Montero XLS 4WD V6-3.5L SOHC (2001)
Brake Fluid: Testing and Inspection
BRAKE FLUID LEVEL INSPECTION AND BLEEDING
CAUTION:
-
Use only brake fluid DOT3 or DOT 4.Never mix the specified brake fluid with other brake fluid, as it will significantly decrease braking
performance.
-
Depress the brake pedal slowly. If the brake pedal is pressed too quickly, the pump motor will activate frequency and a large volume of
high-pressure brake fluid may flow from the brake caliper quickly, depleting the HBB reservoir contents and possibly introducing air into the HBB
system.
-
Depending upon the quantity of brake fluid in the reservoir, if the brake pedal is pressed with the reservoir cap removed, the brake fluid in the
reservoir may overflow.
-
Use suitable protection to prevent brake fluid from contacting underhood components and body paint.
HBB Brake System Bleeding
Always bleed the HBB brake system:
-
after servicing the HBB unit
-
if there is excessive brake fluid loss during normal brake system bleeding
-
if you suspect that air has entered the HBB system
HBB system bleeding must be done in the following order:
FRONT BRAKE LINES (FILLING) -> ACCUMULATOR (HBB) -> REAR BRAKE LINES (FILLING) -> POWER SUPPLY (HBB) ABS (HBB)
-> REAR BRAKE LINES (BLEEDING) ->FRONT BRAKE LINES (BLEEDING)
NOTE: The HBB brake system bleeding procedure requires two persons working together.
Required special tool:
-
MB991502: Scan Tool (MUT-II)
-
If brake fluid is drained after removing or installing the HBB, perform the following procedures 1 through 9
CAUTION:
-
Keep the brake fluid reservoir level just above the "MIN" mark at this time. Monitor the fluid level during this procedure to ensure it does not
reach below the "MIN" mark, to prevent air from entering the system.
-
If a large quantity of brake fluid is drained during the bleeding procedure, the accumulator pressure will decrease abnormally. Do not bleed more
than 0.1 dm3 (0.11 quart) from each wheel at a time.
-
Confirm that the pump motor stops after each air-bleeding step. If not, proceed to the troubleshooting the HBB System.
NOTE: The HBB buzzer may sound during this procedure due to low pressure in the system. The buzzer will stop when normal HBB pressure is
restored.
1. Fill the front brake system with brake fluid as follows (RH first, LH second):
1. Attach a clear hose to the RH caliper bleeder valve This helps to monitor air/fluid flow
2. Be sure the fluid level is between "MIN" and "MAX."
3. Turn the ignition switch to the "LOCK" (OFF) position. Pump the brake pedal 3 - 4 times and hold it depressed.
4. Open the RH caliper bleeder valve 1/4 turn.
5. With the bleeder valve still open, pump the brake pedal repeatedly to fill the line with fluid until no obvious air bubbles are seen. When no
more obvious air bubbles are seen, and while the brake pedal is still being pumped, close the bleeder valve.
6. Repeat steps (1) - (5) for the LH caliper.
7
Release the brake pedal when both sides are filled.
2. Fill the pump motor as follows:
1. Turn the ignition switch to the "ON" position to operate the pump motor.
a. If the pump motor operates normally (normal operation sound), go to step 3.
b. If the pump motor operation sound is dry and high-pitched, depress the brake pedal 3 or 4 times to introduce fluid into the pump motor.
Then go to step 3.
3. Fill the accumulator system with brake fluid as follows:
1. Wait for the pump motor to stop from step 2.
2. Depress the brake pedal slowly 3 or 4 times with the ignition switch in the "ON" position. Observe the condition of the brake fluid in the
reservoir.
a. If the fluid is cloudy, leave it for 2 or 3 minutes until it becomes clear.
b. Repeat the procedure (a) until no bubbles appear while pumping the brake pedal.
NOTE: OK to fill the reservoir to "MAX" line during this process. Brake fluid level around the "MIN" line may cause bubbles to appear
from the jet flow of brake fluid while pumping the brake pedal.
4. Fill the rear brake system with brake fluid as follows (RH first, LH second):
