BMW R75 R90 ATE brake caliper repair kit 38mm upgraded piston. This kit includes 1x upgrade piston, 1x dust seal and 1x oil seal for one caliper. This upgrade piston is made from anodised aluminium and will not rust and seize like the original is prone to do.
Caliper repair kit with a single 38mm diameter piston, for bikes built before 09/1975. 40mm calipers have'40' stamped on the outside of the caliper body. If your caliper is unstamped it will almost certainly have a 38mm diameter piston, but please measure your piston diameter before ordering!
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