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... How the Disc Brake works . . . DUST SE^ PISTON PISTON SEAL DISC BLEED SCREW RETRACTOR PIN ASSEMBLY CYLINDER BLOCK CALIPER FRICTION PAD The illustrations on these pages clearly show the construction and operation of a Dunlop disc brake. On the left is shown a front brake wich one of the cylinders cut away exposing the piston and friction pad. Rear brakes are similar in construction but are fitted with a mechanically operated hand brake to meet parking and emergency require ments. The disc is attached to the hub and rotates with the wheel. It is embraced by a caliper which is rigidly fixed to the axle. This caliper carries two hydraulic cylinders each containing a piston and circular pad of friction material. The cylinders are situated one on each side of the disc (see illustration on right hand page) and when the brake pedal is operated they move forward under pressure and apply the pads to the faces of the rotating disc. ...