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Shimano Road Disc Brake Won't Take Fluid - HELP!

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Shimano Road Disc Brake Won't Take Fluid - HELP!

Old 03-26-20, 04:25 AM
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Shimano Road Disc Brake Won't Take Fluid - HELP!

I have filled and bled Shimano road discs several times without problems. It's easy . . . until it isn't. Can anyone help with this problem?

I replaced the rear caliper on my Shimano Ultegra R8070 disc brakes. I mounted the bleed cup at the bar and I opened the bleed valve on the caliper. I attached the full syringe. But when I try to push the fluid into the caliper, it acts as if there's a blockage. No matter how hard I push, the fluid doesn't flow into the caliper. I loosened the lever uptake adjustment at the handlebar, but still the fluid won't flow. Any ideas on how to fix the problem?
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