Toyota 44610-07131 Booster Assembly, Brake

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Perform a brake booster check by starting the engine with the brake fully depressed and observing pedal movement. The pedal travel should remain consistent. Turn off the engine, hold the pedal for 30 seconds, and restart the engine to confirm decreased pedal travel with each subsequent application. Check the parking brake by counting clicks when engaging it with the handle or pedal. Adjust the parking brake if the click count deviates from the specified value. Alternatively, verify parking brake effectiveness on a steep hill in Neutral; if the vehicle rolls, perform parking brake adjustments.

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.

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.

Installation is the reverse of removal. Tighten the clevis locknut and booster mounting nuts securely. After final installation of the master cylinder, brake hoses, and lines, adjust brake pedal height, freeplay, and pedal reserve distance, then bleed the system before normal vehicle operation.