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Bob Prosser's Avatar
 
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Odd dust seal on 3.2 caliper. Thoughts?

Hey. I just put fresh Metal-Master pads on all four corners of my '88 3.2. Everything was in very good and clean condition, except for one piston on the left rear. See the photo.



Although it is not cracked, caked or leaking, something has twisted. Think it is just the seal? Can a piston twist? The photo makes the calipers look bad, but truth is, for 140,000 miles (just spirited street -- no track use on this car), they look really clean -- just a patina of brake dust on them. The outsides are bright and shiny.

When the new Metal Master pads are warm, the car slows really strong. I broke the green pads in with a succession of 60-10 mph runs, as recommended by the "experts."

So, if it ain't broke, don't fix it -- or rebuild it?

Any thoughts?
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Old 03-21-2005, 12:37 PM
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I'm guessing the piston has rotated in it's housing taking the seal with it.
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Old 03-21-2005, 01:17 PM
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On my 74, so I'm not sure it applies, the pistons are supposed to be installed with little clips that lock into the indent on the piston to prevent rotation.
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Old 03-21-2005, 01:46 PM
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The piston has rotated in the bore ... no longer at the proper 20 angle.

Rebuild all of the calipers, now, and save yourself some grief later on ... be sure to use plenty of Dow Corning 4, 111, or 112 Silicone Grease on the pistons and seals during the rebuild!
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Old 03-21-2005, 01:55 PM
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Hi thanks for the input. No pins in this case that I know of ... at least none that I see here: http://www.pelicanparts.com/techarticles/911_caliper_rebuild/911_caliper_rebuild.htm
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Old 03-21-2005, 02:00 PM
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Bob, don't worry, there aren't supposed to be any pins on a 3.2L car, but I gotta say, seems weird that they would rotate like that. I wonder what could make that happen.
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Old 03-21-2005, 03:09 PM
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