Patent ID: 7909147

Claim:
A brake adapted to be rotationally coupled with a shaft and in communication with a fluid source and a negative pressure source, the brake comprising: a housing defining a chamber; a disc assembly positioned within said chamber including a plurality of stationary discs carried by said housing and a plurality of rotating discs carried by the shaft, said rotatable discs and said stationary discs being positioned for engagement with each other; a piston movable to cause said stationary discs to engage said rotatable discs; a first fluid input in communication with the fluid source and providing a constant supply of fluid to said chamber; a second fluid input in communication with the fluid source and providing fluid when said stationary and said rotating discs are caused to engage; and at least one pin, said second fluid input including an orifice in said housing, said pin being operatively connected to at least one disc in said disc assembly and obstructing said orifice when said rotatable and said stationary discs are not engaged; wherein said disc assembly further includes a primary disc and a secondary disc, said secondary disc abutting said primary disc at the end of said disc assembly, said primary disc having a plurality of pin holes therethrough, said pins being coupled to said secondary disc and extending through said pin holes.