INSPECTION BEFORE REMOVAL Air Tight ■ CAUTION ■ Check the air tight condition when the master cylinder and the brake booster is installed.

1.With a handy vacuum pump, apply vacuum pressure of –66.7 kPa (–500 mmHg, –19.70 inHg) to the brake booster.

2.If the air tight condition cannot be maintained, perform the following operation.

(1)Check the no dirt and dust are present on the brake booster and brake master cylinder mating faces. Clean it if necessary.

(2)Check O-ring on the master cylinder. If anything is found, replace the O-ring.

(3)Check the air tight condition again. If the condition still cannot be maintained, replace the brake booster.

ADJUSTMENT AFTER REMOVAL
Input Rod Length adjustment

1.Loosen the lock nut (1) and adjust the input rod (2) to the specified length (A).

A | : Refer to Brake Booster (GT-R certified NISSAN dealer).

2.Tighten the lock nut to the specified torque.

INSPECTION AFTER INSTALLATION
Operation
Depress the brake pedal several times at 5-second intervals with the engine stopped. Start the engine with the brake pedal fully depressed. Check that the clearance between brake pedal and dash lower pane decreases.
NOTE：
A slight impact with a small click may be felt on the pedal when the brake pedal is fully depressed. This is a normal phenomenon due to the brake system operation.
Air Tight

- Idle the engine for 1 minute to apply vacuum to the brake booster, and stop the engine. Then depress the brake pedal several times at 5-second intervals until the accumulated vacuum is released to atmospheric pressure. Check that the clearance between brake pedal and dash lower panel gradually increases (A → B → C) each time the brake pedal is depressed when performing this operation.
- Depress the brake pedal with the engine running. Then stop the engine while holding down the brake pedal. Check that the brake pedal stroke does not change after holding down the brake pedal for 30 seconds or more.
  NOTE：
  A slight impact with a small click may be felt on the pedal when the brake pedal is fully depressed. This is a normal phenomenon due to the brake system operation.

ADJUSTMENT AFTER INSTALLATION
Perform the brake pedal adjustment after installing the brake pedal assembly. Refer to Inspection and Adjustment.