BLEEDING <Except vehicles without ABS>


caution Specified brake fluid: DOT 3 or DOT 4

  • Always use the specified brake fluid. Avoid using a mixture of the specified brake fluid and other fluid.
  • Maintain the fluid reservoir level between the MIN and MAX marks during the air bleeding.
  • Do not depress the brake pedal hard during the air bleeding (normal air bleeding) to prevent the pump motor from operating frequently.
  • After the air bleeding, check that the brake dragging does not become stronger.
  • If the pedal is depressed with the reservoir cap removed, the brake fluid may overflow. Do not depress the brake pedal while the fluid is being added.

NORMAL AIR BLEEDING
After the front brake or the rear brake is removed and installed, some fluid may remain in the hydraulic brake booster (HBB) reservoir. In this case, bleed air from the brake caliper.

HBB SYSTEM AIR BLEEDING
If all the brake fluid inside the reservoir is drained due to the removal and installation of the HBB, bleed air as follows:
1.<Air bleeding from front brake system>
(1) Turn the ignition switch to the LOCK (OFF) position. Bleed air from the front brake calipers (right and left) by pumping the brake pedal.
2.<Pump motor operation>
(1) Turn the ignition switch ON, and operate the pump motor. If the pump motor is running free, supply the brake fluid into the pump motor by depressing the brake pedal three or four times.
3.<Air bleeding from accumulator system>
(1) After the pump motor stopped, depress the brake pedal three or four times with the ignition switch ON. Then observe the brake fluid in the reservoir. If the brake fluid looks whitish, wait for a few minutes until it becomes clear.
(2) Repeat step (1) until the brake fluid becomes clear.
4.<Air bleeding from rear brake system>
(1)
caution
  • If too much brake fluid is drained at a time, the accumulator pressure may be dropped abnormally. So limit drain amount at a time to 100 cm3 or less, and check that the pump motor stops per one air-bleeding.
  • If the brake fluid level in the reservoir has been dropped, air may enter the pump motor accidentally. To avoid this, always maintain the brake fluid between the MIN and MAX marks.
While the ignition switch is turned ON and the brake pedal is depressed, bleed air from the right and left rear brake calipers.
5.<Air bleeding from power supply system>
(1) Turn the ignition switch to the LOCK (OFF) position. Depressurise the HBB power supply system by depressing the brake pedal several times until the braking effort becomes high.
(2) Turn the ignition switch ON, and depress the brake pedal quickly twenty times. Then check that the pump motor stops.
(3) Turn the ignition switch to the LOCK (OFF) position. Depressurise the power supply system of the hydraulic brake booster (HBB) by depressing the brake pedal until the pedal effort becomes high.
(4) Then turn the ignition switch ON, and then operate the pump motor. The pump motor should stop within 25 seconds. If the pump motor does not stop, bleed air from the power supply system again [see steps (1) - (4)].
6.<Air bleeding from ABS system>
(1)
caution Turn the ignition switch to the LOCK (OFF) position when connecting and disconnecting the M.U.T.-III.
Turn the ignition switch to the LOCK (OFF) position, and connect the M.U.T.-III to the diagnosis connector.
(2) Turn the ignition switch ON, and then select the menu display on the M.U.T.-III as follows:
’’ABS/ASC’’ to ’’ACTUATOR TEST’’ to ’’AIR BLEEDING (1).’’
(3)
caution If you carry out the ’’AIR BLEEDING (1)’’ repeatedly, wait for at least twenty seconds before the second operation.
While the ignition switch is turned ON and the brake pedal is depressed, carry out the actuator test ’’AIR BLEEDING (1).’’
(4) Then select "AIR BLEEDING (2)" on the M.U.T.-III menu display, and carry out the "AIR BLEEDING(2)" while the ignition switch is turned ON and the brake pedal is depressed.
7.<Air bleeding from rear brake system (final stage)>
(1)
caution
  • If too much brake fluid is drained at a time, the accumulator pressure may be dropped abnormally. So limit drain amount at a time to 100 cm3 or less, and check that the pump motor stops per one air-bleeding.
  • If the brake fluid level in the reservoir has been dropped, air may enter the pump motor accidentally. To avoid this, always maintain the brake fluid between the MIN and MAX marks.
Bleed air from the rear brake calipers completely while the ignition switch is turned ON and the brake pedal is depressed.
8.<Air bleeding from front brake system (final stage)>
(1) Operate the pump motor while the ignition switch is turned ON. Bleed air from the front brake calipers completely by pumping the brake pedal.
9.<Adding brake fluid>
(1) Turn the ignition switch to the LOCK (OFF) position. Depressurise the power supply system of the hydraulic brake booster (HBB) by depressing the brake pedal at least forty times until the pedal effort becomes high.
(2) Add the brake fluid up to the MAX mark on the reservoir.