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Old Dec 12, 2003 | 12:10 PM
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F250 brakes
I have a 1992 F250 7.3 diesel 4x4 My brakes wont hold pressure I replaced master cylinder and calipers had the system pressure bled. I dont have any fluid lose and vaccum is good. Can the prportioning valve let fluid bypass, or the rear anti-lock braking system valve let fluid to bypass.
 
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Old Dec 12, 2003 | 12:59 PM
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Neither one of those would be the problem.

Please explain what you mean by "it wont hold pressure"

are you saying your foot goes to the floor?

Did you replace the master with a new or reman unit?
 
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Old Dec 12, 2003 | 05:39 PM
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I replaced the master cylinder with a new one twice. the pedel slowly goes to the floor (sometimes it will hold)
 
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Old Dec 12, 2003 | 06:34 PM
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Does it pump up or does it just stay to the floor?
 
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Old Dec 12, 2003 | 07:28 PM
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They will pump up but slowly go's back down
 
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Old Dec 12, 2003 | 07:43 PM
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I would say there is still air in the system someplace without knowing the background of the problem. Sometimes air can be a real bugger to get out. There are a few tricks to it if you have problems.

What made you decide to replace the master in the first place? Was it for this problem?
 
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Old Dec 12, 2003 | 08:03 PM
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I replaced the cylinder for the same resone I was loosing brake pressure. I had a shop pressure bleed the brakes after the cylinder was replaced. the pedel does not go all the way down with motor off. if that helps
 
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Old Dec 12, 2003 | 08:50 PM
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I had a problem like you are describing on my 1990 F-150 with the rear abs. I replaced everything like you did and could not get a good pedal. Sometimes it was good...most of the times not. Anyway I bypassed the rear abs valve on the frame rail and that fixed the problem. Its worth a shot. Get some brake fittings from the store and bypass it. I bet it will work. Let us know how you make out
 
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Old Dec 12, 2003 | 08:52 PM
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forgot to add that you have to bleed the rear brakes after you bypass the abs valve.Good Luck
 
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Old Dec 12, 2003 | 08:57 PM
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Thanks I will check into that. Did you have any problems with rear locking up afterwords?
 
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Old Dec 12, 2003 | 09:52 PM
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Nope...drives just like a pickup without abs. The rear is pretty light so the rear brakes will lock first. But nothing out of the ordinary
 
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Old Dec 13, 2003 | 10:20 AM
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Did you bench bleed the master cylinder before you installed it?
 
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Old Dec 13, 2003 | 10:28 AM
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Thats what I was going ask, oppy.

Just becasue it was pressure bled doesnt mean there isnt still air in the system.

If the pedal pumps up, theres air in there someplace.
 
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Old Dec 13, 2003 | 10:54 AM
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Yes I did bench bleed the brakes.
 
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Old Dec 13, 2003 | 10:57 AM
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Brian if there is still air somewhere in the system. What is your suggestion. for getting it out.
 
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