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Engineer of profanity
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Brake caliper rebuilds 20 degrees?
Can somebody please explain to me the relevence of the 20 degree position of the brake cylinders in the caliper rebuild? What is this in relation to? What has to be 20 degrees from what exactly? Is this saying the brake cylinders have to be slightly canted in toward the top of the caliper bores? I'm just not getting what to measure for 20 degrees.
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06-20-2011, 02:35 PM
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winter
Join Date: Nov 2007
Location: Vail
Posts: 1,688
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This will be helpful:
Pelican Technical Article: 911 Caliper Rebuild Once you review it let us know if you have additional questions. Good luck! 
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Tom '76 Targa |
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06-20-2011, 02:49 PM
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Registered
Join Date: May 2003
Posts: 3,346
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Here's the whole story. Brake pads drag when pushed against the rotor. Because of this they tend to "shift" to one side, that is, they try to tip into the leading edge of the pad. This will cause the pad to wear out on the leading edge before the trailing edge and also to eventually rock on the surface of the piston. Newer calipers use multiple pistons having smaller pistons on the leading edge side of the pad so the pad wears more evenly. Our calipers with only one piston put a cut on the piston so that only the trailing edge of the pad gets pushed on. This keeps the pad wearing evenly more or less. If you look at any of the picturs of how to install the pistons you will see the orientation. The angle is not critical but you should easily get it within 5 degrees with your eyeballs.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-20-2011, 06:50 PM
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