Disk parking and service brake having servo action on parking brake only

Claim 2

A disk brake assembly adapted to brake the rotation of a brake rotor, said brake assembly comprising a brake shoe positioned on one side of the rotor, first actuating means positioned on the one side of the rotor for operating said brake shoe, second actuating means positioned on the one side of the rotor for operating said brake shoe, and means for exerting a self-energizing force upon said brake shoe only when said brake shoe is operated by said second actuating means.

Claim 3

A brake assembly as set forth in claim 1 wherein the last named means comprises means interposed between the first actuating means and the brake shoe.

Claim 4

A brake assembly as set forth in claim 2 wherein the first actuating means includes a hydraulically operated piston and the second actuating means comprises a mechanically actuated member.

Claim 5

A brake assembly as set forth in claim 1 wherein the first actuating means comprises a hydraulically operated piston and the second actuating means includes a mechanically actuated member.

Claim 6

A brake assembly as set forth in claim 4 further including means for precluding reverse movement of the hydraulically operated piston when a force is applied thereto.

Claim 7

A brake assembly as set forth in claim 1 wherein the last named means comprises means defining cooperating surfaces inclined with respect to the frictional lining surface of the brake shoe and interposed between the first actuating means and said brake shoe.

Claim 8

A disk brake assembly as set forth in claim 6 wherein the first actuating means comprises a hydraulically operated piston and the second actuating means includes a mechanically actuated member, and further including means for preventing reverse movement of said piston when a force is applied thereto through the cooperating inclined surfaces.

Claim 9

In a disk brake assembly including a rotor supported for rotation about an axis and having braking surfaces, a brake pad having a frictional lining juxtaposed to said rotor brake surfaces and a backing plate, a caliper assembly associated with said brake pad and defining a cylinder bore extending substantially perpendicular to said rotor braking surface, a piston slidably supported in said cylinder bore, a member interposed between said brake pad backing plate and said piston and engaged by said piston, said member and said backing plate having related, angularly disposed surfaces, a roller interposed between said surfaces of said member and said backing plate, means for holding said member against rotation, an actuating pin slidably supported by said caliper and engaged with said backing plate for actuating said brake pad, and means for providing for transverse movement between said actuating pin and said backing plate for effecting axial movement between said backing plate and said member upon engagement of said brake pad with said rotor braking surface for effecting a servo action on said brake pad when actuated by said actuating pin.

Claim 10

In a disk brake assembly including a rotor supported for rotation about an axis and having braking surfaces, a brake pad having a frictional lining juxtaposed to said rotor brake surfaces and a backing plate, a caliper assembly associated with said brake pad and defining a cylinder bore extending substantially perpendicular to said rotor braking surface, a piston slidably supported in said cylinder bore, a member interposed between said brake pad backing plate and said piston and engaged by said piston, said member and said backing plate having related, angularly disposed surfaces, a roller interposed between said surfaces of said member and said backing plate, means for holding said member against rotation, an actuating pin slidably supported by said caliper and engaged with said backing plate for actuating said brake pad, and means for providing for transverse movement between said actuating pin and said backing plate for effecting axial movement between said backing plate and said member upon engagement of said brake pad with said rotor braking surface for effecting a servo action on said brake pad when actuated by said actuating pin.

Claim 11

A sliding caliper type disk brake assembly for braking the rotation of an associated rotor, said brake assembly comprising a caliper adapted to be supported for sliding movement in a direction parallel to the axis of rotation of the associated rotor, a first brake shoe supported for movement relative to said caliper and adapted to be positioned on one side of the rotor, a second brake shoe fixed against movement relative to said caliper and adapted to be positioned on the other side of the rotor, first actuating means for moving said first brake shoe relative to said caliper and into engagement with the associated rotor braking surface and for creating a reactive force upon said caliper for sliding said caliper relative to the rotor to bring said second brake shoe into engagement with the associated rotor braking surface, second actuating means for moving said first brake shoe relative to said caliper into engagement with the associated rotor braking surface and for creating a reactive force upon said caliper for sliding said caliper relative to the rotor to bring said second brake shoe into engagement with the associated rotor braking surface, and means for exerting a self-energizing force upon said first brake shoe only when saId first shoe is operated by said second actuating means.

Claim 12

A sliding caliper type disk brake assembly for braking the rotation of an associated rotor, said brake assembly comprising a caliper adapted to be supported for sliding movement in a direction parallel to the axis of rotation of the associated rotor, a first brake shoe supported for movement relative to said caliper and adapted to be positioned on one side of the rotor, a second brake shoe fixed against movement relative to said caliper and adapted to be positioned on the other side of the rotor, first actuating means for moving said first brake shoe relative to said caliper and into engagement with the associated rotor braking surface and for creating a reactive force upon said caliper for sliding said caliper relative to the rotor to bring said second brake shoe into engagement with the associated rotor braking surface, second actuating means for moving said first brake shoe relative to said caliper into engagement with the associated rotor braking surface and for creating a reactive force upon said caliper for sliding said caliper relative to the rotor to bring said second brake shoe into engagement with the associated rotor braking surface, and means for exerting a self-energizing force upon said first brake shoe only when saId first shoe is operated by said second actuating means.

Claim 13

A sliding caliper type disk brake assembly as set forth in claim 9 wherein the first actuating means comprises a hydraulically operated piston and the second actuating means comprises a mechanically actuated member.

Claim 14

A sliding caliper type disk brake assembly as set forth in claim 10 further including means for precluding reverse movement of the hydraulically operated piston when a force is applied thereto.