from the caliper 112 an airbrake chamber 24 is located between the two cam levers 268 and 270 the chamber push rod 26 is pivotally connected to a hole 272 near the end of one cam lever 268 a mounting lug 274 on the opposite side of the air brake chamber 24 is pivotally connected to a hole 276 near the end of cam lever 270 a return spring 278 is connected to tabs 280 and 282 on the cam levers 268 and 270 respectively when the air brakes are applied the chamber pushrod 26 is forced outward from the air brake chamber 24 the ends of cam levers 268 and 270 are forced apart braking forces are developed within the disc brake entirely analogously to the operation previously described when the air brakes are released the return spring 278 pulls the cam levers 268 and 270 toward each other to aid in the rapid and complete disengagement of the brake the together directed force on the cam levers 268 and 270 forces the chamber push rod into the air brake chamber 24 fig1 shows an embodiment in which the air brake chamber 24 is supported at the end of a cantilever 284 the use of the cantilever 284 is an adaptation made necessary by the interference of suspension springs and other vehicle parts with an air brake chamber 24 which is closely connected as in those previously described the cantilever 284 is bolted to the mounting flange 174 on the torque plate 12 the air brake chamber 24 is bolted to support flange 286 286a at the unsupported end of.