Brake Caliper Piston Configuration
04-01-2017, 11:53 PM
#1
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Squid
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Join Date: Mar 2016
Location: New Zealand
Posts: 39
Brake Caliper Piston Configuration
Upon reviewing the service manual, I note that the brake pistons are aligned such that the large pistons sit opposite each other, with the small pistons doing the same.
Would this not create unequal pressure on the pad?
In the above diagram, would pistons A not have more pressure to give the pad than the smaller pistons B?
Not so much a technical issue, but rather it got me wondering the above.
Would this not create unequal pressure on the pad?
In the above diagram, would pistons A not have more pressure to give the pad than the smaller pistons B?
Not so much a technical issue, but rather it got me wondering the above.
04-02-2017, 09:14 PM
#2
VTR virgin
Superstock
Join Date: Mar 2015
Location: Auckland, New Zealand
Posts: 446
The purpose of the staggered piston design is to improve the evenness of pad wear. As the brake is applied the leading edge of the pad will remain cooler than the trailing part of the pad as friction is created. To maintain even friction at the higher temperature, more pressure must be applied, so the trailing piston is larger in diameter. This allows a pressure differential between the leading and trailing edge of the caliper, thus providing an even wear pattern along the entire length of the brake pad, hence it controls brake taper.
04-03-2017, 01:16 AM
#3
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Squid
Thread Starter
Join Date: Mar 2016
Location: New Zealand
Posts: 39
The purpose of the staggered piston design is to improve the evenness of pad wear. As the brake is applied the leading edge of the pad will remain cooler than the trailing part of the pad as friction is created. To maintain even friction at the higher temperature, more pressure must be applied, so the trailing piston is larger in diameter. This allows a pressure differential between the leading and trailing edge of the caliper, thus providing an even wear pattern along the entire length of the brake pad, hence it controls brake taper.
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