5 THINGS YOU NEED TO KNOW

Motorcycle News (UK) - - Garage -

1 CALIPER PIS­TON

These sit in bores held in place by a rub­ber seal re­cessed into a groove in the caliper body. As the pads wear, more of the pistons’ sur­face is ex­posed to cor­ro­sion, which can cause them to stick. They should only be cleaned with ded­i­cated brake cleaner – other prod­ucts like WD-40 can make the seals swell.

2 BRAKE PADS

Or­ganic pads are for small-ca­pac­ity bikes, and use a cock­tail of aramid fi­bres, rub­ber and cop­per strands. Sin­tered pads have bet­ter wet-weather per­for­mance. They have a stronger ini­tial bite, don’t take long to bed in and last longer than or­ganic pads. The ma­te­rial is a mix of cop­per, tin, carbon and Mul­lite (a high-per­for­mance ce­ramic ma­te­rial).

3 BANJO UNION

A hol­low per­fo­rated bolt passes through a spher­i­cal union car­ry­ing the hy­draulic fluid into the caliper body. The union has a long neck which looks sim­i­lar to a banjo. New crush wash­ers should be used each time they are fit­ted to avoid leaks.

4 BLEED NIP­PLE

A threaded screw mounted into the top of the caliper that al­lows any build-up of air to be ‘bled’ out of the sys­tem af­ter servicing or dis­man­tling. As air com­presses its pres­ence means that hy­draulic pres­sure is lost while it’s squeezed, which re­duces ul­ti­mate brak­ing power and af­fects feel. 5

RA­DIAL MOUNTS

More rigid than ax­ial set-ups be­cause the bolts are per­pen­dic­u­lar to the wheel’s ro­ta­tion and not par­al­lel to the axle, cut­ting down on de­flec­tion. They can also be made from a sin­gle block of metal and run larger pistons. They can ac­com­mo­date larger discs on race bikes eas­ily too.

Much more use­ful than the mu­si­cal banjo!

Keep pistons and seals clean to en­sure top stop­ping power

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