Anyone know anything about disc brakes?

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ILb in reply to @ectoplasmosis

Will get hold of some mineral oil and try again.

I can push one in no problem, causing the other one to come out further. Then have no way of keeping the first in place whilst fighting the other one back in.

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grams in reply to @ILb

Try slacking off the cable and ensuring the master cylinder is all the way out. There's a valve that needs to open to allow fluid to return to the reservoir. When it's open that path should have lower resistance than pushing out the other piston.

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ILb in reply to @grams

Releasing the cable and master cylinder was an immediate game changer.

Thanks all.

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