Depress the brake pedal and check the braking efficiency. If the efficiency is insufficient, check the operation of the brake booster and its tightness (see below).
If the brake booster is the cause of the inefficient operation of the brake system, replace it with a new one.
B. Checking the seals and seals of the master cylinder rod
1) Press the brake pedal and check the braking efficiency (*1).
2) Check if the pedal travel is different when you press the pedal softly and hard.
3) Visually inspect the master cylinder for damage and fluid leaks.
If the master cylinder is damaged or leaking (*2), or the pedal travel changes, disassemble the master cylinder and replace non-reusable components (see below).
C. Checking the brake hoses
Check brake hoses for damage and leaks.
If necessary, replace the brake hoses with new ones.
D. Checking pistons and brake caliper boots
1. Press the brake pedal and check the braking performance (*1).
2. Visually inspect the brake calipers for damage and fluid leaks.
If the brake pedal does not work satisfactorily or the caliper sticks, there is damage, fluid leakage, etc., disassemble the caliper and check. Be sure to replace the components (piston cups, anthers, etc.) (see below).
*1: Check the brake action and whether the braking distance is within the set value.
*2: There may be fluid leakage on the underside of the master cylinder/brake booster connection area, however, if the area is dry, it is fine.