Question about 1981 Ford F 100
The brake bias valve can cause your symptom.Are the outer part of the brake calipers able to slide in and out freely .Jack it up take a wheel off and get someone to push on the brake pedal while you check for correct movement.Lube the slides so it is easier for calipers to return.a chunck of 4x2 wood is useful if you find them too hard to move by hand
Posted on Oct 09, 2008
Did you replace master cylinder with correct type?
If disc brakes fitted on front, there should not be a check return valve in front supply port.
Check supply pressure once brakes have started to hold, loosen one of front bleeders to see if any residual line pressure with pedal released.
Posted on Aug 04, 2008
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Posted on Jan 02, 2017
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Fig. 1: Loosen the front brake line in order to bleed the master cylinder
Fig. 2: Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid
Fig. 3: Always follow the lettered sequence when bleeding the hydraulic brake system
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