With more than 11 million units sold worldwide, the BPW drum brake is now the embodiment of a reliable brake for towed vehicles. It sets new standards for lifecycle costs thanks to its robust construction and ease of servicing. Our designers have succeeded in optimising the classic drum brake further, resulting in the ECO Drum. The result: A considerable weight reduction, improved sealing and lower wear.
The force of the brake cylinder below (1) acts via the slack adjuster (2) and causes the brake camshaft (3) to rotate. The S-cam (4) forces the brake shoes (5) apart, pressing them against the inside of the brake drum (7). When the brake is released, the brake camshaft (3) rotates the S-cam (4) back to its neutral position. The brake shoes (5) are returned to their initial position by tension springs (6).
WEAR and DAMAGE Characteristics on Friction Brakes
DRUM Brake - click on image to download