Genuine Mitsubishi Pajero Sport Brake Booster 2018–2024 | 4630A454

Brake booster is an important part of the Mitsubishi Pajero Sport braking system. It amplifies the force applied to the brake pedal using a vacuum-assist mechanism, so the driver can generate the required braking pressure without pressing the pedal as hard.

Over time, the booster diaphragm, control valve or internal components may wear, develop a vacuum leak or become damaged. This can make the brake pedal unusually hard to press, reduce braking force or cause an unusual hissing sound near the pedal or in the engine bay.

This is a genuine Mitsubishi part, number 4630A454, listed in the parts catalog as Booster Assembly, Brake. The part number is listed for Pajero Sport/Pajero-Montero Sport, including 2WD models with the 2.4L 4N15 diesel engine.

Product Information

• Product name: Brake Booster Assembly

• Part number: 4630A454

• Brand: Mitsubishi

• Vehicle: Mitsubishi Pajero Sport

• Model years: 2018–2024 

• Installation location: Behind the master cylinder, at the engine-bay bulkhead

• System: Brakes

• Part type: Brake booster

• Condition: New

Function and Role

• Amplifies the force applied to the brake pedal.

• Reduces the effort needed when braking.

• Helps the master cylinder generate brake fluid pressure.

• Contributes to braking control and performance.

Key Features

• Genuine Mitsubishi part.

• Part number 4630A454 for convenient lookup and verification.

• Listed for the Pajero Sport in the parts catalog.

• Suitable for replacing an old brake booster with a vacuum leak or loss of assist.

Signs It May Need Inspection or Replacement

• The brake pedal feels unusually hard or stiff.

• Braking force is reduced, even when the driver presses harder.

• A hissing sound occurs when pressing or releasing the brake pedal.

• Brake assist is inconsistent.

• The booster or its connection points show signs of leakage or damage.

Replacement Recommendations

When replacing the brake booster, also inspect the vacuum hose, check valve, master cylinder and related connections. After installation, check the brake-assist system for leaks and test brake operation according to the correct service procedure before driving the vehicle.

Check Compatibility Before Ordering

Part number 4630A454 is listed for the Mitsubishi Pajero Sport/Pajero-Montero Sport. Note that the parts catalog distinguishes between part numbers 4630A454 and 4630A455 for different vehicle configurations; 4630A455 is listed for some 4WD versions. To confirm fitment, please provide the VIN or the part number on the old brake booster before ordering.