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19th December 2007 at 5:23 pm
#6825
Laudanum
Participant
Strange things master cylinders, they can work fine and pack up when you change brake pads etc, I assume there is a small amount of pressure left that pushes against the seal but when it is released the seal fails.
Probably why the cure for spongy brakes is to pump it until you get a lever then cable tie it to the bars overnight.