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08 Rear Caliper won't compress - any ideas?

BascomWD

New member
2008 GS SM5. Can't for the life of me get the rear caliper compressed! No, it does not SCREW IN. Repair manual say's use C-clamp, no go!! Even made sure the parking brake was backed out as well as opening a bleeder!
 
Do any of the similar threads listed below this post (or the last post in the thread, if anyone else replies. ;)) have any hints that might help?? :unsure:

There are a few listed referring to Spyders with the pre-2013 brakes, and IIRC, that Parking Brake arm can be used to help the retraction process, but it's been a bit more'n a minute (& a few TIA's :rolleyes:) since I played with the brakes on one of the early models, and as a result, I just don't remember exactly how/what/when... Sorry. 😖
 
You're correct. That piston does not screw in. So, by saying that the parking brake is fully "backed out" - Do you mean that you have removed the lever, and have turned the splined shaft FULLY CCW? That's what you need to do. Opening the bleeder is not necessary. I have always found that I didn't even need a C-clamp. I was able to use a wide blade screw driver in between the OLD pads, just like the manual describes doing it for the front calipers. But, if that isn't the case for you, the C-clamp is really pretty awkward and is hard to get it square with the piston. There are a multitude of piston compressor tools for just a few bucks, that work much better. Check around and pick one that works for you. Can't help you pick one - never needed one. But maybe somebody can. The root cause is probably that the piston has been extended too far out, and is now not aligned in the caliper and jammed. Work with it patiently and you'll get it back in.
 
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