Parts for your 2000 Mitsubishi Pajero-Brake booster

2000 Mitsubishi Pajero Brake Booster — What it does and how to look after it

Technical sources confirm the 2000 Mitsubishi Pajero is fitted with a vacuum-assisted brake booster (also called a power brake servo). The Mitsubishi Pajero NM/NP workshop manual (Group 35 – Brakes) details vacuum booster testing and service, and the Mitsubishi ASA electronic parts catalogue lists “Booster, Brake” for 2000 model variants. General service references like the Haynes/Max Ellery Pajero manuals also include booster operation and diagnostics for this model range.

On the 2000 Pajero, the brake booster multiplies pedal force using engine vacuum so the driver doesn’t have to stand on the pedal to stop smartly. Press the brake, a control valve inside the booster balances vacuum and atmospheric pressure across a diaphragm, and the extra force pushes the master cylinder. Petrol versions use manifold vacuum, diesel variants use a vacuum pump to feed the booster. The result is a consistent, confidence-inspiring pedal with less effort — especially handy when towing or on steep Kiwi and Aussie backroads.

As part of regular servicing, the booster and its plumbing deserve a quick once-over. A healthy booster gives a firm-but-assisted pedal. Tell-tale issues include a hard pedal, longer stopping distances, a hissing noise around the driver’s side firewall, or the engine stumbling when the brake is pressed. The one-way check valve on the booster and the vacuum hose are common culprits, perishing hoses or weak check valves can rob the system of vacuum and feel.

If the master cylinder has leaked internally, brake fluid can enter the booster and ruin its diaphragm — in that case, replace the booster and master cylinder together. When replacing the booster on a Pajero, the master cylinder is usually swung forward without cracking the lines, then the booster is unbolted from the firewall and the pushrod disconnected from the pedal. Always set the pushrod-to-master-cylinder free play to workshop spec and renew the booster-to-firewall gasket. If hydraulic lines are opened during the job, bleed the brakes thoroughly and verify a solid pedal before road-testing. A competent technician will typically allow 1.5–3 hours, depending on access and corrosion. For longevity, keep the vacuum hose tight, the check valve oriented correctly, and inspect the area at every service interval or 10,000–15,000 kilometres.

• Symptoms to watch: hard pedal, hissing at the firewall, poor assist at idle, longer stopping distance, brake warning after master leak.
• Quick checks: vacuum hose condition, secure clamps, check-valve one-way function, booster holds vacuum for several minutes after shutdown.

A sound brake booster keeps a 2000 Pajero’s braking feel light, predictable, and safe — exactly what’s needed for touring, towing, and the daily grind.

Popular questions about 2000 Mitsubishi Pajero brake boosters

How can someone quickly test the brake booster at home?
With the engine off, pump the brake pedal a few times to deplete any stored vacuum, then hold the pedal down and start the engine. If the booster is working, the pedal should drop slightly as vacuum assist kicks in. No drop and a persistently hard pedal suggests a booster, vacuum hose, or check-valve issue.

Is it safe to drive a 2000 Pajero if the brake booster is failing?
It will still have brakes, but the pedal effort rises sharply, especially at low engine speeds. That can be risky in traffic or off-road. It’s best to drive minimally and have the fault diagnosed promptly to avoid extended stopping distances and driver fatigue.

What else should be replaced when fitting a new booster?
Commonly, the vacuum hose and check valve are renewed, along with the booster gasket. If there’s evidence of brake fluid inside the booster or around the master cylinder rear seal, replace the master cylinder at the same time to protect the new booster.