Spongey Brakes
New User
Joined: Dec 2015
Posts: 21
Likes: 0
From: OC CA
Sure did
Turns out that Ford issued a notice on this problem for the F350 series in they years around my 1990. They put too small of a Master cylinder on the trucks. I had to have an expert look into this and find it. He put on one with a larger inside cylinder. I think mine was 7/8" and he went to 1 1/8". The largest he could without modifying the mounting holes. The Power boosters on these are so powerful, they override everything. I spent over a month figuring this out. Even had to drop the camper because it wouldn't fit in the shop I took it to and they couldn't lift the 10,000 truck. Now if somebody can tell me how to make the self adjusters work properly, I'd be a very happy camper. Good luck with yours.
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
This should help:
https://www.ford-trucks.com/forums/1...-bleeding.html
Our trucks have a quirk in regards to bleeding the system. This link explains why and has some methods to work around the problem. From my personal experience, pressure bleeding is the way to go. If you've had the system disassembled upstream of the pressure differential valve, regular bleeding just won't cut it, no matter how many times you try. Make sure the rear brake shoes are properly adjusted, too.
This process markedly firmed up the pedal on my stock '84 F250.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
This should help:
https://www.ford-trucks.com/forums/1...-bleeding.html
Our trucks have a quirk in regards to bleeding the system. This link explains why and has some methods to work around the problem. From my personal experience, pressure bleeding is the way to go. If you've had the system disassembled upstream of the pressure differential valve, regular bleeding just won't cut it, no matter how many times you try. Make sure the rear brake shoes are properly adjusted, too.
This process markedly firmed up the pedal on my stock '84 F250.
https://www.ford-trucks.com/forums/1...-bleeding.html
Our trucks have a quirk in regards to bleeding the system. This link explains why and has some methods to work around the problem. From my personal experience, pressure bleeding is the way to go. If you've had the system disassembled upstream of the pressure differential valve, regular bleeding just won't cut it, no matter how many times you try. Make sure the rear brake shoes are properly adjusted, too.
This process markedly firmed up the pedal on my stock '84 F250.
Dave ----
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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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