Parts for your 2020 Mitsubishi Eclipse cross-Brake booster

2020 Mitsubishi Eclipse Cross Brake Booster

Yes, the 2020 Mitsubishi Eclipse Cross is fitted with a vacuum-type brake booster. This is confirmed by Mitsubishi’s Eclipse Cross service manual (Brake/Power Brake Unit – vacuum type), the Mitsubishi electronic parts catalogue listing a “Power Brake Booster” for the GK-series Eclipse Cross, and owner’s manual notes that pedal effort increases if the engine is off or vacuum is lost. Those technical sources make it clear the booster is a standard component on this model.

The brake booster’s job is to multiply pedal effort using engine vacuum (and an auxiliary vacuum source on turbocharged models) so the driver gets strong, progressive braking without needing to stomp on the pedal. A one-way check valve holds vacuum in the booster, and a diaphragm uses the pressure difference to assist the pushrod that drives the master cylinder. It’s a quiet helper that makes the Eclipse Cross feel confident and easy to pull up, whether it’s the school run or a long Kiwi/Aussie roadie.

There’s no routine replacement interval for the booster, but it should be checked during servicing. A technician will inspect the vacuum hose and check valve for perishing or cracking, confirm secure mounting at the firewall, and look for brake fluid weeping at the master cylinder seal that could eventually affect the booster. A quick functional test: with the engine off, pump the pedal a few times, hold pressure, then start the engine. The pedal should drop slightly as vacuum assist kicks in. No drop points to a vacuum or booster issue.

• Hard brake pedal, especially after a cold start
• Hissing from the dash area when pressing the pedal
• Longer stopping distances or inconsistent pedal feel
• Engine running rough when the brake is applied (possible vacuum leak)

If replacement is needed, it’s a workshop job. The master cylinder is unbolted from the booster, lines are managed to avoid contamination, the booster is removed from the pedal side under the dash, then everything is refitted with new gaskets/seals and torqued correctly. The system is bled and the vacuum supply rechecked. Expect about a couple of hours for a competent tech, then a proper road test to confirm smooth assist and a solid pedal. Using genuine or high-quality OEM-equivalent parts and keeping the vacuum plumbing in top nick will keep the Eclipse Cross braking strong and compliant for WOF/regos.

Does the 2020 Eclipse Cross actually have a brake booster?

It does. Mitsubishi’s service documentation for the GK-series Eclipse Cross specifies a vacuum power brake unit, and the parts catalogue lists the brake booster assembly for 2020 models. Owner’s manual notes about increased pedal effort with the engine off also indicate a vacuum-assisted system.

How can an owner spot a failing brake booster on this model?

Tell-tales include a hard pedal, a slight hiss when pressing the pedal, rough idle when braking, and a pedal that doesn’t sink slightly when starting the engine after a few pumps. Any of these warrant a workshop check for vacuum leaks, a faulty check valve, or booster diaphragm issues.

Do turbo Eclipse Cross models use a vacuum pump for the booster?

Yes, turbocharged petrol engines commonly use an auxiliary vacuum pump so the booster gets consistent vacuum even when manifold vacuum is low under boost. That ensures the same confident pedal feel whether cruising or accelerating.