K181111
Spring Brake (S-Cam)
Bendix

In heavy truck air brake systems, the parking brake actuation assembly relies on a robust double diaphragm chamber to hold and release the braking forces in varied conditions. This unit is engineered with precise port geometry to fit common installation footprints, featuring a 45 deg port angle and a 150 deg clamp angle that optimize routing and mounting clearance in restricted or crowded chassis areas. A 1.50 inch stud length and 5/8-18 inch stud thread provide strong, vibration-resistant attachment to actuator levers, while the 3/8-18 inch service and parking port threads offer flexible plumbing options for diagnostic and control circuits. The stroke length of 3 inches governs push rod travel, delivering predictable engagement and release at the drum and S cam assembly, improving brake response consistency. Operating temperature compatibility from -40 to +79 C ensures reliable performance from arctic climates to hot desert conditions, and the double diaphragm design contributes to smoother actuation, reduced leakage, and improved reliability during frequent parking brake cycles. VMRS code 013-004-001 anchors this component within the brake assembly family, aiding technicians in sourcing compatible parts. Within its category, this part plays a critical role in maintaining parking brake integrity, fleet uptime, and safety by ensuring consistent engagement pressure and dependable release in varied service environments.