FRONT BRAKE ASSEMBLY Ventilated disc brakes with single pot caliper of 54 mm piston diameter are provided for front brake. Salient features of disc brakes Caliper assembly consists of a caliper carrier bolted to the knuckle and the body assembly slides on twoguide rod pins used in the carrier (guide rod ‘A’ & ‘B’). Both the sliding guide rod pins are sealed against water and dust by boot guide rod thereby avoiding possible unequal sliding loads caused by dirt, corrosion. Drag of the pads is taken directly by the carrier; consequently, the pins are loaded only by the weight of the caliper body. When the brake pedal is pressed, the hydraulic pressure from Master Cylinder pushes the piston in the caliper pot and with it the in-board pad on to the disc. The caliper body reacts and slides on the guide rod pins to bring the out-board pad into contact with the disc. Thus, the clamping forces on both sides of the disc become equal. When the hydraulic pressure is released, upon release of the brake pedal the sealing ring fitted in the groove of the caliper pot retracts the piston by a small amount, which allows the moving parts to relax sufficiently for the disc pads to retract and remain in close proximity to disc, ready for the next brake application. A. FRONT BRAKE ADJUSTMENT, REMOVAL AND REFITMENT REMOVAL OF CALIPER FROM CARRIER 1. Use a socket and wrench/Pneumatic nut runner to remove the wheel from the axle. Do opposite (or diagonal) loosening of banjo nuts carefully. 2. Remove Banjo bolt from inlet port. 3. Loosen and remove the Bolt- guide rod ‘A’ and Bolt- guide rod ‘B’ from carrier and remove the caliper from the carrier. BRAKE_PETROL 36
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