Operation and Leak Check

Check all of the following items:

Component	Procedure
Brake Booster (A)	Check brake operation by applying the brakes during a road test. If the brakes do not operate properly, inspect the brake booster. Replace the brake booster assembly if it does not operate properly or if there are signs of leakage.
Piston Cup and Pressure Cup Inspection (B)	Check brake operation by depressing the brake pedal. Check for damage or signs of fluid leakage. Replace the master cylinder assembly if the pedal does not operate properly or if there is damage or signs of fluid leakage. Check the brake pedal travel difference between quick and slow braking. Replace the master cylinder if there is a difference in pedal travel.
Brake Hoses (C)	Check 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 depressing the brake pedal. Check for damage or signs of fluid leakage. If the pedal does not operate properly, the brakes do not brake correctly, or there is damage or signs of fluid leakage, disassemble and inspect the brake caliper. Replace the dust boots and seals with new ones each time the brake caliper is disassembled.

Brake Bleeding

1. 1
   Make sure the brake fluid level in the reservoir is at the MAX (upper) level line.
2. 2
   Have an assistant slowly depress the brake pedal several times, then hold pressure.
3. 3
   Loosen the right rear brake bleeder screw (A) to allow air to exit the system. Then securely tighten the bleeder screw. Front

   

   Rear

   

4. 4
   Repeat the procedure for each wheel in the sequence shown below until no more air bubbles appear in the fluid.

   

5. 5
   Fill the master cylinder reservoir to the MAX (upper) level mark.
6. 6
   Remove the reservoir cap and fill the brake reservoir with brake fluid.
7. 7
   Connect a clear plastic tube to the wheel cylinder bleeder fitting and place the other end of the tube into a half-filled clear plastic bottle.
8. 8
   Connect GDS to the data link connector located under the instrument panel.
9. 9
   Select and follow the instructions on the GDS screen.

   1. Select the vehicle model name.
   2. Select the Anti-lock Brake System.
   3. Select the HCU air bleeding mode.

      

   4. Press "OK" to operate the motor pump and solenoid valve.

      

   5. Wait 60 seconds before performing the air bleeding operation. (Otherwise, the engine may be damaged.)

      

   6. Perform air bleeding.

      

10. 10
    Depress the brake pedal several times, then loosen the bleeder fitting. Tighten until fluid flows out without bubbles. Then close the bleeder screw (A). Front

    

    Rear

    

11. 11
    Repeat step 5 in the order described below until there are no more air bubbles in the fluid for each wheel.

    

12. 12
    Tighten the bleeder screw. Bleeder screw tightening torque: 6.9 ~ 12.7 N·m

ESC Brake Bleeding. This procedure must be performed to ensure proper air removal and filling of the ESC unit, brake lines and master cylinder with brake fluid.