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914World.com _ 914World Garage _ Front piston retaining plate

Posted by: garrysharp@bellsouth.net Jun 30 2017, 07:39 PM

What does the piston retaining plate do on the front brakes? Mine are all bent up.

Posted by: Bob L. Jun 30 2017, 08:39 PM

It prevents the piston from rotating in the caliper bore.

Why?

Posted by: Firstcar Jun 30 2017, 09:24 PM

QUOTE(Bob L. @ Jun 30 2017, 10:39 PM)

It prevents the piston from rotating in the caliper bore.

Why?

Because the face of the piston that contacts the pad has a slight angle to it and is supposed to be installed in a particular orientation in the caliper. I think the designated angle helps the pad bite the rotor properly, prevents pad vibration/squeal and helps the pad wear more evenly. The plate prevents the piston from rotating in its bore ensuring it retains the proper angle.