Patent ID: 7025181

Claim:
In combination with a spring chamber braking mechanism, an automotive disk braking system for an automobile having a preexisting primary braking caliper operative on a brake disk, comprising: A secondary mechanical brake caliper operative on said disk, said secondary caliper having a body attached to an anchor plate mounted to an axle housing, said secondary caliper comprising at least one piston and one piston cylinder, said piston acting on at least one friction pad against a brake rotor, said secondary caliper having a longitudinal bore through the back of each piston cylinder providing for mechanical force input means; A mechanical actuator mounting frame integral to said secondary mechanical brake caliper; A spring chamber for providing parking and fail-safe emergency stopping force attached to said mounting frame having a parking spring with a spring force acting on a actuator plate, said spring being compressed with an increase in an opposing force on said actuator plate, said actuator plate acting to longitudinally retract an actuator rod attached to said actuator plate, said actuator rod having a distal end extending out through an aperture in said spring chamber, said distal end attaching to a actuator linkage; A means of controlling the opposing force against said actuator plate; A lever pivotally attached at a first end to said secondary caliper by means of a fixed position pivotal axis bolt pivotally attached through said mounting frame proximal said secondary caliper body, and pivotally attached at a second end to said actuator linkage; A piston actuator means and coupler extending through said bore between said lever and said piston for transferring said spring force from said lever to said piston; Wherein when said opposing force against said actuator plate is less than said spring force, said parking spring extends said actuator plate, said actuator plate extending said actuator rod longitudinally out of said spring chamber a finite distance, said actuator linkage attached to said actuator rod transferring said spring force to said lever, said lever transferring said spring force to at least one piston actuator means, said piston actuator means transferring said spring force longitudinally to said piston, said piston transferring said spring force to said friction pad, said friction pad transferring said spring force against said brake rotor.