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Rear brake wont build pressure

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Hello im having trouble with my rear brakes I forgot to tighten the banjo bolt down and it backed itself out but I didnt realize it until I had to use my rear brake anyways now i have no pressure and im pretty sure its the brake line because m/c pushes fluid but line doesnt. can bleeding fix this or do i need a new line. it makes noise like theirs fluid inside but very little fluid comes out

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Very likely that there's air in the line
Try bleeding it and go from there

Got any tips? Ive tried all I know how to do.

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For bleeding the brakes? It's a pretty straight forward process just open the bleed nut on the calliper, open the master cylinder and fill with brake fluid and pump the brake until no air comes out (close the nut after every pump when you lift the brake back up so no air gets back in)
If you just simply can't get it to pump I would guess either a blockage in the hose or a bad master cylinder

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