Brake problems

GubNi

GubNi

8 lug disc brakes?
Joined
Mar 20, 2005
Location
Jonesborough, TN
I have a 96 F350 4wd diesel. The problem is it has virtually no brakes. With the engine off it has some brakes, but with it running the pedal goes to the floor. It goes about 80% then slowly goes the rest of the way.

I have put on 2 new (not reman) mastercylinders, right front caliper (bleeder broke), new rear shoes, and ebrake cables. Most of the hard lines have been replaced. I have bleed through about 2 gallons of fluid and even bled the porportioning valve. I tried another booster and it didn't help so put the original back on. I also replaced the sensor that plugs into the master cylinder at the end.

At this point I've done everything and have no more ideals.

I have not replaced wheel cylinders (they aren't leaking)

I have not replaced any rubber hoses (they are not dry rotted or swelling up)

I have not replaced the left front caliper

I have found that the right rear backing plate is bent about 3/8" in at one side which might be causing a problem with the shoes seating.

I'm sure something I've done is wrong or it's another problem that I haven't thought of.
 
The rear brakes are adjusted properly other then the bent backing plate?
Is there any adjustment on the rod on the master cylinder?

I did have a issue on a couple trucks, the calipers were holding air and there was no way to get the air out through the bleeders. I had to pull both calipers off, get the pistons pushed out as far as I could safely. I opened the bleeders and with a big pair of channel locks I pushed the piston back in the caliper and closed the bleeder. It had the same symptoms that you are experiencing.
 
Found the problem. Autozone gave me a MC with a 1" ID and the original was 1.25" ID. I just swapped it out and it's fixed now.
 
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