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Re: "bottom end stuff?" define? (archive)

[ Follow Ups ] [ 2002 Message Board ] [ Msg. Board FAQ ]

Posted by john on December 24, 1999 at 21:11:35:

In Reply to: Re: Resleeved? Define? don't mind surprises but... posted by Ken F. on December 24, 1999 at 11:40:45:

: : : : : Was planning on driving home for Xmas, when Mon. a front caliper locked on. I suspect corrosion in caliper piston wall. Although it may not be the best repair, plan on cleaning & renewing seals in caliper, and bleed system. (cash flow not available for a new caliper) It'll be a street side repair. Question. Any suggestions for popping piston out if a supply of compressed air is not handy? Thanks in advance and best for the holidays

: : : : i did it with the big screwdriver like the other reply to your post. be careful you don't drive the screw driver thru your hand (the one holding the caliper) A vise would be good, i don't have a big enough one. all 8 pistons sitting on my bench. i cracked off a small portion of one lip (by prying) not rendered inoperable. so look out and make sure you keep prying from different points around the piston as best you can (there's a couple really obvious GOOD spots) and they come out. biggest longest flat tipped you have. you need at least 12" of lever arm.
: : : : BTW, where did you (will you) buy rebuild kits? i'm the quintessential cheapskate and i'm poised to go w/ BMP (i could share phone, address, pricing, part #'s) but i keep thinking there's got to be a cheaper solution, since it's just 4 square o-rings and the dust boots (which you don't REALLY need) so maybe we could converse on parts sourcing. Good luck!
: : : : John

: : : 02 calipers need to be resleeved to be properly rebuilt. Unless you like 2" of travel between the pedal and floorboard and terrifying suprises at stop signals.

: Sure. After twenty + years of the pistons sliding back and forth the cylinder bore can become oversized. Just replacing the 0 ring is often not enough. You must remember the fluid is under considerable pressure when braking and,as in my case, finds its way around the seals. That is why when you buy a rebuilt set they have been resleeved to "true the bore."
: If this sounds like "bottom end stuff" the same forces are at work.

you lost me on this comment! obviously, newer is better, but if it don't leak, it's OK! I just want to make sure I get the best deal on a suitable repair. And my pistons and cylinders are fine. resleeving would likely amount to reduction in piston OD (centerless grind), plating back up to slight oversize condition and honing out piston bores to accept reworked pistons. all with net result of the OD/ID combination currently on my bench.
Braking pressures and temperatures are severe, so i agree that attention to detail and proper repairs are important. there's just more than one way to look at anything. i'm not the type to throw money at something that doesn't need it.

Merry Christmas! Thanks for the discussion.

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