Kia 591102F100 Booster Assembly-Brake

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When checking the serviceability of power brake booster, start by pressing several times on the brake pedal without engine running until no further travel or range is noted. This done with the engine off, press the pedal down and start it; if it move a little bit downwards-it is normal. To check for air leaks, run the engine for a minute or two and then switch off while slowly depressing the brake pedal. Whereupon; if at first it drops but later rises after 2 or 3 depressions, this means that there are no leakage in booster. Run engine and when brakes pedal moves down hold it down and stop engine after 30 seconds; if in this period there are no changes in initial traveling of pedal, it indicates that booster has no leaks. Concerning removal issues though, power brake boosters should not be disassembled but they should be replaced with either new or rebuilt ones. Take out master cylinder assembly from vehicle body, separate hose from vacuum source to booster, remove push rod clevis pin which connects booster with brake pedal and four nuts that hold main unit to fire wall where its mounted. Then slide out the brake booster from firewall ensuring that studs clear holes. For installation purpose if it's a new one adjust clevis on rod of old one to match up, then go back through removal steps using torque value on clamping bolts and cotter pin to retain clevis pin. The new unit of power brake boosters should have zero clearance between push rod and master cylinder arm adjust as required by using an adjusting screw provided on top of these units. Finally check free play at your pedals before bleeding your brakes after installing both master cylinder unit including all brake tubing and hoses.

During the inspection of disc brakes, both inner and outer brake pads must be checked for wear, and measurements should be compared with specified limits. Any pad thickness below the limit requires replacement. Additionally, the disc should be examined for score marks, wear, and burned spots, necessitating servicing or replacement if present.