New Aftermarket 13mm Front Brake Master Cylinder Rebuild Piston For All K75/K100 2Valve Non-ABS Bikes & All Airheads With 13mm Master Cylinders

New aftermarket 13mm piston for rebuilding the front brake master cylinder on all K75/K100 2 valve non-ABS bikes. Also fits R45, R65, R80 and R100 bikes that have a 13mm master cylinder. if you have an Airhead please check that your master cylinder is marked with a "13" (it is usually directly to the left of the resevior on the top of the master cylinder) Don't let your dealer tell you that you need to buy a complete master cylinder when yours leaks, use this piston to rebuild yours!! BMW gets $80 for this same rebuild kit, save here!