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I am stumped on this truck it is a 1995 F250 Powerstroke 4x4. My problem started with the brake pedal slowly going to the floor when you apply the brakes I checked no leaks and no loss of fluid so I changed the master cylinder no luck then the vacume booster still no luck checked the brakes they where severly worn so changed all the brakes front and back still no luck. I thought maybe it was the RABS so I bypassed the lines that didnt help so I hooked that back up. I even figured that I got a bad master cylinder the first time changed it again with a new one instead of a reman no luck. If the truck is not running I have a good hard pedal that wont go down but as soon as the truck starts and builds vacume the pedal starts easing down while you press on it. The brakes stop the truck good but the pedal still keeps going down while you hold pressure on it. I called my local dealer and as usual their answer was we dont know but bring it by and leave it and we will check it. I would really like to know if anyone else has had this problem or what else I can check.
Is this you'r truck?the reason i ask is I worked at a school bus company and serviced a HUGE fleet of powerstroke vans and when you keep your foot on the pedal the pedal will drop. We never had a bad master or booster. if the pedal was low we would adjust the rear drums if it had them, and if still had problems we replaced the vacuum pump. We never even tested them usally just pushing on the peday 3-4 times in a row will sink it to the floor if the pump is bad.
No it is not mine. It is a truck that we use here at work for running parts and to go out into the field to inspect equipment. I have adjusted the brakes after test driveing the truck and that didnt help the problem the vacume pump tests out fine it holds the same vacume the whole time the truck is running.
Sounds like a problem I have had with 2 of my fleet trucks. Exact same symptoms (but these were Ch#*y's)....turned out it was the ABS sensors and VSS (vehicle speed sensors). We took them to the dealer, as most of our mechanics are diesel/heavy equipment guys...cost about $400 to fix.
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