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Old 12-25-2009, 06:53 PM
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brake problem

51 ford truck with drum in the rear, disc brakes in the front and corvette mastercylinder/booster install on the frame. After 10 years of operation the brakes failed to the point that the only brakes I had was at or near the floor when the pedal was pressed. Quick look around found no leaking fluid such as might come from the rear wheel cylinders. Checked the master cylinder and it was all but empty.

Disassembled rear brakes, no fluid leak, repaired adjusters and adjusted brakes.

Replaced the master/booster...still no brakes.

Even though I found no trace of fluid in the old booster I replaced it.

Obvious question is where did the fluid go and why no brakes? The front calipers seem to work if I spin the wheels and apply the brakes (to the floor).

I'm perplexed and would appreciate some advice. I hate to troubleshoot by part replacement.

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Old 12-26-2009, 07:54 AM
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Did you bleed the brake system after all that changeover? I assume you did but you didn't say. That fluid had to go somewhere. I would get under the truck and have someone stomp on them like your stepin' on a snake! I had a problem like that and found a leaking brake line at a fitting half way between the master cyl. and the rear axle. It wasn't squirting on anything but straight down to the ground. If not leaking, I would continue to bleed the system untill the fluid runs clear starting with the passenger side rear, driver side rear, passenger side front, and drivers side front in that order.
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