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Parking brake piston: OK or replace? (Page 1/1) |
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pmbrunelle
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JAN 03, 10:07 PM
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As part of a preventative (I noticed no symptoms from the driver's seat perspective) brake rebuild, I took apart a set of rear brake calipers.
On one of the pistons, the metal cap is slightly caved in on the edge by about 0.030":
Good to go ahead and use the piston as-is, or replace?
Can I take this apart, and flatten this with a hydraulic press?
This piston is from a Cadillac Seville caliper.[This message has been edited by pmbrunelle (edited 01-03-2021).]
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theogre
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JAN 04, 02:37 AM
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Likely someone drop the part. Nothing in the caliper should touch the cap except the large spring you see pulling the piston. Directly under the "cap" is a BB set w/ two thin "washers" as upper and lower races. See my Cave, Rear Piston notes
Bend the cap can be problems for P-brake and self-adjust as the BB maybe bad. Taking apart the piston isn't a great idea either even w/ "internet" saying can rebuild a iffy piston. Worse likely some rebuilder already torn it apart 1 to several times weakening the cap.------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
The Ogre's Fiero Cave
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pmbrunelle
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JAN 04, 11:24 PM
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10-4
I'll get another one.
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pmbrunelle
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JAN 11, 09:25 PM
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I couldn't buy just the piston, so I bought an entire Cardone caliper just to cannibalize its piston.
Its cap was slightly dented as well (but much less pronounced), but I just pried it a bit (from the outside, no disassembly required) with a screwdriver so the bearing race sat flat on the cap.
I removed the vent plug from the piston pictured above, and I found that it was wet with brake fluid inside, so I guess it was needing replacement anyway.
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