ProVia Double Diaphragm Spring Brake Chamber PRO7120070 Double Diaphragm Air Brake for Heavy Duty Truck Air Brake System

The ProVia ProVia Double‑Diaphragm Spring Brake Chamber (part number PRO7120070) is a replacement component for the air brake and air suspension systems of heavy-duty trucks, buses and semi-trailers. It is built to original equipment specification from quality materials, so it installs on the original mounting points and performs reliably throughout the service life of the vehicle. Key ratings include Max Working Pressure 13 bar, temperature range -40°C ~ +80°C, Stroke 76.2 mm, push-rod length 186 mm, clamp band diameter Ø212 mm.

Combining a service brake diaphragm with a powerful parking spring, the chamber acts as both service brake and parking brake. Compressed air releases the spring for normal driving, and if air pressure is lost the spring applies the parking brake automatically, so the vehicle fails safe. The internal breathing valve keeps moisture out and extends diaphragm life.

Every unit is manufactured to original equipment specification and inspected before it leaves the factory, so it matches the fit, function and durability of the original part. Sealed, vibration-tested construction keeps performance stable in the heat, dust, road salt and constant vibration found on commercial vehicles, and standard interfaces make installation and maintenance straightforward. Spare parts, technical data and fitting advice are available on request.

• Max Working pressure:13 Bar: Temperature range -40°C ~ +80°C.
• Stroke:76.2 Mm: Push-rod length 186 mm, clamp band diameter Ø212 mm.
• Port Thread M16*1.5: Mounting yoke included.
• Combines Service Brake Diaphragm and Parking Spring Brake: Compressed air releases spring parking brake; spring force applies parking brake when air pressure drops.
• ProVia Aftermarket Quality: 1-year warranty, with internal breathing valve IBV for longer service life.

The chamber is fitted to the rear axles of heavy-duty trucks and semi-trailers, where it provides service braking and a fail-safe parking brake. It suits long-haul tractors, tippers, tankers and container chassis that need dependable braking and secure parking on any slope.

Every unit is packed in a neutral export carton with foam protection so that ports, connectors and levers arrive free from damage. OEM cartons and private labels are available on request, and each carton is labelled with the part number for simple warehouse handling. All units are produced to original equipment specification and inspected before shipment; a twelve-month quality warranty and full technical support are provided, and mixed containers can be supplied for distributors and repair workshops. Please contact us for samples, volume discount pricing and confirmed lead times.