chevy p-30 brakes
Had to replace my front rotors and pads and master cylinder. Bled all wheels and all working fine. Then they started dropping again to the floor. I noticed last trip after a hard climb through the nev...
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After a trip, my brake pedal got lower again. Brakes worked ok, but the pedal got lower as if the brake adjusters were frozen. Heat issue's solved but.........
First replaced the Master brake cylinder, again. The current one was 5 years old. Bench bled MC. Bled all wheel calipers with DOT5.1. It didn't help with the low pedal at all.
I pulled the rear disc brakes apart and guess what? There are no rear brake adjustors. None at all. The front and rear disc pads just wear and the pedal gets lower until you can't tolerate it anymore! What a great design!!! Duh!!!
I replaced the pads, but found that where the inside brake pad is installed into the caliper frame, the upper slot, had a groove worn into it by the brake pad. I emery clothed all my caliper to caliper frame surfaces and installed anti-seize. (silver silicon grease) That grove could cause the brake pads to hang up. Old pads were still at %50.
Bad news, the only way to repair those grooves is to replace the caliper frames. I would have to pull the axles to do that. It ain't broke, so.....
Road tested and set brake pads. Stops fast and straight. It raised the brake pedal level a whopping 2"!!!!! Leaving on a trip on Thursday for 10 days or so. All through I have only 20k or so on the front I may replace them too since I now know there are no brake adjustors in the system. Have to do that when I get back.
So, if you are having problems with your P30 brake pedal p30 stopping power, look to your rear disc brakes for answers before you replace your Master Cylinder. If you have p30 rear drum brakes, I'd pull the rear drums and clean your self adjustors/backing plates to make sure they haven't rusted or gunked up so bad that they are not functioning. I wouldn't be afraid to sand the brake shoes lightly to remove any glaze that has built up.
First replaced the Master brake cylinder, again. The current one was 5 years old. Bench bled MC. Bled all wheel calipers with DOT5.1. It didn't help with the low pedal at all.
I pulled the rear disc brakes apart and guess what? There are no rear brake adjustors. None at all. The front and rear disc pads just wear and the pedal gets lower until you can't tolerate it anymore! What a great design!!! Duh!!!
I replaced the pads, but found that where the inside brake pad is installed into the caliper frame, the upper slot, had a groove worn into it by the brake pad. I emery clothed all my caliper to caliper frame surfaces and installed anti-seize. (silver silicon grease) That grove could cause the brake pads to hang up. Old pads were still at %50.
Bad news, the only way to repair those grooves is to replace the caliper frames. I would have to pull the axles to do that. It ain't broke, so.....
Road tested and set brake pads. Stops fast and straight. It raised the brake pedal level a whopping 2"!!!!! Leaving on a trip on Thursday for 10 days or so. All through I have only 20k or so on the front I may replace them too since I now know there are no brake adjustors in the system. Have to do that when I get back.
So, if you are having problems with your P30 brake pedal p30 stopping power, look to your rear disc brakes for answers before you replace your Master Cylinder. If you have p30 rear drum brakes, I'd pull the rear drums and clean your self adjustors/backing plates to make sure they haven't rusted or gunked up so bad that they are not functioning. I wouldn't be afraid to sand the brake shoes lightly to remove any glaze that has built up.
