rob_sri Posted November 20, 2016 Share Posted November 20, 2016 Looking at the prices of a new master cyl being circa £350 and a rebuild kit being around £60-70 for a OEM seal kit Anyone rebuilt their master cylinder? How hard is it to do? Any advice! Or is it worth biting the bullet for a new one.. I've recently fitted new brakes, I'm going to be fitting braided lines and I'm wondering about giving my MC a refresh too whilst I'm at it Mine isn't shot and still works but I recently changed my brake fluid and it seemed to darken very quickly.. not sure if this is a sign of a failing system with worn seals Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 20, 2016 Share Posted November 20, 2016 I have done loads and so long as you clean the parts to be reused thoroughly with brake cleaner and dry, and assemble with either Girling Red brake rubber grease, or clean new brake fluid it's straightforward. Only caveat is if the bore of the master cylinder being rebuilt is scored. You can lightly hone them out, but beyond that a stainless sleeving is uneconomic, just find a good used one or buy new. I do sleeve rare master cylinders and some calipers, but unless a new one is unavailable, or silly money, it's not worth it. Quote Link to comment Share on other sites More sharing options...
rob_sri Posted November 20, 2016 Author Share Posted November 20, 2016 I have done loads and so long as you clean the parts to be reused thoroughly with brake cleaner and dry, and assemble with either Girling Red brake rubber grease, or clean new brake fluid it's straightforward. Only caveat is if the bore of the master cylinder being rebuilt is scored. You can lightly hone them out, but beyond that a stainless sleeving is uneconomic, just find a good used one or buy new. I do sleeve rare master cylinders and some calipers, but unless a new one is unavailable, or silly money, it's not worth it. I'm hoping that mine isn't that bad being as it seems to operate okay! Just seems like a worthwhile job to do if the fluid is getting grubby quickly.. my thoughts are the seals are letting moisture in and a rebuild kit seems pretty well priced cheers Chris Quote Link to comment Share on other sites More sharing options...
rob_sri Posted November 28, 2016 Author Share Posted November 28, 2016 To anyone searching.. it's very easy.. remove the two bolts and the lines from the MC and it pulls away from the brake booster Remove copper bolts.. then the circlip at the back of the MC and the piston 1 slides out.. Turn upside down and quick tap on a desk and 2 will come out.. Lube parts appropriately and check for wear Install new pistons in rebuild kit.. Bleed and you're away! Downloaded the TSRM app and followed the instructions took all of about 10 minutes really Quote Link to comment Share on other sites More sharing options...
rob_sri Posted November 28, 2016 Author Share Posted November 28, 2016 OEM Rebuild kit from ICP was about £75 Quote Link to comment Share on other sites More sharing options...
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