Toyota 4Runner: Bleeding

Toyota 4Runner Service Manual / Brake / Brake System (other) / Brake Fluid(for Vacuum Brake Booster) / Bleeding

BLEEDING

CAUTION / NOTICE / HINT

NOTICE:

As brake fluid may overflow, do not leave the brake fluid can in the reservoir filler opening when adding brake fluid.
Bleed air while adding fluid to maintain the fluid level between the MIN and MAX lines of the reservoir.
Do not allow brake fluid to come into contact with any painted surface. If contact occurs, wash off the fluid immediately.
If bleeding is performed with the engine running or the ignition switch ON, DTC C1441 will be stored. Make sure to clear the DTCs when work is complete (for VSC).

When bleeding air, select the suitable procedure listed below.

Replaced/Installed Item	Work procedure
Flexible hose (front/rear)	Bleed brake line
Disc brake cylinder assembly (front/rear)	Bleed brake line
Brake actuator assembly	Bleed brake system
Brake master cylinder sub-assembly
Brake master cylinder reservoir assembly
Brake booster assembly

PROCEDURE

1. BLEED BRAKE LINE

(a) Remove the brake master cylinder reservoir filler cap assembly.

(b) Add brake fluid until the fluid level is between the MIN and MAX lines of the reservoir.

(d) Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the front disc brake cylinder RH.

NOTICE:

Add fluid as necessary so that the fluid in the reservoir does not decrease below the MIN level.

(e) After air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(f) Bleed the air from the bleeder plug of the front disc brake cylinder LH using the same procedure as for the RH side.

(g) Loosen the bleeder plug of the rear disc brake cylinder RH.

(h) Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the rear disc brake cylinder RH.

NOTICE:

Add fluid as necessary so that the fluid in the reservoir does not decrease below the MIN level.

(i) After air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(j) Bleed the air from the bleeder plug of the rear disc brake cylinder LH using the same procedure as for the RH side.

(k) Inspect for brake fluid leaks.

(l) Check and adjust the brake fluid level (See page ).

(m) Check and clear the DTCs (See page for VSC).

2. BLEED BRAKE SYSTEM

CAUTION:

If air is bled without using the Techstream, damage or accidents may result. Therefore, always use the Techstream when bleeding air.

(a) Remove the brake master cylinder reservoir filler cap assembly.

(b) Add brake fluid until the fluid level is between the MIN and MAX lines of the reservoir.

(d) Slowly depress and hold the brake pedal.

(e) Block the tube holes with your fingers, and then release the brake pedal.

(f) Remove your fingers, slowly depress and hold the brake pedal, block the tube holes with your fingers again, and then release the brake pedal. Repeat this step 3 or 4 times.

(g) Using a union nut wrench, connect the 2 brake tubes to the brake master cylinder assembly.

Torque:

Specified tightening torque :

20 N·m {199 kgf·cm, 14 ft·lbf}

HINT:

Calculate the torque wrench reading when changing the fulcrum length of the torque wrench See page ).

When using a union nut wrench (fulcrum length of 20 mm (0.787 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)):
17 N*m (177 kgf*cm, 13 ft.*lbf)

(h) Loosen the bleeder plug of the front brake cylinder RH.

(i) Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the front brake cylinder RH.

NOTICE:

Add fluid as necessary so that the fluid in reservoir does not decrease below the MIN level.

(j) After air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(k) Bleed the air from the bleeder plug of the front disc brake cylinder LH using the same procedure as for the RH side.

(l) Loosen the bleeder plug of the rear brake cylinder RH.

(m) Repeatedly depress the brake pedal and bleed the air from the bleeder plug of the rear brake cylinder RH.

NOTICE:

Add fluid as necessary so that the fluid in the reservoir does not decrease below the MIN level.

(n) After the air is completely bled out, tighten the bleeder plug while depressing the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(o) Bleed the air from the bleeder plug of the rear disc brake cylinder LH using the same procedure as for the RH side.

(p) Turn the ignition switch off and connect the Techstream to the DLC3.

(q) Turn the ignition switch to on and turn the Techstream on.

NOTICE:

Do not start the engine.

(r) Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Air Bleeding.

(s) Select and run "Inhalation" from the Air Bleeding screen on the Techstream.

NOTICE:

Follow the prompts on the tester screen to bleed the air for both wheels (front and rear) on the right side.

(t) Loosen the bleeder plug of the right front wheel.*1

(u) Using the Techstream, operate the actuator.

HINT:

To protect the actuator, the operation stops automatically.
Make sure the brake pedal is released.

(v) Check the Techstream screen to confirm that the operation stopped.

(w) Tighten the bleeder plug.*2

(x) Repeat the procedures above from *1 to *2 until the air is completely bled out.

(y) Tighten the bleeder plug.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(z) Bleed the air for the right rear wheel using the same procedure as for the right front wheel.

(aa) Select and run "Decrease" from the Air Bleeding screen on the Techstream.

NOTICE:

Follow the prompts on the tester screen to bleed the air for all 4 wheels.

(ab) Loosen the bleeder plug of the right front wheel.*3

(ac) Using the Techstream, operate the actuator and at the same time fully depress and hold the brake pedal.

HINT:

To protect the solenoids, the actuator operation stops automatically in 4 seconds. When operating the actuator repeatedly, follow the prompts on the tester screen and wait for 20 seconds or more between each operation.

NOTICE:

At this time, the brake pedal becomes difficult to depress. However, be sure to hold the brake pedal in the fully depressed position until brake fluid comes out of the bleeder plug.
Do not repeatedly depress the brake pedal, hold the brake pedal in the fully depressed position.

(ad) Tighten the bleeder plug and release the brake pedal.*4

(ae) Repeat the procedures above from *3 to *4 until the air in completely bled out.

(af) Tighten the bleeder plug.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(ag) Bleed the air for the other 3 wheels using the same procedure as for the right front wheel.

(ah) Repeat the procedure in which air is bled from the brake line by repeatedly depressing the brake pedal.

NOTICE:

Repeat this step for each wheel until air is completely bled out.

(ai) Inspect for brake fluid leaks.

(aj) Inspect fluid level in reservoir (See page ).

(ak) Check and clear the DTCs (See page for
VSC).

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