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Old 03-18-2003, 10:22 AM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
Chewed up my brake piston when rebuilding Caliper 83 240D

I am rebuilding my Brakes from a pair of ATE's I found in a junkyard. One of the calipers was stuck so bad, I had to use a huge pair of vise grips to extract it.
Unfortunately, I chewed/marred the top 3/16" of the machined piston area (no to be confused with the non-machined ridged area that sits on the top of the piston).
I still think I can still use this piston because the top 3/16" of the brake piston's machined area sits above the line where the caliper's internal seal seals the piston.
Does anyone know if I can?
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Old 03-18-2003, 10:56 AM
Posts: n/a
I have never tried such a thing, but I agree with your assessment. As long as you dress that part of the piston so that it works smoothly in the bore, I believe you will be okay. Do not, however, shrink the overall diameter of the piston at that point. Just dress down the high spots.

Good luck,
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Old 03-18-2003, 11:37 AM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
Agree that it's probably OK as long as you didn't do anything to the surface that contacts the dust seal and heat shield. If it was stuck so badly you couldn't get it our with air, though, I would think the caliper and piston would have a fair amount of corrosion.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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