Abstract: A truck mounted brake assembly wherein a brake cylinder assembly and slack adjuster each have a first end connected to a first brake beam, and a second end coupled to each other via a first lever pivotally attached to a second brake beam, such that movement of the brake beams relative to each other applies and releases the brakes. The slack adjuster can have a trigger operating slack adjustment, and a rod member can have one end connected to the first brake beam and an opposite end coupled to the trigger via a second lever pivotally attached to the second brake beam, such that movement of the brake beams relative to each other causes the rod member to operate the trigger. The trigger can be connected to the second lever in a length adjustable manner, and a piston travel indicator can be provided adjacent the brake cylinder assembly.