78 Ford Brake Issues
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Joined: Apr 2014
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78 Ford Brake Issues
I am working on a 78 ford f150 4x4.
The rear drum brakes keep locking up on the truck. I have replaced everything on this truck from front to back. the prop valve was the only used part put back in the truck and I took that out of a 79 parts donor truck that I recently stopped driving. the brakes bleed fine but after 12 to 15 pumps of the pedal the brakes shoes are stuck to the drums. if I open the bleeder screw on the wheel cylinder the brakes will compress back to normal but keep sticking time after time. not sure what else I can check. any advice or help on this would be great.
The rear drum brakes keep locking up on the truck. I have replaced everything on this truck from front to back. the prop valve was the only used part put back in the truck and I took that out of a 79 parts donor truck that I recently stopped driving. the brakes bleed fine but after 12 to 15 pumps of the pedal the brakes shoes are stuck to the drums. if I open the bleeder screw on the wheel cylinder the brakes will compress back to normal but keep sticking time after time. not sure what else I can check. any advice or help on this would be great.
Postmaster
Joined: Oct 2010
Posts: 4,656
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From: Northern and Southern Cal
First off, welcome to FTE.
I would go back to basics first.
Are you sure you reinstalled the rear hardware correctly.
It's easy to mess up.
Find a good pic of it, like in a shop manual.
Second, take another look at that prop valve. It could be filthy inside and hang up.
Brake problems are a pain because it's should be such a simple system.
Good luck, I'm sure more folks will chime in.
I would go back to basics first.
Are you sure you reinstalled the rear hardware correctly.
It's easy to mess up.
Find a good pic of it, like in a shop manual.
Second, take another look at that prop valve. It could be filthy inside and hang up.
Brake problems are a pain because it's should be such a simple system.
Good luck, I'm sure more folks will chime in.
Elder User
Joined: Jan 2014
Posts: 898
Likes: 3
From: Chillicothe, IA
At first i would of said you put the auto adjusters in backwards or on the wrong side, but since you can bleed off the system and it is fine for a minute, I don't think that is it. It sounds hydraulic. So I would look at the prop valve and master cylinder. Allas I am not a brake expert, but sure someone will chime in.
Elder User
Joined: Oct 2001
Posts: 544
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From: Jersey Shore Not Seaside!
The next time they lock back off the M/C retaining nuts and see if that also relieves the pressure. If it does the pushrod needs to be set. If not it's the drop down brake hose at the rear axle.
Lead Driver
Joined: Dec 2012
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From: Tennessee
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Elder User
Joined: May 2004
Posts: 836
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From: Shreveport, LA
All of the ones I've seen can be adjusted pretty easily, rather than replaced.
I'm sure there's a set of instructions that tell you proper measurements for it somewhere out there, but I've never seen 'em.
I'm sure there's a set of instructions that tell you proper measurements for it somewhere out there, but I've never seen 'em.
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Elder User
Joined: Oct 2001
Posts: 544
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From: Jersey Shore Not Seaside!
That was a mistype by me trying to do too many things at once. Practically all rods have a screw adjustment at the end. Some aftermarket masters are not machined as tight on the tolerances so it often with them that a readjustment needs to take place.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
This is the adjustment procedure from the Ford shop manual.It shows how to make a gauge to set the adjustment.
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