Claudio Posted May 25, 2017 Share Posted May 25, 2017 (edited) Bike: 2003 R1150RT Due to a lost caliper bolt that went unnoticed for some time, I suffered some damage to my rear braking system (caliper was held only by front bolt and tilted up/forward as a result). For safety sake I replaced the disc and pads of course, however, I also noticed crumbling of the face of the rear caliper piston (attached image). I am leaning toward rebuilding the caliper but wanted a second opinion (maybe I am too paranoid). Assuming a rebuild is in order (it looks horrific to me), I can't seem to find the rebuild kit for the rear caliper that includes the piston. BMW only lists the seals? Anyone have a source for a complete kit (seals and pistons)? Edited May 25, 2017 by Claudio Link to comment
Michaelr11 Posted May 25, 2017 Share Posted May 25, 2017 You might take a look for a good used caliper. Put the caliper part number into a search - 34217660271 - and you should find a caliper available. Looks like approximately $46. That piston on yours is probably okay but you have to make that call. Link to comment
joeb Posted May 25, 2017 Share Posted May 25, 2017 Same bike , same problem. My caliper fell off at 70 mph and I didn't notice till I got off the bike about an hour later. I think all the braking I did caused the cracking as the Pistons were not pushing on an even surface. That was 70,000 miles ago. Still using the same caliper. I do check for degradation when I change pads and haven't noticed any, so I pretty much gave up worrying about it. Link to comment
AnotherLee Posted May 25, 2017 Share Posted May 25, 2017 Here's some more info on worn pucks I received: ***LINK*** Link to comment
Claudio Posted May 25, 2017 Author Share Posted May 25, 2017 Good to here its a plastic cap of sorts on the piston and nothing more. I'll monitor it for now and live with it. Brake and new disc are in and working just fine. Link to comment
Lowndes Posted May 26, 2017 Share Posted May 26, 2017 You might try this site for Brembo caliper parts: Munich Motorcycle Parts Link to comment
Lowndes Posted May 26, 2017 Share Posted May 26, 2017 Here's another source for Brembo parts and rebuild kits, plus other stuff: Bevel Haven Link to comment
Claudio Posted May 29, 2017 Author Share Posted May 29, 2017 Thanks Lowndes. These are great sources I didn't know about. Unfortunately the rear calliper (26/28 mm) has no rebuild kit that includes the pistons/pucks. I ended up ordering a used calliper (complete with ABS sensor and brake line which I don't need but a spare set of parts for my aging bike is never a bad idea). Link to comment
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