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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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    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
    Apr 30 '20 at 12:15
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    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. Apr 30 '20 at 12:32
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    Make sure you properly re-fill the fluid according to the manufacturers specified procedure. Apr 30 '20 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.
    – Vladimir F
    Apr 30 '20 at 16:21
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    Does this answer your question? How do I change my disc brake pads? May 2 '20 at 1:20
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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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