| 摘要 |
PROBLEM TO BE SOLVED: To provide: a piston seal member having excellent brake gap adjustment characteristics; and a disc brake using the piston seal member.SOLUTION: A disc brake piston seal member 8 is made of a rubber composition composed mainly of ethylene-propylene rubber. Fluororesin particles are dispersed in the rubber composition. A disk brake includes: a cylinder 6 having a cylinder hole 6a; a piston 5 to be inserted into the cylinder hole 6a; and a piston seal member 8 to be fitted in an annular groove 7 formed on an inner circumferential wall of the cylinder hole 6a. |
