now is 07:59 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.