Abstract: An improved brake actuator, particularly an improved sealed service chamber, having a flexible tubular seal affixed at one end in the central pushrod opening in sealed relation and surrounding the pushrod in sealed relation in the service chamber housing. The improved seal is generally hourglass-shaped including a midportion which closely circumscribes the pushrod in sealed relation and a free end portion which closely circumscribes the pushrod. A relatively inflexible generally diamond-shaped washer surrounds the midportion of the seal which improves sealing, assures concentricity of the tubular seal, prevents the seal from being pushed through the pushrod opening and provides for easy assembly of the seal and washer assembly in the service chamber around the pushrod. The improved end wall of the service chamber housing includes an offset recessed central portion surrounding the mounting bolts and relatively thin preferably V-shaped contact surfaces which generally circumscribe the recessed portion.

Abstract: An improved mounting bolt for attaching brake actuators to the frame of a vehicle includes a head having outermost portions which contact the service chamber housing, and inner portions which are spaced from the housing. The bolt spreads the force from carrying the brake actuator over a greater area on the service chamber housing and away from the bolt hole. The bolt preferably has a generally rectangular head.

Abstract: A punching device includes a C-frame on which a punch and stripping assembly is upwardly urged by a stripping spring, there being a horizontal retainer pin extending through one of two slots in such assembly and carried in a selected one of a plurality of holes in the frame for selecting the pinch point clearance, namely the clearance between the stripping sleeve and the die.