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Old 02-08-2006, 10:49 PM   #1
uber e36
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Cleaning Caliper Pistons

Gents,

As you have read, my calipers are going in to get sandblasted/powdercoated.

Two questions:

1. How should I clean the outside surface of the pistons? Especially the bit of rust/dust that has formed (see PIC 2)?

2. How should I clean the inside of the pistons (see PIC 3 & PIC 4)?

Thanks and hopefully some others learn from this post for when they decide to rebuild their calipers...

-Geoff
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Old 02-08-2006, 11:34 PM   #2
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You could try soaking the piston in CLR or canadian tire sells something called evapo-rust I haven't tried either though.
http://www.evapo-rust.com/
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Old 02-09-2006, 12:02 AM   #3
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when they get sand blasted all that shit will come off.
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Old 02-09-2006, 08:46 AM   #4
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^^ From what I understand, the pistons don't get sandblasted, because it will damage their surface...

The only thing you sandblast is the raw metal caliper (noting to thread bolts and brake line into the appropriate holes so sand doesn't ruin the threads).

Big T - I'll look into both CLR and Evapo Rust!
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Old 02-09-2006, 09:35 AM   #5
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You can get them professionaly rebuilt for $65 per corner. My old mech did this for me (to bad he is no longer in business) and I could not tell them from new. They were bead blasted, new seals and pistons looked new. They came to pick them up and dropped them off, it was in the area of the old marranello bmw.
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Old 02-09-2006, 09:51 AM   #6
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can't you replace the pistons?
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Old 02-09-2006, 10:13 AM   #7
uber e36
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From my research, the pistons don't have their own part number... They only come with the caliper...
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Old 02-09-2006, 12:25 PM   #8
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I remember seeing a caliper rebuild kit somewhere.
Try a search on the web.
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Old 02-09-2006, 02:55 PM   #9
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^^ Yup, there is... I just thought it was the seals and not the piston. But I'm going to search further - some ppl I've spoken with think the rebuild kit comes with a new piston.
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Old 02-09-2006, 09:07 PM   #10
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I bought the kits and returned them, it is only the seals.
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Old 02-09-2006, 10:36 PM   #11
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buy an steel brush for the drill to clean the inside ...the outside ( the sliding area )take the stuff u clean pots with and some gas or varsol and start rubbing
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Old 02-11-2006, 08:03 PM   #12
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^^^ Thanks!
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