51 BRAKES ADJUSTMENT OF PARKING BRAKE Before adjusting parking brake cable slackness, confirm the following conditions. a. Brake bleeding should be completed. (i.e. no air trapped in the system). b. Confirm pedal travel by depressing the brake pedal for few times. c. Check the lining condition of the rear brakes. 1. Put chocks on front wheels. 2. Jack up the rear axle 3. Loosen lock nut. Pull parking brake lever up by two notches. 4. Tighten spher ical nut till rear wheels star t jamming and cannot be rotated. 5. Release the parking brake and ensure that wheels are rotating freely. Hold the spherical nut in this position and tighten lock nut, to specified torque. 6. Lower down the rear axle. 7. Remove chock from front wheels. 8. When correctly set, the lever should be against its stop on the trailing shoe with minimum slack in the hand brake cable. INSPECTION OF PARKING BRAKE : Pull the parking brake lever at its centre by 20 kg force, with this force the travel should not exceed 5th notch position. Fig. Check both the wheels are locked at this condition and release the lever (i.e. take it to the 'Zero'th notch) and check for free rolling of the wheels. Both rear wheels should be free and there should not be rear brake dragging. For counting the notches easily, listen to the click sound from the ratchet while pulling the parking brake lever without pressing the button. A click sound pertaining to each notch movement. BRAKE PEDAL HEIGHT ADJUSTMENT Fig.53 The push rod of the vacuum booster serves as the brake pedal stopper when the pedal is fully released. The brake pedal height adjustment should be performed as below: 1. Make sure that pedal is fully returned by the return spring. 2. Loosen nut on the adjusting eccentric pin of the lever Fig. 52 - Parking brake linkage adjustment 1. Lock Nut 2. Spherical nut Fig. 53 - Brake pedal height adjustment. 3. Turn the eccentric pin to get the required pedal height in line with the clutch pedal. 4. After adjusting pedal height, brake light switch to be set as per Fig. 38 & ensure that switch does not obstruct pedal return to its fully released position. 5. Operate the brake pedal a few times to ensure proper brake application. CAUTION: After rear brake drum is machined to repair size of 283.5 mm dia the parking brake will become ineffective, when usable stock of brake lining thickness reduces to 0.7 mm and below. Hence change the brake linings with new ones as soon as the lining thickness reduces to 0.7 mm.
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