Ryan in Texas Posted March 6, 2016 Share Posted March 6, 2016 Sometimes when I'm driving at low speed, I hear a grinding noise from the rear passenger side wheel. Then when I apply the brakes, the sound goes away. It's like a rubbing/grinding noise, very annoying. I'm sure it's the brake pads contacting the rotor, but I don't know why. The pads are new. I lubed the caliper slides with the proper grease and they are not stuck or anything. I'm thinking the piston is not retracting? Is their a way to lube the piston? It's not the wheel bearing, I"m almost 100% it's the pads making the noise on the rotor. Any help is appreciated, thanks. Link to comment Share on other sites More sharing options...
Dujo Posted March 6, 2016 Share Posted March 6, 2016 It's a sticky caliper. Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 6, 2016 Author Share Posted March 6, 2016 It's a sticky caliper. Does it need to be replaced, rebuilt, or lubed? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
shadowsports Posted March 6, 2016 Share Posted March 6, 2016 Sometimes when I'm driving at low speed, I hear a grinding noise from the rear passenger side wheel. Then when I apply the brakes, the sound goes away. It's like a rubbing/grinding noise, very annoying. I'm sure it's the brake pads contacting the rotor, but I don't know why. The pads are new. I lubed the caliper slides with the proper grease and they are not stuck or anything. I'm thinking the piston is not retracting? Is their a way to lube the piston? It's not the wheel bearing, I"m almost 100% it's the pads making the noise on the rotor. Any help is appreciated, thanks. Ryan, EDIT*** Wait a second.... REAR wheel. Make sure the parking brake is not adjusted too tight on that wheel (STAR adjuster... if its tight, the wheel will drag and you will hear grinding. Below may not apply........... If the sound absolutely stops when the brakes are applied, then its not the wheel bearing like Dujo suggests. If you've greased the slides and the caliper is floating properly, its the piston. Its possible to buy a caliper rebuild kit and replace the seals, etc. If its corroded on the inside, that won't work. Its quicker to buy a new caliper, replace, bleed and be done with it. Link to comment Share on other sites More sharing options...
08SpecB_DE Posted March 6, 2016 Share Posted March 6, 2016 They are cheap enough so just replace it. You can try cracking open the bleeder screw on the caliper and see if the piston compresses. If it does, then you have a collapsed brake hose. The rear calipers should compress very easily, you may even be able to do it by hand. Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 7, 2016 Author Share Posted March 7, 2016 I checked the ebrake and it was ok. Ordered one rear right caliper from AAP. NAPA could not get, Oreilly could not get, Dealer charges 300 for the part, so AAP it was. A rebuild kit is only 4, but I'd rather have the whole new thing with slides and clean pistons. Worth 100 and an hour of my time. Thanks for help! Link to comment Share on other sites More sharing options...
08SpecB_DE Posted March 7, 2016 Share Posted March 7, 2016 Did you check the hose? Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 7, 2016 Author Share Posted March 7, 2016 Did you check the hose? I gave a visual to it, didn't see any leaks. Link to comment Share on other sites More sharing options...
08SpecB_DE Posted March 7, 2016 Share Posted March 7, 2016 You want to make sure it's not collapsed internally. Brake hoses have a much smaller diameter than people think and although it looks normal, it's bad. If you can't compress the piston, crack open the bleeder screw and see if that helps. Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 7, 2016 Author Share Posted March 7, 2016 You want to make sure it's not collapsed internally. Brake hoses have a much smaller diameter than people think and although it looks normal, it's bad. If you can't compress the piston, crack open the bleeder screw and see if that helps. The piston compresses. It's a very intermittent problem and happens about 40% of the time. I had no issue compressing the piston when I lubed the caliper slides last week. So it might be in the beginning of the failing stages. Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 10, 2016 Author Share Posted March 10, 2016 Ryan, EDIT*** Wait a second.... REAR wheel. Make sure the parking brake is not adjusted too tight on that wheel (STAR adjuster... if its tight, the wheel will drag and you will hear grinding. Below may not apply........... If the sound absolutely stops when the brakes are applied, then its not the wheel bearing like Dujo suggests. If you've greased the slides and the caliper is floating properly, its the piston. Its possible to buy a caliper rebuild kit and replace the seals, etc. If its corroded on the inside, that won't work. Its quicker to buy a new caliper, replace, bleed and be done with it. Dude... I think the E brake might be it. Just for shiz and giggles, I applied the ebrake while coming up the driveway. SAME exact sound from that wheel. I"m gonna back it off using the cog access on the rotor and see if that helps. Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 14, 2016 Author Share Posted March 14, 2016 Rebuilt caliper today after I discovered fluid leak from the seal. 2 hours when you include the reassembly and brake bleed. I think I'm fixed. Link to comment Share on other sites More sharing options...
Ryan in Texas Posted March 15, 2016 Author Share Posted March 15, 2016 Yup. Fixed. Drove all day and noise is gone. I'll rebuild the other rear sometime soon. It's really easy and the kit is 3 dolla compared to a rebuilt caliper for over 100. Link to comment Share on other sites More sharing options...
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