This is my first time replacing the brake pads of hydraulic brakes. I removed the old ones and the model was Shimano B01S Resin, so I bought the same ones. However, when I have replaced them. They don’t fit into the calipers... well they fit but there is no space for the disc between the pads. I have drained the brakes completely and nothing... Does anyone has an idea about that?

Thanks in advance. I have attached some pics about the issue.

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  • 3
    Did you push the pistons back into the caliper before putting in the new brake pads? You didn't need to drain the fluid.
    – Criggie
    Commented Apr 30, 2020 at 12:15
  • 1
    Ok, problem solve. As @Criggie commented there is no need to drain the fluid and just needed to push back the pistons. Thank you for the advise. Commented Apr 30, 2020 at 12:32
  • 1
    Make sure you properly re-fill the fluid according to the manufacturers specified procedure. Commented Apr 30, 2020 at 13:12
  • Do not push the levers when there is no disc in the calipers. Even when traveling, put some inserts (e.g. old bent credit card) into the calipers to protect them. Commented Apr 30, 2020 at 16:21
  • 1
    Does this answer your question? How do I change my disc brake pads? Commented May 2, 2020 at 1:20

1 Answer 1


I got to fix it just pushing back the pistons with a plastic card. Once they are in their position there was space enough like to set the wheel and the disc brake in it.

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