QW315-32 Pneumatic Drum Brake

QW315-32 pneumatic drum brake

The QW315-32 is a pneumatic drum brake belonging to the QW series, which is recognized as a "century-old classic" in industrial braking. It is designed for heavy-duty applications, particularly in the commercial vehicle and heavy transport sectors, where it is valued for its durability and cost-effectiveness.

The model number breakdown is as follows:

QW: The series designation for this specific line of pneumatic drum brakes.

315: The Brake Drum Diameter of 315 mm.

32: Typically refers to the Brake Shoe Width of 32 mm or a specific internal configuration variant within the QW315 family.

💡 Key Features & Characteristics

Cost-Effective Durability:
The QW series is renowned for its low lifecycle cost. It offers a maintenance cycle of up to 100,000 km, and the replacement cost for a single brake shoe is significantly lower (less than one-third) than that of equivalent disc brake systems.

Advanced Pneumatic Actuation:

Self-Energizing Structure: The QW series has evolved from simple leading-trailing shoe designs to bi-directional self-energizing structures. This mechanical design uses the rotation of the drum to increase the braking force, providing high efficiency.

Air Operation: It operates using compressed air (typically 0.5 ~ 0.7 MPa), making it the standard choice for vehicles and machinery equipped with air brake systems.

Modern Electronics Integration:
Despite being a mechanical design, the modern QW series is "electronic-ready." Newer models can be integrated with wear sensors and temperature monitoring modules, allowing them to communicate with the vehicle's CAN bus system for real-time diagnostics.

Market Dominance:
This series maintains a significant market share (approx. 65%) in the commercial vehicle sector due to its proven reliability and ability to handle heavy loads effectively.

🏭 Typical Applications

The QW315-32 is primarily used in transportation and heavy mobility:

Commercial Vehicles: Heavy-duty trucks, buses, and trailers (as service or parking brakes).

Specialized Transport: Low-speed heavy transporters and industrial tractors.

Rail & Transit: Certain urban rail or light rail applications where pneumatic braking is standard.

📋 General Technical Specifications

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Note: The QW series represents a "mechanical body, electronic application" philosophy. While the core mechanism is robust and traditional, ensure you check if your specific unit requires wear sensors or specific air chamber linkages (S-cam or wedge type) when replacing an existing unit, as these can vary by vehicle manufacturer.

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