brake problems - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 06-05-2009, 12:24 PM Thread Starter
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brake problems

I don't drive my 1996 PSD much. I noticed the brakes seemed soft and found it was low on fluid. I assumed it had a leak. I inspected everything closely and found no leak. Maybe the low fluid was just wear on the brakes and I hadn't checked it. It seems to stop ok, but if I continue to hold pressure the pedal goes to the floor. I replaced the mastercylinder and bled the brakes and same problem. I noticed while bleeding the brakes with the engine off there is a weird noise coming from a valve attached to the power steering pump. It seems to be connected to the booster and I think it's vaccume related. Even if the booster was bad that should just mean I have a hard pedal, not that it would go the floor, right? Any ideals?

96 F-350 XLT 4x4 Quadcab, 7.3, auto, 300k, 3.5 gears, 4" exhaust, 3.5" downpipe, Tymar intake, guages, and superchips 1701 tuner
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post #2 of 2 (permalink) Old 06-06-2009, 02:11 PM
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this is a pretty common problem that happens to the OBS trucks. there are several thinks that can cause it.

I am with you I don't see where a bad booster would cause a soft pedal, but I do remeber some one posting on here a while back that there is an updated booster that is suppost to fix that problem. it maybe worth checking with ford to see if there is a Tecnical service bulliton about it.

Other than that check over all your hoses and callipers, old hoses can swell under pressure wich would give you a soft pedal and the calipers can be week and be giving some too.

you can also try bypassing the ABS valves to see if they are bypassing some fluid.

good luck and let us know what you find

Ross
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