Brake fluid coming out of pistons
Just tried to bleed my brakes for the first time and it managed to fail miserably as I now have fluid spewing out of the pistons when the brake lever is depressed. I'm not too sure where I went wrong here as I followed the instructions and used a bleed block etc. Is my brake buggered? has the seal on the piston gone? Any help would be appreciated. Thanks
Sounds like the pistons have popped out or have came out too far. Pushing back the pistons on Shimano brakes require you to use a plastic tyre lever or something similar as the pistons have ceramic tops which can crack easily if forced back by a screwdriver.
Take the pads off and gently push back both pistons until they are fully home, fit spacer and rebleed.
Managed to get the pistons back in by opening the bleed port on the lever. Unfortunately after re bleeding the same problem persists. Every time I press the lever (with the bleed block still in) the fluid drips out of the left piston, I can also hear a slight grinding noise. I'm thinking that dirt might have got in to the seal and wrecked it............ 😥
Looks like the seals have gone or the piston has a crack in it. No option but to buy a full calliper for it as it's a faff changing them and the seals for Shimano. I have two spare XT calipers at home that leak oil because the pistons were pushed back at an angle buggering the seals.
Even better, buy a new brake kit.