Bleeding the Brake System

BRAKE FLUID BLEEDING

HINT: If any work is done on the brake system or if air is suspected in the brake lines, bleed the air from the system.

NOTICE: Do not let brake fluid remain on a painted surface. Wash it off immediately.






1. FILL BRAKE RESERVOIR WITH BRAKE FLUID
Check the fluid level in the reservoir after bleeding each wheel. Add fluid, if necessary.
Fluid: SAE J1703 or FMVSS No. 116 DOT 3
2. BLEED MASTER CYLINDER

HINT: If the master cylinder has been disassembled or if the reservoir becomes empty, bleed the air from the master cylinder.

a. Disconnect the brake lines from the master cylinder.






b. Slowly depress the brake pedal and hold it.






c. Block off the outlet plug with your finger, and release the brake pedal.
d. Repeat (b) and (c) 3 or 4 times.

Loosen/Tighten Bleeder Plug:

3. CONNECT VINYL TUBE TO BRAKE CALIPER OR WHEEL CYLINDER BLEEDER PLUG
Insert the other end of the tube in a half-full container of brake fluid.

HINT: Begin air bleeding from the wheel cylinder with the longest hydraulic line.

4. BLEED BRAKE LINE
a. Slowly depress the brake pedal several times.
b. While an assistant depresses the pedal, loosen the bleeder plug until fluid starts to run out. Then tighten the bleeder plug.
c. Repeat this procedure until there are no more air bubbles in the fluid.
Torque: (bleeder plug) 11 Nm (110 kgf-cm, 8 ft. lbs.)
5. REPEAT PROCEDURE FOR EACH WHEEL
ON-VEHICLE INSPECTION

HINT: Pre runner is the described below.
RZN191L-TRPDKAB, RZN196L-CRPDKAB, VZN195L-RPDKAB






1. SET REAR AXLE LOAD





Rear axle load (includes vehicle weight):






2. INSTALL LSP & BV GAUGE (SST) AND BLEED AIR
SST 09709-29018





3. RAISE FRONT BRAKE PRESSURE TO 7,845 kPa (80 kgf/cm2, 1,138 psi) AND CHECK REAR BRAKE PRESSURE






Rear Brake Pressure:

HINT: The brake pedal should not be depressed twice and/or returned while setting to the specified pressure. Read the value of rear brake pressure 2 seconds after adjusting the specified fluid pressure. If the brake pressure is incorrect, adjust the fluid pressure.






4. IF NECESSARY, ADJUST FLUID PRESSURE
a. Adjust the length of the No. 2 shackle.
Low pressure - Lengthen A
High pressure - Shorten A






Initial Set:






Adjustment Range:

HINT: One turn of the nut changes the fluid pressure as shown in the following table.






Rear Brake Pressure:






b. If the pressure cannot be adjusted by the No. 2 shackle, raise or lower the valve body.
Low pressure - Lower body
High pressure - Raise body
c. Torque the nuts.
Torque: 13 Nm (130 kgf-cm, 9 ft. lbs.)
d. Adjust the length of the No. 1 shackle again. If it cannot be adjusted, inspect the valve housing.






5. IF NECESSARY, CHECK VALVE BODY
a. Assemble the valve body in the uppermost position.

HINT: When the brakes are applied, the position will move down about 0.8 mm (0.03 inch). Even at this time, the piston should not make contact with or move the load sensing spring.






b. In this position, check the rear brake pressure.






If the measured value is not within the standard, replace the valve body.