 Front piston retaining plate |
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| Pachla |
 Jun 30 2017, 07:39 PM
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#1
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Newbie  Group: Members Posts: 5 Joined: 3-February 17 From: Georgia Member No.: 20,808 Region Association: None  |
What does the piston retaining plate do on the front brakes? Mine are all bent up.
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| Bob L. |
Jun 30 2017, 08:39 PM
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#2
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Senior Member Group: Members Posts: 848 Joined: 7-August 11 From: Austin TX Member No.: 13,411 Region Association: Southwest Region |
It prevents the piston from rotating in the caliper bore.
Why? (IMG:style_emoticons/default/confused24.gif) |
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| Firstcar |
Jun 30 2017, 09:24 PM
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#3
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Obsessive amateur mechanic Group: Members Posts: 98 Joined: 17-March 11 From: MA -South Shore Member No.: 12,831 Region Association: North East States |
QUOTE(Bob L. @ Jun 30 2017, 10:39 PM)  It prevents the piston from rotating in the caliper bore. Why? (IMG:style_emoticons/default/confused24.gif) 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. |
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