Brakes Locking
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Joined: Jul 2001
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Brakes Locking
I have a '72 F250 with 4 wheel drum brakes. After driving and braking 10 to 20 minutes the brake pedal won't depress any more and the brakes start to lock. If I wait a little while though the pressure bleeds off.
I checked with a mechanic and it was suggested it might either be the master brake cyl. not releasing the pressure from the lines or the rear brake lines themselves. I'm used to brakes failing...not locking. Any suggestions?
I checked with a mechanic and it was suggested it might either be the master brake cyl. not releasing the pressure from the lines or the rear brake lines themselves. I'm used to brakes failing...not locking. Any suggestions?
Logistics Pro
Joined: Jul 2001
Posts: 4,137
Likes: 41
From: Marble Falls, Texas
Brakes Locking
Heres what I would do. Replace the master cylinder, they are only like $14. Take about a gallon of brake fluid, and one of your buddies, and bleed the crap out of all four corners. That should take care of it. And your only in to it for about $20 and six pack of beer. If you have a break booster , you might want to give it a once over. Hope that helps.
RubberDuck
RubberDuck
Senior User
Joined: Jun 2000
Posts: 168
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From: Stratton
Brakes Locking
I had a similar problem earlier this summer. The problem on my rig was the adjusting arm from the booster into the master cylinder. We shortened it a couple of turns to allow the master cylinder to release and have not had a problem since. It is an easy adjustment and does not involve " opening the system". Check it out before buying anything. Good luck.
1971 F-350 1 ton dump, ground up fully restored w/ 360 motor
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