| 摘要 |
The spot-type floating-caliper disc brake includes at least one guide bolt secured to the brake support member and extending from the support member into an axial bore of the floating caliper adjacent the side of the brake cylinder. A roll-back sealing ring is provided at both ends of the axial bore, one disposed in an annular groove of the floating caliper and the other disposed in an annular groove of the guide bolt. As a result, a pressure chamber is formed around the guide bolt which communicates with the hydraulic brake circuit. With this arrangement, the brake shoe that is connected directly to the floating caliper will be reset to the nominal brake clearance after a braking operation.
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