Caliper Parts. Material: Reinforced polyester resin, rubber Brake medium compatibility: Mineral Oil Brake compatibility: Service parts for shimano SLX XT XTR hydraulic disc brake calipers Weight weighed: 10.6g Color: Black Caliper Piston Kits Include: 2x caliper pistons OD0.862 x H0.3465inch(OD21.9 x H8.8mm); 2x square profile piston seals ID0.854 x 0.086inch; 2x sealing rings for brake caliper 0.236 x 0.059inch(6 x 1.5mm); 2x sealing rings for line connection 0.2559 x 0.0394inch(6.5 x 1mm). TIPS: ONLY APPLICABLE TO MINERAL OIL, NOT APPLICABLE TO DOT OIL OR OTHER BRAKE FLUIDS,CLEAN THE CERAMIC RESIDUE BEFORE INSTALLATION!！
Corey Frayer (comprador verificado) –
Great, especially during parts shortage
I used these off-label to replace a broken ceramic piston in a BR RS505. The flat ring and piston fit perfectly. The o-ring for the caliper fluid channel is too small for the 505, but the outer rubber washer does fit on the bolt.
Christopher (comprador verificado) –
Don’t work for real mountain biking
I got these to replace a broken ceramic piston on my XT BR-M8000 brake caliper. The original Shimano piston is ceramic, and these pistons appear to be made from melamine. I cleaned and bled everything multiple times but could never get any stopping power, and had horrible screeching from the brakes. I think the original pistons are ceramic for a reason. I finally replaced the whole caliper For real mountain biking just replace the caliper, it’s not much more expensive and it’s not meant to be user serviceable.
Avery (comprador verificado) –
Works great on R9170 calipers!
The pistons fit perfectly inside the R9170 existing seals. I did not try to replace the original seals with the included ones so I can’t vouch for the fitment but overall I am super happy with the product and ease of installation!
Bre (comprador verificado) –
Not for BR-RX400 grx
Purchased a while back, didn’t use them and thought I’d try them on a new caliper. Just wanted to post for anyone looking for a set for BR-RX400 grx. They are to big for the housing of the piston and piston seals.
KimF (comprador verificado) –
This rebuild kit works with Shimano XTR 9020
The first piece of information I wanted to share is that I used these Pistons on a Shimano XTR 9020 . There was a previous review that said it wouldn’t fit, I had no issues with mine. Putting them on the XDR 9020 was a little bit different than the video shown on this ad page because the 9020 has a uni-body construction. But with that said, using the air pressure hose to blow out the Pistons worked like a charm. Getting the O-rings in was a little bit of a struggle, but with a litte patience it can be done.
Amazon Customer (comprador verificado) –
Seals good, o-rings no.
The seals fit fine. O-rings not so much.
Oscar (comprador verificado) –
Worked Perfectly for GRX 810 (BR-RX810) Disc Calipers
I needed to replace the pistons in my GRX disc caliper as one cracked after pushing my brakes past their limit on a very tough (read dumb) ride. The caliper disassembly and rebuild was straightforward with the pistons and piston seals. I did not use the kit’s smaller o-rings. After a couple of fluid bleeds, the brakes pumped up nicely and my original lever feel has been restored. I do not see any leaks or reason to believe they will start leaking.Although my measurements show the EXNAVI pistons as 0.01mm larger than the OEM version, be mindful that 0.01 is within the error of this type of measurement tool and technique. I run a machine shop and have done a ton of mechanical repairs in all sorts of machines over the years and had no qualms about dropping these replacement pistons in. Although I can’t specifically pinpoint the exact material these are made of, it does appear to be a ceramic. I would even say that the surface finish appears to be smoother than the OEM pistons – perhaps that’s a good thing?Overall, If I ever need to repair another caliper, I would have no hesitation to buy this kit again.
Kevin (comprador verificado) –
Replacement Ceramic piston for Shimano XT BR-M8000 Calipers
Hey,So I broke my piston, and it got jammed in the caliper. This kit provided 2 new replacement calipers, and they are perfect!There is 1 “O” ring missing for my brake calipers, so don’t throw your rubber rings away until you complete the rebuild.Great kit! and now they work great!Thanks