Brake Caliper

[Aces11]

I have a 2021 GMC Acadia AT4. There was grinding sounded like coming from brakes. Went to change rotors and brakes. Both look like they are in great condition. Rear brake calipers won’t fully decompress. Any suggestions, or should I just change them?

 

[Steve300xcw]

electric parking brake on those things? I want to say you gotta plug into the computer to get em to relax.

Sure you dont just have some junk caught between the rotor and the dust shield?

 

[Geewhiz]

Both sides or just one side? Could also be a blockage in the brake line essentially acting as a check valve only allowing fluid to travel to the caliper and not return to the master cylinder, sometimes the inside lining of the break lines can delaminate and cause this. Loosen the bleeder valve on the caliper to relieve the pressure and see if it will relax.

 

[Aces11]

I did try the bleeder. Think Steve is on with the electronic parking brake. See if I can decompress that way. Thanks!!

 

[Steve300xcw]

I dont work on that new shit. Seem to recall reading that you manually back off the ebrake motor doodad


You might need to go youtube some stuff

 

[turbobrick]

Some pistons need to be screwed back in as well, I’m not up on if those trucks are that way. Bad news is, if they need to be screwed in, then yes, you now need new calipers.