Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
 


Reply
 
Thread Tools Display Modes
 
Old 10-08-2015, 04:26 PM   #1
Senior Member
 
mikracer's Avatar
 
Join Date: Sep 2013
Location: San Luis Obispo, CA
Posts: 2,438
Losing brake pressure at stops

My van has never had really good brake pressure or feel since I bought it last year. It's always been a little mushy and soft. Now at stop lights, the pedal will lose braking force and the van will creep forward unless I add more pressure to the pedal.

My question is, if there aren't any fluid leaks, would this just be air in the lines? Not sure when the last fluid flush was, but I've had it for about a year and a half and I haven't flushed them yet.
__________________

__________________
2005 E350 Chateau - V10 - Agile Offroad 4x4
2012 CTS-V Wagon - For the baby...
mikracer is offline   Reply With Quote
Old 10-08-2015, 04:48 PM   #2
Senior Member
 
rallypanam's Avatar
 
Join Date: Feb 2013
Location: San Francisco/Nevada City
Posts: 3,740
Re: Losing brake pressure at stops

Quote:
Originally Posted by mikracer
My van has never had really good brake pressure or feel since I bought it last year. It's always been a little mushy and soft. Now at stop lights, the pedal will lose braking force and the van will creep forward unless I add more pressure to the pedal.

My question is, if there aren't any fluid leaks, would this just be air in the lines? Not sure when the last fluid flush was, but I've had it for about a year and a half and I haven't flushed them yet.
I'd guess there is a fluid leak.. Potentially in master cylinder if nothing looks leaky on the calipers. But I'm no mechanic.
__________________

rallypanam is offline   Reply With Quote
Old 10-08-2015, 04:51 PM   #3
Senior Member
 
BajaSportsmobile's Avatar
 
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
Re: Losing brake pressure at stops

Check the fluid level to see if it is low, suggesting a leak, and look at each corner for leaks. Most likely you will not find an external leak, in which case the Master Cylinder is bad.
__________________
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.

AgileOffRoad.com
BajaSportsmobile is offline   Reply With Quote
Old 10-08-2015, 04:56 PM   #4
Senior Member
 
mikracer's Avatar
 
Join Date: Sep 2013
Location: San Luis Obispo, CA
Posts: 2,438
Re: Losing brake pressure at stops

Thanks guys. Is there any other way to confirm that the master cylinder is leaking internally?
__________________
2005 E350 Chateau - V10 - Agile Offroad 4x4
2012 CTS-V Wagon - For the baby...
mikracer is offline   Reply With Quote
Old 10-08-2015, 05:00 PM   #5
Senior Member
 
rallypanam's Avatar
 
Join Date: Feb 2013
Location: San Francisco/Nevada City
Posts: 3,740
Re: Losing brake pressure at stops

Quote:
Originally Posted by mikracer
Thanks guys. Is there any other way to confirm that the master cylinder is leaking internally?
I think if you have this symptom, and are losing fluid as per Ramsey, and you see no fluid on lines or calipers, then it's very likely the master cylinder. It's a cheap fix, you can can get a new reman for less than $100.
rallypanam is offline   Reply With Quote
Old 10-08-2015, 05:02 PM   #6
Senior Member
 
mikracer's Avatar
 
Join Date: Sep 2013
Location: San Luis Obispo, CA
Posts: 2,438
Re: Losing brake pressure at stops

Got it, thanks. I'll check fluid level when I get off work.
__________________
2005 E350 Chateau - V10 - Agile Offroad 4x4
2012 CTS-V Wagon - For the baby...
mikracer is offline   Reply With Quote
Old 10-08-2015, 05:02 PM   #7
Senior Member
 
BajaSportsmobile's Avatar
 
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
Re: Losing brake pressure at stops

You could run a pressure test...

Once you have confirmed no external leaks, bleed the brakes to confirm no air in the system.

If you hold light steady pressure on the peddle and it continues to creep to the floor it is the M/C bypassing internally. Not uncommon on these vans. M/C's are not expensive and a DIY project.
__________________
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.

AgileOffRoad.com
BajaSportsmobile is offline   Reply With Quote
Old 10-08-2015, 05:17 PM   #8
Senior Member
 
twogone's Avatar
 
Join Date: Aug 2010
Location: Taylor, Mississippi
Posts: 1,648
Re: Losing brake pressure at stops

Vacuum pump on my 95 was the culprit... but you may not have a vacuum pump on yours
__________________
'95 SMB E350 Quigley 7.3
https://www.taylorarts.com
... If you have to ask, you'll never understand...
"... torpedo'd, because we don't generally cotton to bullshit around here." -jage
"... do they ooch apart in the night?" -Dia
twogone is offline   Reply With Quote
Old 10-08-2015, 05:20 PM   #9
Senior Member
 
BajaSportsmobile's Avatar
 
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
Re: Losing brake pressure at stops

His is a V10, not a diesel - no vacuum pump. They can cause similar problems as can the ABS module.
__________________
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.

AgileOffRoad.com
BajaSportsmobile is offline   Reply With Quote
Old 10-08-2015, 05:23 PM   #10
Senior Member
 
twogone's Avatar
 
Join Date: Aug 2010
Location: Taylor, Mississippi
Posts: 1,648
Re: Losing brake pressure at stops

gotcha
__________________

__________________
'95 SMB E350 Quigley 7.3
https://www.taylorarts.com
... If you have to ask, you'll never understand...
"... torpedo'd, because we don't generally cotton to bullshit around here." -jage
"... do they ooch apart in the night?" -Dia
twogone 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Sportsmobile SIP or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 10:14 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
×