| 摘要 |
A variable ratio lever mechanism for a power booster assisted motor vehicle braking system includes a variable ratio fulcrum mechanism which normally establishes a first pivot point providing the relatively low mechanical advantage needed for booster assisted actuation of the brake system. A force sensitive locking mechanism allows the first pivot point to break away when the reaction force acting thereon exceeds that associated with booster assisted break actuation and establishes a second pivot point of relatively higher mechanical advantage enabling the vehicle operator to actuate the break system independent of the booster assist.
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