D150 1/2 Ton Pickup 2WD V6-239 3.9L VIN X FI (1988)
Brake Caliper: Testing and Inspection
With Caliper On Vehicle
Fig 9 Caliper Assembly
Check for piston seal leaks (evident by brake fluid in and around boot area and inboard lining) and for any ruptures of piston dust boot.
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If boot is damaged, or fluid is evident, it will be necessary to disassemble caliper assembly and install a new seal, boot, (and piston if damaged
or corroded).
Check the mating surfaces of the abutments on the caliper and adaptor.
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If corroded or rusty, clean surfaces with wire brush. Inspect braking surfaces of disc.