Diaphragm Repair Kit

The Diaphragm Repair Kit by CONROY BLEEDERS (model CPC-033) is a complete tire pressure relief valve restoration assembly designed for mechanics and automotive technicians who maintain and rebuild pneumatic braking and suspension systems. This compact kit addresses diaphragm degradation—one of the most common failure modes in pressure-regulating valves—by supplying OEM-quality replacement components that restore proper valve function and system reliability without requiring full valve replacement.

The kit includes a precision-engineered diaphragm, stainless steel springs, and pre-sized hose fittings that work together to re-establish the seal integrity and response curve of the relief valve. Over time, diaphragm material hardens and cracks due to heat cycling, ozone exposure, and pressure fluctuation, causing slow air leaks or erratic pressure regulation. This repair kit restores the diaphragm's elasticity and sealing geometry, allowing the valve to maintain crisp pressure thresholds across the entire operating range. The included spring maintains consistent biasing force, while hose ends ensure leak-free connections to brake lines and pneumatic circuits.

Technicians working on medium-duty trucks, trailers, air suspension platforms, and vintage brake systems benefit most from this kit, as these applications rely heavily on pneumatic pressure relief valves for safety-critical load management and air supply regulation. Installation requires only basic hand tools and a clean, dry work surface; no special equipment is needed. The lightweight, compact design (4.15 x 0.7 x 4.85 inches, 0.06 lbs) fits easily into toolboxes and service kits, making it an essential inventory item for shops that perform routine air system maintenance, diagnostics, and rebuild work.