Parts for your 2006 Mitsubishi Lancer-Brake booster

2006 Mitsubishi Lancer Brake Booster

According to technical sources including the Mitsubishi Lancer Factory Service Manual for the 2002–2007 CS/CH platform (Group 35 – Brakes, Power Brake section), the vehicle is fitted with a vacuum-operated brake booster. This is also supported by mainstream parts catalogues used in workshops (e.g., Mitsubishi ASA OEM catalogue and common aftermarket listings for 2002–2007 Lancer boosters). So yes, a brake booster is relevant to the 2006 Mitsubishi Lancer.

On this model, the brake booster’s job is to use engine vacuum to multiply the driver’s pedal effort, giving a confident, progressive pedal and shorter stopping distances with less leg power. It sits on the firewall between the brake pedal and the master cylinder, and when everything’s healthy the pedal should feel firm-yet-assisted, not wooden or overly heavy.

Over time, the booster diaphragm, check valve or vacuum hose can age, and the pedal feel or engine behaviour can give the game away. Drivers can do a quick home check: with the engine off, pump the brake a few times to exhaust vacuum, hold steady pressure on the pedal, then start the engine. If the booster is working, the pedal should drop slightly as vacuum assist comes in.

• Hard brake pedal with more effort than usual, especially at low revs
• Hissing noise at the firewall area when pressing the pedal
• Rough idle or stalling when braking (vacuum leak)
• Longer stopping distances or a “grabby then hard” pedal feel
• Brake fluid traces between the master cylinder and booster (often a master cylinder issue that can contaminate the booster)

Good servicing on a 2006 Lancer includes checking the booster vacuum hose, one-way check valve, and grommets at every service or at least every 20,000 km. Keep an eye on pedal free play and ensure no fluid is weeping from the master cylinder into the booster. If there’s any doubt, pressure/vacuum testing per the workshop manual is the next step.

Replacement is straightforward for a trained tech: disconnect the battery, move the master cylinder off the studs (often without opening the lines), unclip the pedal clevis inside the cabin, remove the booster nuts, swap in the new unit, adjust the pushrod/pedal free play, and road test. Allow roughly 1.5–3.0 hours depending on variant and access. Use quality new or reman boosters, replace the check valve and hose if aged, and verify ABS operation post-service. Note: Evolution and some trim levels use different booster/master specs—always match by VIN.

What are common symptoms of a failing brake booster on a 2006 Lancer?

Expect a harder-than-normal pedal, a faint hiss at the firewall, longer stopping distances, or a rough idle when braking due to a vacuum leak. If the master cylinder is leaking, fluid can damage the booster diaphragm, so check for dampness where the master meets the booster.

Is it safe to drive with a faulty brake booster?

It’ll usually still stop the car, but the pedal effort skyrockets and stopping distances increase, especially in an emergency. If the engine stalls when braking or the pedal is rock hard, treat it as unsafe and arrange repair before further driving.

How much does a 2006 Lancer brake booster replacement cost in AU/NZ?

As a ballpark, parts can range from $250–$700 depending on new vs reman and variant, labour is typically 1.5–3.0 hours. It’s smart to budget for a new check valve and vacuum hose, and possible brake fluid and bleed time if lines are disturbed.