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39. Explain how the brake booster is removed and replaced from the braking system?
•Loosely install the booster to dash panel attaching nuts. •Install the inner nylon spacer, the booster push rod, and the bushing on the brake pedal pin. •Tighten the booster to dash panel attaching nuts. •Connect the manifold vacuum hose to the booster. •Install the master cylinder and torque the attaching nuts. Ref: AURLTB003 - Diagnose and repair light vehicle hydraulic braking system pg. 83 40. How is the drum brake manual adjustment done?For adjusting the drum brakes manually, the rear part of the vehicle has to be raised and the tire has to be removed. The adjustment star wheel of the drum brake has to be accessed then, following which the star wheel can be adjusted. In this way, the drum brakes can be adjusted manually. 41.Describe the brake shoes and brake drum removal and replacement procedure. Brake drums Remove, clean, inspect and measure •Remove the brake drum from the hub. •Clean, check and measure the brake drum. •Use manufacturer recommended asbestos removal equipment for cleaning the drum. •Carefully examine the drum for any spots, cracks or damage. •Measure the drum diameter and compare with the specifications. Replace the drum if the measure exceeds the prescribed limit and machine it, if the measurement is less than the prescribed limit. •Identify and mark the smallest and largest diameter of the drum. •The difference between the largest and smallest diameter is to be related with specifications. •Identify and incorporate for any necessary actions. Brake shoes Brake shoes Removal •Clamp the rear brake hose with a brake shoe clamp.
•Identify the leading brake shoe are remove the top and bottom return springs from the leading shoe grooves. •Remove the brake shoe retaining spring clip along with the pin and remove the leading shoe. •Remove the brake adjuster and handbrake lever linkage. •Remove the trailing shoe spring retaining spring clip and pin. •Disassemble the hand brake lever from the trailing shoe and remove the shoe. •Inspect the wheel cylinder assembly for fluid leaks or damage. Overhaul or replace with a new kit. Installation •Ensure that the backing plate is secured to the axle •Assemble the hand brake lever to the trailing shoe •Release the brake adjuster and back off the handbrake cable adjuster. •