Clarification is probably in order. Rear calipers have to be factory style per 7.32.8.6 of the CMC rules. Since the factory calipers didn't come with springs behind the pistons, they would not be legal in CMC. Good luck policing that...Originally Posted by GlennCMC70
Front calipers are open within some restrictions per 7.32.8.5. Those calipers could come with a spring behind the piston or you could add springs, as long as you keep under the cost limit. Legal for CMC in the front.
Pad knock back can come from many sources. There are different fixes depending on where it is coming from. Another cheap fix, beyond making sure everything you have is functioning properly, would be a residual pressure valve. Based on the wording in 7.10, I wouldn't think that would be ruled legal in CMC. If you have exhausted all other legal options, floating rotors/hats would be the way to go (legal front and rear per 7.32.8).
CMC summary: cheap fixes that would have a very slight performance hit - not legal. Stupid expensive fixes that would have other performance benefits for unsprung and rotational inertia - go right ahead...
Richard P.
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