Power Brake Unit Except Land Cruiser Runner

Operational Check

Depress brake pedal several times with engine off. There should be no change in pedal reserve distance.

Depress brake pedal and start engine. If pedal goes down slightly, operation is normal.

Air Tightness Check

1. Start engine and run for 1-2 minutes, then turn engine off. Depress brake pedal several times slowly. If pedal goes down farthest on first time, but gradually rises after second or third time, power brake unit is airtight.

2. With engine stopped, depress brake pedal several times using normal pressure. Pedal should be low when first depressed. On consecutive applications, pedal height should gradually rise. If pedal height does not increase, check for air leaks.

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