A Heavy-Duty Trailer Air Long Stroke Brake Chamber is a critical actuator component in a commercial vehicle's air brake system. Its primary function is to convert compressed air pressure into mechanical force to apply the vehicle's foundation brakes.
When the driver presses the brake pedal, compressed air fills the chamber, pushing against a flexible diaphragm. This diaphragm moves a push rod, which is directly connected to the brake camshaft or slack adjuster. The push rod's stroke then mechanically rotates the camshaft (or moves a wedge), forcing the brake shoes against the drum (or pads against the rotor), creating the friction needed to slow or stop the vehicle.
The "Long Stroke" designation is a key feature. Compared to standard brake chambers, long stroke models have a longer allowable push rod travel. This design provides a greater margin of safety by compensating for normal brake lining wear and ensuring sufficient braking force is maintained even as the brakes wear down. They are essential for maintaining compliance with braking regulations and are a standard feature on modern heavy-duty trailers and trucks.
| Feature | Specification / Description |
|---|---|
| Product Type | Long Stroke Air Brake Chamber / Actuator |
| Application | Heavy-Duty Trailers, Trucks, Buses, and Commercial Vehicles |
| Mounting Style | Bolted Clamp Band (Standardized for interchangeability) |
| Size / Type | Common Sizes: Type 30, Type 24/30 (e.g., 3030, 2430) |
| Effective Area | Varies by size (e.g., Type 30: 30 sq. in. diaphragm area) |
| Maximum Stroke | Typically 2.75 inches (vs. 2.5" for standard chambers) |
| Maximum Pressure | 120 psi (830 kPa) - Standard for air brake systems |
| Standard Mounting | Compliant with SAE J1812 and FMVSS 121 standards |
| Diaphragm Material | Heavy-Duty, Oil-Resistant Rubber or Synthetic Compound |
| Housing Material | Pressed Steel or Aluminum, Corrosion-Resistant |
| Spring | High-Tensile Steel Return Spring |
| Push Rod Thread | Standardized for clevis/pin attachment to the slack adjuster |
| Key Features | - Long Stroke Design: Provides a safety margin for brake wear, ensuring consistent performance. - Heavy-Duty Construction: Built to withstand harsh operating environments and high cycle counts. - Reliable Sealing: Prevents air leaks for efficient system operation. - Safety Compliance: Helps maintain braking force as required by transportation regulations. - Interchangeability: Standardized dimensions for easy replacement and service. |
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