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10-08-2015, 04:26 PM
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#1
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Senior Member
Join Date: Sep 2013
Location: San Luis Obispo, CA
Posts: 2,554
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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...
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10-08-2015, 04:48 PM
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#2
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Senior Member
Join Date: Feb 2013
Location: San Francisco/Nevada City
Posts: 3,769
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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.
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I'd guess there is a fluid leak.. Potentially in master cylinder if nothing looks leaky on the calipers. But I'm no mechanic.
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10-08-2015, 04:51 PM
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#3
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Senior Member
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
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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
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10-08-2015, 04:56 PM
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#4
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Senior Member
Join Date: Sep 2013
Location: San Luis Obispo, CA
Posts: 2,554
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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...
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10-08-2015, 05:00 PM
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#5
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Senior Member
Join Date: Feb 2013
Location: San Francisco/Nevada City
Posts: 3,769
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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?
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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.
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10-08-2015, 05:02 PM
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#6
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Senior Member
Join Date: Sep 2013
Location: San Luis Obispo, CA
Posts: 2,554
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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...
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10-08-2015, 05:02 PM
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#7
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Senior Member
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
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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
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10-08-2015, 05:17 PM
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#8
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Senior Member
Join Date: Aug 2010
Location: Taylor, Mississippi
Posts: 1,648
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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
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10-08-2015, 05:20 PM
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#9
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Senior Member
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
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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
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10-08-2015, 05:23 PM
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#10
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Senior Member
Join Date: Aug 2010
Location: Taylor, Mississippi
Posts: 1,648
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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
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