Brake System Operation and Leakage Check

Check all of the following items:

Component Procedure
Brake Booster (A) Check brake operation by applying the brakes during a test drive. If the brakes do not work properly, check the brake booster. Replace the brake booster as an assembly if it does not work properly or if there are signs of leakage.
Piston Cup and Pressure Cup Inspection (B)
Check brake operation by applying the brakes. Look for damage or signs of fluid leakage. Disassemble and inspect the master cylinder if the pedal does not work properly or if there is damage or signs of fluid leakage. Replace the secondary piston and primary piston as an assembly whenever the master cylinder is disassembled.
Check for a difference in brake pedal stroke between quick and slow brake applications. Disassembly and inspect the master cylinder if there is a difference in pedal stroke. Replace the secondary piston and primary piston as an assembly whenever the master cylinder is disassembled.

Brake Hoses (C) Look for damage or signs of fluid leakage.Replace the brake hose with a new one if it is damaged or leaking.
Caliper Piston Seal and Piston Boots (D) Check brake operation by applying the brakes.
Look for damage or signs of fluid leakage. If the pedal does not work properly, the brakes drag, or there is damage or signs of fluid leakage, disassemble and inspect the brake caliper. Replace the boots and seals with new ones whenever the brake caliper is disassembled.
Wheel Cylinder Piston Cup and Dust Cover (E) Check brake operation by applying the brakes.
Look for damage or signs of fluid leakage.Disassemble and inspect the wheel cylinder if the pedal does not work properly, the brakes drag, or there is damage or signs of fluid leakage. Replace the piston cups (KQ, KU and KT models: piston assembly) and dust covers with new ones whenever the wheel cylinder is disassembled.

Component	Procedure
Brake Booster (A)	Check brake operation by applying the brakes during a test drive. If the brakes do not work properly, check the brake booster. Replace the brake booster as an assembly if it does not work properly or if there are signs of leakage.
Piston Cup and Pressure Cup Inspection (B)	Check brake operation by applying the brakes. Look for damage or signs of fluid leakage. Disassemble and inspect the master cylinder if the pedal does not work properly or if there is damage or signs of fluid leakage. Replace the secondary piston and primary piston as an assembly whenever the master cylinder is disassembled. Check for a difference in brake pedal stroke between quick and slow brake applications. Disassembly and inspect the master cylinder if there is a difference in pedal stroke. Replace the secondary piston and primary piston as an assembly whenever the master cylinder is disassembled.
Brake Hoses (C)	Look for damage or signs of fluid leakage.Replace the brake hose with a new one if it is damaged or leaking.
Caliper Piston Seal and Piston Boots (D)	Check brake operation by applying the brakes. Look for damage or signs of fluid leakage. If the pedal does not work properly, the brakes drag, or there is damage or signs of fluid leakage, disassemble and inspect the brake caliper. Replace the boots and seals with new ones whenever the brake caliper is disassembled.
Wheel Cylinder Piston Cup and Dust Cover (E)	Check brake operation by applying the brakes. Look for damage or signs of fluid leakage.Disassemble and inspect the wheel cylinder if the pedal does not work properly, the brakes drag, or there is damage or signs of fluid leakage. Replace the piston cups (KQ, KU and KT models: piston assembly) and dust covers with new ones whenever the wheel cylinder is disassembled.

NOTE: LHD type is shown, RHD type is symmetrical.