4630A479 Mitsubishi HYDRAULIC BSTR ASSY, Price: 1740.89$, Weight: 11.88kg

Hydraulic Brake Booster Assembly

High-quality hydraulic brake assist unit for select Japanese-built vehicles. It delivers strong, consistent pedal assist when you need quick stops, heavy loads, or mountain driving. Built to OEM standards for fit, sealing, and long life. Ideal replacement when vacuum assist is not used or not sufficient.

Why this part is needed

This assembly multiplies your foot force so the car stops with less effort. It keeps pedal feel firm and stable, even during repeated hard braking. A healthy booster helps ABS/ESC work correctly, reduces driver fatigue, and shortens stopping distance.

How it works ⚙️

The unit uses high-pressure hydraulic fluid from a pump and an accumulator. When you press the pedal, a control valve routes pressure to a power piston behind the master cylinder. That pressure adds assist to the pushrod, boosting clamp force at the calipers. Return lines send fluid back to the reservoir. Internal seals, check valves, and a filter keep pressure steady and noise low.

What happens if it fails ❗

• Very hard brake pedal, longer stopping distance
• Pump whine, fluid leaks, or foamy reservoir
• Brake and ABS warnings; pulsing or uneven assist
• Intermittent assist after a few stops (bad accumulator)

Tech tips ️

Match ports and brackets before install; use the specified hydraulic fluid; bleed air from the booster and master circuit; check hoses for collapse; torque fasteners evenly; confirm compatibility by VIN. Replace crush washers and inspect the pedal pushrod free play for precise bite point.