[vikb]

My situation:

- 2014 era XTR trail brakes [M988]
- new hose installed and bled with partially worn pads
- pads got contaminated so replaced them with new pads soon after bleeding
- new pads result in no clearance for rotor and lever bites without any throw

My question is can I reset pistons without removing any oil or since the brakes were bled with the partially worn pads do I need to open the filler port at the lever and then reset pistons so the excess oil can get out of the system?

Thanks in advance for your help.

 

[mikesee]

i think there's always room to push the pistons back in.

 

[Lone Rager]

Reset the pistons and put the bleed block in. Crack the screw at the lever and let out any excess fluid. If you can't reset the pistons far enough to get the bleed block in, crack the screw first.

 

[compengr]

Proper way to do it is to bleed again using a Shimano bleed block. That way you won't have to guess

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[Cleared2land]

^^^ Negative. Why do that?

You don't have to bleed anything. Simply as stated above.

 

[vikb]

Thanks for the replies. I was able to reset the pistons without taking any oil out. Brake works fine in the repair stand. I'll get the bike out for a ride Friday to confirm it's working properly.

 

[compengr]

^^^ Negative. Why do that?

You don't have to bleed anything. Simply as stated above.

Post above must have gone up as I was typing. You could do that, but not knowing OPs level of familiarity with the brake system suggesting the to go through the bleed seemed like the best idea.

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[Lone Rager]

If unfamiliar, there's way more opportunity to run into issues bleeding the brakes than simply letting excess fluid out of the lever, which is a simple and low risk procedure to let out excess fluid.

In replacing pads, I often found that there was excess fluid in the system due to people having bled them without the bleed block. Letting it out was an easy, quick, simple, and low risk solution.