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 system of air.

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: SAEJ1703 or FMVSS No. 116 DOT3
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 plugs with your fingers, 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 other end of the tube in a half-full container of brake fluid.

NOTICE: Bleed air of the rear brake first. If front brake is bled first, rear brake air cannot be bled.

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
6. BLEED LSP & BV
LOAD SENSING PROPORTIONING AND BY-PASS VALVE ON-VEHICLE INSPECTION





1. SET REAR AXLE LOAD
Rear axle load (includes vehicle weight): 924 kg (2,033 lb)





2. INSTALL LSPV GAUGE (SST) AND BLEED AIR
SST 09709-29018





3. RAISE FRONT BRAKE FLUID PRESSURE TO FOLLOWING SPECIFICATION AND CHECK REAR BRAKE FLUID PRESSURE





Rear Brake Fluid Pressure:

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

4. IF NECESSARY, ADJUST FLUID PRESSURE





a. Adjust the fluid pressure by changing the A or B length.
1. Low pressure - Lengthen A, B
2. High pressure- Shorten A, B

HINT: Fluid pressure change for one turn of the lock nut is 100 kPa (1.0 kgf/cm2, 14 psi) and fluid pressure change for 1 mm (0.04 inch) sliding of the adjust bolt within the long hole position is 40 kPa (0.4 kgf/cm2, 6 psi).





b. Torque the lock nut.
Torque: 13 Nm (130 kgf-cm, 9 ft. lbs.)
If it cannot be adjusted, replace the valve body.