A bootstrap system that is used for motor vehicle disc brake's braking piston

The utility model relates to a bootstrap system that is used for motor vehicle disc brake's braking piston, include: the braking piston, columniform brakies piston cylinder (13) for accept the brakingpiston with ability axial displacement's mode in casing (4), with the sealing ring of mode supporting in casing (4) that can not axial displacement, this sealing ring is flexibly pressed from both sides tightly between columniform braking piston wall portion and the notch of brakeing piston cylinder (13). In order to improve the NVH characteristic under the condition of the interference noise avoiding motor vehicle disc brake, guide part (15) that are provided with reversiblely pretension flexibly tightly press from both sides between braking piston cylinder (13) and braking piston wall portion, and should guide the part to be supported on casing (4) to to brake the piston with suitable orientation and the coupling of braking piston cylinder (13). 本实用新型涉及种用于机动车盘式制动器的制动活塞的引导系统，包括：制动活塞；圆柱形的制动活塞缸筒(13)，用于以能轴向移动的方式在壳体