Toyota Tundra 2005 Service - Repair - Maintenance page 2647

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HYDRAULIC BRAKE BOOSTER (w/ VSC)

Inspect front VSC solenoid (SREA) operation.

ON: Activate SREA and SMCF, depress the brake pedal,

and then check that the front wheels do not rotate.

OFF: Deactivate SREA and SMCF. Reactivate SMCF, de-

press the brake pedal, and then check that the front

wheels rotate.

Select "SRCR (SA2)" and "SRCF (SMCF)" on the

hand−held tester.

Turn the "SRCR (SA2)" and "SRCF (SMCF)" on si-

multaneously by the hand−held tester, then de-

press the brake pedal with stable force.

When the solenoids are on, check that the front

wheels do not rotate by hand.

If the front wheels rotate, replace the hydraulic brake booster.

When operating it continuously, set the interval of more

than 20 seconds.

To protect the solenoids, the hand−held tester turns off

automatically 2 seconds after every solenoid has been

When rotating the wheels fast, the fail−safe function is ac-

tivated and judgement cannot be made properly.

So rotate the wheels as slowly as possible.

When the solenoids are off, turn the "SRCF

(SMCF)" on again, then depress the brake pedal

and check the front wheels by rotating them by

If front wheels stop, replace the hydraulic brake booster.

When the "SRCF (SMCF)" is off, depress the brake

pedal again and check that the brake pedal can be

If the pedal can be depressed, replace the hydraulic brake