Toyota Tundra Service Manual: Bleeding

BLEEDING

CAUTION / NOTICE / HINT

NOTICE:

• Perform fluid replacement with the parking brake applied.
• Perform fluid replacement while maintaining the brake fluid level between the MIN/MAX level on the brake fluid reservoir.
• Do not allow brake fluid to contact the vehicle's paint surfaces. If contact occurs, clean it off immediately.
• Make sure there is sufficient brake fluid in the can.
• After adding brake fluid, make sure the reservoir is sufficiently full.
• 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)
  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) Bleed brake line

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

(2) Add brake fluid into the reservoir between MAX and MIN level on the brake fluid reservoir.

Brake fluid:

SAE J1703 or FMVSS No. 116 DOT3

(3) Depress the brake pedal several times and loosen the bleeder plug. With the brake pedal depressed, bleed fluid from the front disc brake caliper RH and LH.

(4) After bleeding the fluid, tighten the bleeder plug and release the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(5) Depress the brake pedal several times and loosen the bleeder plug. With the brake pedal depressed, bleed fluid from the rear disc brake caliper RH and LH.

(6) After bleeding the fluid, tighten the bleeder plug and release the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(b) Check and bleed brake system.

(1) If the following malfunction symptoms occur, air may have entered the brake fluid line. Perform the following air bleed procedures.

• Low pedal or spongy pedal.
• Brake pedal is depressed firmly but braking is insufficient.

(c) Check and adjust brake fluid level in reservoir (See page ).

2. BLEED BRAKE SYSTEM

(a) Bleed brake master cylinder

HINT:

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

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

(2) Add brake fluid into the reservoir between MAX and MIN level on the brake fluid reservoir.

Brake fluid:

SAE J1703 or FMVSS No. 116 DOT3

(3) Using a union nut wrench, disconnect the 2 brake lines from the master cylinder.

(4) Slowly depress and hold the brake pedal.

(5) Block the outer holes with your fingers, and release the pedal.

(6) Repeat the 2 previous steps 3 or 4 times.

(7) Using a union nut wrench, connect the 2 brake lines to the master cylinder.

Torque:

19.5 N·m {199 kgf·cm, 14 ft·lbf}

HINT:

• Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

  Click here

• When using a union nut wrench (fulcrum length of 20 mm (0.787 in.)) + torque wrench (fulcrum length of 180 mm (7.087 in.)): 17.6 N*m (179 kgf*cm, 13 ft.*lbf)

(b) Bleed brake line

(1) Depress the brake pedal several times and loosen the bleeder plug. With the brake pedal depressed, bleed fluid from the front disc brake caliper RH and LH.

(2) After bleeding the fluid, tighten the bleeder plug and release the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(3) Depress the brake pedal several times and loosen the bleeder plug. With the brake pedal depressed, bleed fluid from the rear disc brake caliper RH and LH.

(4) After bleeding the fluid, tighten the bleeder plug and release the brake pedal.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

(c) Bleed VSC actuator assembly

NOTICE:

After bleeding the air from the brake system, if the height or feel of the brake pedal cannot be obtained, perform air bleeding of the brake actuator with the Techstream by following the procedure below.

(1) Depress the brake pedal more than 20 times with the engine off.

(2) Connect the Techstream to the DLC3, and turn the ignition switch on.

NOTICE:

Do not start the engine.

(3) Select AIR BLEEDING on the Techstream.

HINT:

Refer to the Techstream operator's manual for further details.

(4) Bleed the air out of the suction line.

NOTICE:

• Perform the bleeding at the right front wheel and right rear wheel.
• Bleed the air by following the steps displayed on the Techstream.

1. Connect a vinyl tube to the bleeder plug at the right front wheel or the right rear wheel.

2. Loosen the bleeder plug.

3. Operate the brake actuator to bleed the air using the Techstream.

HINT:

This operation stops automatically after 4 seconds.

NOTICE:

Release the brake pedal at this time.

4. Check if the operation has stopped by referring to the Techstream display.

5. Temporarily tighten the bleeder plug.

6. Repeat the 4 previous steps until all air in the fluid is completely bled out.

7. Tighten the bleeder plug.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

8. Repeat all of the above procedures for the other wheel to bleed the air out of the suction line.

(5) Bleed the air out of the pressure reduction line.

NOTICE:

• Perform the bleeding at the 4 wheels.
• Bleed the air by following the steps displayed on the Techstream.

1. Connect a vinyl tube to one of the bleeder plugs.

2. Loosen the bleeder plug.

3. Using the Techstream, operate the brake actuator, completely depress the brake pedal and hold it there.

HINT:

The operation stops automatically after 4 seconds. When performing this procedure continuously, set an interval of at least 20 seconds.

NOTICE:

• During this procedure, the pedal will feel heavy, but completely depress it so that the brake fluid comes out of the bleeder plug.
• Depress and hold the brake pedal. Do not depress and release the pedal repeatedly.

4. Tighten the bleeder plug, and then release the brake pedal.

5. Repeat the 3 previous steps until all air in the fluid is completely bled out.

6. Tighten the bleeder plug.

Torque:

11 N·m {110 kgf·cm, 8 ft·lbf}

7. Repeat all of the above procedures for the other wheels to bleed the air out of the pressure reduction line.

(6) Clear the DTCs (See page ).

(7) Inspect for brake fluid leak.

(8) Check and adjust brake fluid level in reservoir (See page ).

(9) If any DTC is set, perform the troubleshooting for the DTC.

(10) Check the DTC (See page ).