Disc Brakes aren't Brakin!!!!! HELP - Off-Road Forums & Discussion Groups
Ford Early Bronco, 66-77 All discussion of Early Ford Bronco's to 1977

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post #1 of (permalink) Old 06-17-2000, 04:08 PM
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Disc Brakes aren\'t Brakin!!!!! HELP

Well I got the new TSM Disc's in stalled and lines are blead, but now I've got a problem. The caliper pistons only move about 1/4" and then retract. They don't even contact the rotor enough to stop the rear axle when its off the ground and in drive. The main problem seems to be that the caliper pistion doesn't act like the front. When you pump the brakes they just go in and out, not contact the rotor than apply pressure to stop. Does anybody have any suggestions? These are 85 Eldorado calipers. If anybody has any knowledge of the rear system, please let me know. I tried to push the reset button on the proportion valve. I'm not sure if it has to be held in when doing this.



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post #2 of (permalink) Old 06-28-2000, 08:53 PM
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Re: Disc Brakes aren\'t Brakin!!!!! HELP

The problem sounds like the Master cylinder. If the piston in the master is too small, it won't push the disc brake piston. The calipers require a higer volume of fluid to move than the old drums. I have encountered this problem when I made the changeover, and solved it with a master cylinder from a 77 Bronco. Only problem is the hoses are on the wrong side. Do a little homework on a later model master cylinder from a vehicle with 4-wheel disc brakes, and you will find that it will bolt up correctly. Caddy's had disc brakes, and I know the master cylender has been used in old Bronco's, just not sure what year.
Hope this helps

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