Toyota 44610-04150 Booster Assembly, Brake

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To ensure the proper functioning of your power brake booster and maintain air tightness in the system, follow these operating and air tightness check procedures. Depress the brake pedal multiple times with the engine off and confirm that there is no change in the pedal reserve distance. Then, depress the pedal and start the engine. If the pedal slightly goes down, the operation is considered normal. For the air tightness check, start the engine and turn it off after a short duration, while slowly depressing the brake pedal several times. If the pedal depresses less with each depression, it indicates an airtight booster. Alternatively, depress the brake pedal while the engine is running and stop the engine while keeping the pedal depressed. If there is no change in the pedal reserve travel after holding it for 30 seconds, the booster is airtight. When it comes to removal, it is important to note that power brake booster units should not be disassembled, as they require special tools. It is recommended to replace the booster with a new or rebuilt one due to its critical role in brake performance. Start by disconnecting the vacuum hose from the booster, being careful not to damage the vacuum check valve or the hose. Then, remove the brake master cylinder and the left side lower finish panel (knee bolster) from the instrument panel. Detach the pushrod from the brake pedal lever by removing the clevis. Use pliers to remove the clevis pin retaining clip and pull out the pin. Proceed to remove the four nuts securing the brake booster to the firewall, ensuring proper visibility, and slide the booster straight out from the firewall until the studs clear the holes. For installation, follow the reverse order of the removal procedures. Install a new gasket and tighten the clevis locknut securely if it was loosened or removed. Tighten the booster mounting nuts according to the torque specifications. If a new power brake booster unit is being installed, check the pushrod clearance by measuring several dimensions. Compare the calculated pushrod clearance to the specified specifications and adjust the pushrod length if necessary. After the final installation of the master cylinder and brake lines, bleed the system and check the brake pedal height and free play. Lastly, carefully test the operation of the brakes before returning the vehicle to normal operation.