Ok so I had a stuck piston tried everything to get it working just couldn't I suspect its very "gummed up". Anyway, a brake bleed/fluid replacement was long overdue (I'm sure why the piston is gummed up) so I decided I'll just remove the pistons can clean out any gunk stuck in there. One of them I just pushed out using the brake lever and the pressure of brake fluid--the other one it appears you can remove using some sort of tool (see picture). I know you can also force it out using water with the brake bleed syringe but it looks like you can remove one side of the caliper so you can just push it out (see picture). Is there a special tool for that?
![Image]()
What tool do I use to remove the piston from XTR calipers?
Aceman
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Ok so I had a stuck piston tried everything to get it working just couldn't I suspect its very "gummed up". Anyway, a brake bleed/fluid replacement was long overdue (I'm sure why the piston is gummed up) so I decided I'll just remove the pistons can clean out any gunk stuck in there. One of them I just pushed out using the brake lever and the pressure of brake fluid--the other one it appears you can remove using some sort of tool (see picture). I know you can also force it out using water with the brake bleed syringe but it looks like you can remove one side of the caliper so you can just push it out (see picture). Is there a special tool for that?
![Image]()
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19,174 Posts
Folded rag in pad space and compressed air in brake line port.
Exercise caution. Wear protective eye wear.
Exercise caution. Wear protective eye wear.
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13,018 Posts
a 5 point torx bit...
Really? I didn't think that was a torx--I mean I have them just nowhere near that big!
What size it is? I'm looking at a set at the biggest is T40
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19,174 Posts
It is not a Torx.
Torx are 6 points, that is 5 points
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13,018 Posts
torx were only 6 point till like 1990 or so. they've also had 5 points since then...
that doesn't work too much air escaped from the space where the pad is already out.
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390 Posts
Apple uses "pentalobe" screws on some of their phones, basically similar as 5 point torx. Likely it is not going to be "cost effective" to try and find proper key to open that cap. Likely you could use big enough flat head screw driver or fabricate correct width tool from flat iron bar or used metal file or something similar to unscrew that cap.
Compressed air would be my choice too to try pop that stuck piston out(with the other piston installed), but if the piston is stuck tightly, some other means might be needed. Using too much external force on the piston itself might be bad choice, as those are ceramic and tend to break easily...
Compressed air would be my choice too to try pop that stuck piston out(with the other piston installed), but if the piston is stuck tightly, some other means might be needed. Using too much external force on the piston itself might be bad choice, as those are ceramic and tend to break easily...
1 - 11 of 11 Posts
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