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Rear calipers won't screw in to retract

slowta

Junior Member
36
8
8
Buick Ownership
Buick
As the title says, my rear pistons won't screw in so I can do my pads and rotors. The piston spins forever but there is no retraction at all.

I read somewhere that you need to screw the piston out, then back in, but that didn't work either.

The car in question is a 2011 Regal with vented rear rotors, 2.0 turbo, manual trans.
 

slowta

Junior Member
36
8
8
Buick Ownership
Buick
You have to push HARD while turning. Much harder than on the front pistons. So hard that you need to use all the parts of the caliper tool to push it in while turning!

In the attached pic you have to hold the collar with the hex head while turning the part with the bent handle. It doesn't make sense to me since the thread of the tool can't match all of the calipers internal thread... and I've also done brakes on cars where the cube piston tool worked with almost no pressure.
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OlSmokie

New member
11
2
3
Buick Ownership
Regal
I just replaced one of my rear callipers for the same reason. I even took it right off so I could work on it and nothing I did would allow it to screw back in. The other one screwed back in easily.
 

mlarabia

Buick Newbie
38
6
8
Northern NJ
Buick Ownership
'17 Buick Regal GS
could be seized. I've had this issue in the past where I could turn the caliper but it won't retract. I sprayed a little wd40 rust buster inside the rubber seal and let it sit for about 15 minutes and then I hit the sides of the caliper with a hammer (I did not wale on it but firmly tapped) to try and loosen up any rust inside. Worked great on my rear calipers in my 2007 Saab but didn't work so good on my Mustang.
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Jgriffin

New member
2
0
1
Buick Ownership
2013 Regal GS
"You have to push HARD while turning."

Definitely. I thought the same thing with mine, turned forever and got nowhere. Finally got them retracted, but it took a fair amount of effort.
 
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