Effect of lateral run-out on calliper drag in automotive disc brakes

Efficiency of an automotive disc brake system is affected by several factors such as lateral run out (LRO), caliper housing stiffness, lining compressibility, seal/groove design, brake fluid, and pad material. A minor deviation in any of these factors may lead to problems like brake noise, vibration and off-brake caliper drag in the brake system. This paper presents an experimental study of the effect of LRO on calliper drag by measuring drag with respect to LRO for different types of callipers at varied speeds. This study is important because in automotive industry, different methods are used for testing different types of calipers with different LRO values. Results indicate that the effect of increasing LRO on off-brake caliper drag is caliper dependent