spring brake chamber
A dual-circuit brake booster integrates two independent vacuum chambers within a single steel housing. The primary and secondary diaphragm diameters typically range from 250 to 300 mm. Each circuit provides an independent force multiplication ratio between 4:1 and 6:1. The system utilizes two separate control valves rated for operational pressures up to 120 bar. The chambers are constructed from high-strength stainless steel with a 2 mm thickness. The independent output rods have a 50 mm linear travel with a tolerance of ±0.1 mm. This design ensures complete isolation of front and rear circuits in case of a leak. The assembly endures over 1 million operational cycles in durability testing.
The internal structure features two synthetic rubber diaphragms reinforced with fabric fibers. An electronic valve regulator EVP often modulates the boost ratio based on vehicle speed. Required vacuum pressure is a minimum of 0.9 bar absolute in both chambers. System response time is enhanced to under 80 milliseconds for emergency braking. An automatic fault detection system identifies a 0.2 bar pressure drop within 0.5 seconds. A central locking mechanism prevents asynchronous operation of the two circuits. Total assembly weight varies between 5.5 and 8 kilograms. This booster is certified
