garrett Posted August 9, 2015 Report Share Posted August 9, 2015 Hi Folks The front brakes on my Evo have little feel, and can be grabby. Last year the front brake would stick on then slowly release and eventually the brakes would just lock after brake application. I replaced the rubber plunger in the master cylinder and this solved the stuck brake problem, but the brakes still don't have a progressive feel at all. Now the front brake is beginning to exhibit the stickiness again. I used Dot 4 fluid as called for. Has anyone had similar problems? Has anyone retro fitted another brake master on the bike? Thanks Garrett Quote Link to comment Share on other sites More sharing options...
tomevans Posted August 9, 2015 Report Share Posted August 9, 2015 I have retrofitted ktm and husqvarna brembo I cylinders in the past with varying success. The first one I did is perfect, great feel, smooth and lots more power than the formula set it replaced. This requires a hose change to one with 10mm banjos on both ends and is expensive to buy the master cylinder new but they do come up cheap on eBay from time to time Quote Link to comment Share on other sites More sharing options...
worldtrialchamp Posted August 9, 2015 Report Share Posted August 9, 2015 sounds like grit in the system, around the caliper pistons/seals Quote Link to comment Share on other sites More sharing options...
steve_earle Posted August 9, 2015 Report Share Posted August 9, 2015 Calipers need stripping often, There is always a build up under the front lip of the seals that most people overlook as it can't be seen. You can remove the pistons and it will look spotless but take a hooked pick to the under side of the seal lip and all sorts of crud will come out. The Grimeca calipers have very soft anodising on the pistons and can wear through and create a groove very quickly, The Ajp ones are much better and last for years in comparison. Quote Link to comment Share on other sites More sharing options...
garrett Posted August 9, 2015 Author Report Share Posted August 9, 2015 I did remove the caliper and used compressed air and brake cleaner but I'll take it apart and give it a good cleaning. Thanks for the replies. Garrett Quote Link to comment Share on other sites More sharing options...
dan williams Posted August 10, 2015 Report Share Posted August 10, 2015 I had a sticking front caliper that I rebuilt a few days ago. First time out today and it's all good. The rebuild kit came with pistons and seals. The new pistons measured ~0.003" smaller than the originals. Still snug on the seals. Felt fine today. It was easier than I thought it would be. Quote Link to comment Share on other sites More sharing options...
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