Abstract: An anti-rattle spring (11) is mounted in a backing plate (31) of one a pair of opposed backing plate and friction pad assemblies 15 in a generally planar parallel relationship with a rotor (17) engaging friction surfaces and stationary torque support members (19,38). The spring (11) comprises a base portion (21) disposed in a plane which is generally parallel to the planes of the friction surfaces. The base portion (21) is fastened to one of the pads (15) through an elongated boss (39) in backing plate 31 and a corresponding hole (45) in the backing plate (31). The relationship between the elongated hole (45) and boss (39) prevents the anti-rattle spring (11) from rotating on the backing plate 31. The spring (11) also includes a web portion (23) which extends generally perpendicularly from the base portion (21) and a U-shaped resilient cantilevered blade (25) which extends from the web portion (23).