I have a 91 GMC truck, the passenger side front brake caliper piston is not returning after I press on the brakes, I just replace the dust boot and the square cut seal and cleaned out the caliber,
10

Asked by Henryp39 Sep 25, 2015 at 06:33 PM about the 1991 GMC Sierra 1500

Question type: Maintenance & Repair

I used brake fluid to lubricate the
square cut seal in the dust boot, and I
bled all four brakes extremely well, I
will have to save my master cylinder
is leaking from the back, could this be
causing my piston to not return?

5 Answers
189,535

Paul answered 9 years ago

No you need to change the caliper that is what is locked up on you...

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Henryp39 answered 9 years ago

I was hoping to save some money that's why I bought the repair kit and not the whole caliper, I'm going to take the caliper off clean everything out, remove the piston and the seals and lube them with new brake fluid then reinstall it.

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Henryp39 answered 9 years ago

yes I've had a couple others tell me it could be the brake line pinching as well, the complete caliper and piston rebuilt is only $22, the brake hose i assume is the original, it's dry but flexible. is there some way for me to test the flexible hose at home?

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Henryp39 answered 9 years ago

I replace the driver side and the passenger side hoses, and bought a rebuilt brake caliper for the driver side front, it still having the same issue, do I need to rebuild my brake master cylinder?

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Henryp39 answered 9 years ago

okay so I rebuilt the master cylinder, I have to say the brake pedal has never been firmer, feels like it would stop on a dime, but the passenger side front will still not release, when I left the vehicle overnight the caliber seems to retract, but once I press the pedal a couple of times it holds pretty solid can't seem to get the vehicle over 25 or 30 mph

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