What is the correct way to bleed a PFM brake caliper?
A great deal of thought and design led to us producing a caliper with two bleed nipples. This design allows a free path for any air or fluid to exit the caliper with the bleed nipples vertical. The easiest way to fill the calipers with fluid for the first time is to mount them on the discs in a upright position (hold them onto the discs with elastic bands) then connect clear plastic hose onto both bleed nipples of the caliper being bled, that is long enough to clip onto the handlebar. With the reservoir filled but the top not fitted, undo the inner bleed nipple. No pumping of the lever is necessary, as the fluid will feed by gravity into the caliper. When only clear fluid is coming into the clear plastic hose from the bleed nipple, close it and repeat with the outer bleed nipple. Repeat this process for other caliper, and then mount the calipers to the fork leg. If a firm lever cannot be obtained immediately it may be necessary to repeat the process.
