Combination service and park fluid operated brake

Claim 1

A combination service and park brake comprising: a cylinder including two housing members and a ringlike piece located between said housing members and rigidly and detachably secured therewith to form an internal wall intermediate the length of said cylinder, said cylinder also having an end wall at the end of one of said chambers; a parking brake piston slideable in one of said chambers and a first rod extending from said brake piston and sealingly through said internal wall; said parking brake piston having a second rod extending from its side opposite said first rod; a said second rod being slideably supported in said end wall whereby said parking brake piston is supported at each end, fluid passage means extending into said one of said chambers and located adjacent said internal wall; for conducting pressure fluid to one side of said parking brake piston to urge the parking brake piston in one direction toward a brake released position; Belleville spring means in said one chamber and surrounding said second rod and located on the opposite side of said parking brake piston to urge said piston in the other direction to a brake engaged position; a service brake piston means slideable in the other chamber and engageable by said extending rod of said parking brake piston when said spring means moves said parking brake piston sufficiently towards said internal wall; a brake engaging member at the end of said cylinder and mounted on said service brake piston means; second fluid passage means extending into said other chamber and adjacent said internal wall for admitting fluid pressure into said other chamber to cause said service brake piston means and said member to move into brake engaging position.