What is the most common type of brake used in commercial vehicles?

The most common type of brake used in commercial vehicles is the S-cam brake. This brake type utilizes a mechanical lever system where the rotation of an S-cam pushes brake shoes against a drum, providing significant stopping power. The S-cam design is favored for its simplicity, reliability, and effectiveness in handling the heavy loads typical in commercial operations. It is designed to function well under high stress and provides consistent performance across various conditions that commercial vehicles encounter.

S-cam brakes are particularly well-suited for larger vehicles due to their ability to generate substantial friction and, therefore, stopping force. This braking mechanism is also easier to maintain and repair compared to more complex systems, making it a practical choice for fleet operators.

While drum brakes can achieve similar functionality, the S-cam design enhances performance and is predominantly found in heavy-duty applications. Other options like disc brakes and electric brakes have their specific applications, but they are not as widely used across the spectrum of commercial trucking as S-cam brakes.