brakes fading

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Apr 6, 2007 | 11:56 PM

qwik88

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From: ma

brakes fading

hi i have a 95 f350 psd and my pedal is fading to the floor if i hold pressure on them. i replaced the master cyl and ive done rear brake wheel cyl there are no visual leaks the truck sat with the res cover off for a few weeks i am wondering what could cause this problem? im thinking possible flex lines being bad
or a caliper being bad
but i dont want to throw 150 bucks down the drain if its not the calipers
thanks in advance
dan

Apr 7, 2007 | 07:04 AM

Lazy K

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Coukd be a faulty master cylinder. However I had the same problem with my `87 F250 and it turned out to be a faulty RABS valve unit. Unless your calipers are leaking it is unlikely to be them. There have been problems with flex hoses swelling under pressure but I would think it unlikely too. Are you sure you have no fluid leaks?

Apr 7, 2007 | 08:51 AM

qwik88

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From: ma

100percent positive theres no leaks

Apr 7, 2007 | 09:19 AM

Bruce R Leech

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From: Mulege south Baja ca. Mx.

did you bleed the equalizer valve?

Apr 7, 2007 | 05:24 PM

qwik88

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From: ma

is the equalizer valve what looks like a metering valve??? if so yes we did

Apr 7, 2007 | 05:32 PM

Bruce R Leech

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From: Mulege south Baja ca. Mx.

some times there is an air bubble that is just hard to get out . a couple of weeks ago I had a truck that I bled 2 pints before I got it.

Apr 7, 2007 | 05:34 PM

qwik88

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From: ma

we used a full 12 ounch bottle then like a quarter of a big thing that i had at the shop we bled each wheel atleast 15 times

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Apr 7, 2007 | 05:42 PM

qwik88

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From: ma

yes its dot 3

Apr 7, 2007 | 06:01 PM

#10

Bruce R Leech

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From: Mulege south Baja ca. Mx.

I think your next move should be to either replace or rebuild the master cylinder. it sounds like you have done every thing else right.

Apr 7, 2007 | 06:02 PM

#11

Bruce R Leech

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From: Mulege south Baja ca. Mx.

dont forget to bench bleed it before installing it

Apr 7, 2007 | 09:23 PM

#12

qwik88

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From: ma

i replaced the master

Sep 11, 2007 | 07:32 PM

#13

ibleedfordblue

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From: ALASKA

So What Is The End Result??????????

Sep 11, 2007 | 11:14 PM

#14

radialarm

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From: Boyd,TX

Ibleedfordblue, I guess he's another one of those guys that just use us for our knowledge, and only come back when they need more. It's a tough job,but somebody has to do it. hang in there man.