1989 GMC,Safari I replaced brake pads this winter and it worked fine for a while than the right
front caliper started to hang up. So I replaced the rotor, caliper, and pads today and the brake
still hangs up. When I installed them I used new caliper bolts and lubed them so that it will
continue to float I cleaned the rotor with brake clean so no grease should be holding the brake
pads to the rotor. What do you think is causing that brake to hang up?
MW:
Thanks for being so detailed. Without driving the van, sounds like you have a problem with the
caliper hose. With age and mileage, the hose can become deteriorated inside and not let the
fluid which is under high pressure during brake apply, return to the maser cylinder after brake
release.
This will cause the caliper piston to stay partially applied. The way to check this is to have wheel
off and on a jack stand. Apply brakes a few times, release pedal, break loose the hose bolt at
the caliper slowly and see if fluid squirts out under pressure. Not just leaks, but squirts out. If it
squirts, and the piston / caliper releases, then you need a hose, then bleed that side. You
cannot tell by just looking at the hose.
front caliper started to hang up. So I replaced the rotor, caliper, and pads today and the brake
still hangs up. When I installed them I used new caliper bolts and lubed them so that it will
continue to float I cleaned the rotor with brake clean so no grease should be holding the brake
pads to the rotor. What do you think is causing that brake to hang up?
MW:
Thanks for being so detailed. Without driving the van, sounds like you have a problem with the
caliper hose. With age and mileage, the hose can become deteriorated inside and not let the
fluid which is under high pressure during brake apply, return to the maser cylinder after brake
release.
This will cause the caliper piston to stay partially applied. The way to check this is to have wheel
off and on a jack stand. Apply brakes a few times, release pedal, break loose the hose bolt at
the caliper slowly and see if fluid squirts out under pressure. Not just leaks, but squirts out. If it
squirts, and the piston / caliper releases, then you need a hose, then bleed that side. You
cannot tell by just looking at the hose.
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GMC Safari Brakes Hanging Up