MASTER CYLINDER MUST BE PRIMED BEFORE USE.

BLEEDING BRAKES IS A TRICKY JOB AND THERE CAN BE A LOT OF REASONS FOR A MASTER CYLINDER NOT BLEEDING.

THIS IS VERY COMMON WHEN CHANGING A MASTER CYLINDER WHETHER IT IS A NEW ONE OR USED ONE.

IF WHEN BLEEDING THE NEW CYLINDER IT DOES NOT BLEED, IT WILL NOT BE THE FAULT THE BRAND NEW MASTER CYLINDER BUT ANOTHER ISSUE.