Toyota 44610-33781 Booster Assembly, Brake

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To inspect the brake system, start by loosening the wheel nuts, raising the vehicle, and securing it on jackstands. Remove the wheels. For disc brakes, check pad thickness through inspection holes or remove the caliper for a closer inspection. Measure pad and disc thickness, checking for scoring, gouging, or burn spots. Inspect brake lines and hoses for damage, wear, or leaks. Examine rear parking brake shoes and their components. After installation, snug the wheel nuts, lower the vehicle, and tighten the wheel nuts to the specified torque.

Perform the following checks on the power brake booster: Depress the brake pedal multiple times with the engine off to ensure the pedal reserve distance remains unchanged. Depress the pedal and start the engine. If the pedal slightly moves down, it's operating normally. For an airtightness check, start the engine and turn it off after a minute or two. Depress the brake pedal slowly multiple times; if the pedal depression lessens with each press, the booster is airtight. Depress the brake pedal with the engine running, then stop the engine while keeping the pedal pressed. If the pedal reserve travel doesn't change after holding it for 30 seconds, the booster is airtight.