Title should say rotors get hot. Can't edit title?


Yesterday I replaced the rotors and pads on my 09 R56. I thought it went well, but in the first short test drive, it feels like the emergency brake is set a bit. I drove a half mile, and both rear rotors are hot.

Do I need to do anything with the emergency brake?

What else could it be?

 

Did you twist the calipers back in. the rear has what are referred to as actuated calipers. that require them to be pushed In and rotated simultaneously. I have had a few people bring cars to me complaining about the same problem after a break job. most auto parts store sell a tool that aids in the process of retracting the calipers.

 

Mreynolds, I did twist them. I didn't use the special tool, but was able to get the pistons to retract by carefully twisting with some channel lock pliers. Took a bunch of turns to get them back in enough to fit the calipers over the new fat pads.

 

Did you check the caliper slides? If they get stuck they can cause similar problems.

 

Hmm. I didn't. I guess I'll be taking the wheels off again.

 

I recently had a sticky caliper pin - the end with the hex hole got flared out
a tiny bit (maybe I overtightened it) and it was binding on the Tyrol brass
bushing I had installed. A new slide and a new bushing and all was fine.

 

It sounds like the piston wasn't pushed/twisted far enough back in and the calipers are dragging causing the heat buildup. The emergency brake settings aren't adjusted at all during a basic pad replacement. It also does sound like the caliper may not be floating on the slide pins. Did you clean and lube the slide pins with caliper pin grease? You do need to use the high heat caliper pin lube as regular lube isn't going to last.

Good luck.