Parts for your 2018 Mitsubishi Asx-Brake wheel cylinders

2018 Mitsubishi ASX brake wheel cylinders – what they are and when to replace

Based on Mitsubishi’s own service information for the ASX/RVR/Outlander Sport (2017–2019 model years) and the Mitsubishi ASA/EPC parts listings for the GA-series ASX, the Australian and New Zealand 2018 ASX uses rear drum brakes with hydraulic brake wheel cylinders. Major aftermarket catalogues used by local workshops also list rear wheel cylinders for 2010–2020 ASX models. That means brake wheel cylinders are absolutely relevant to a 2018 Mitsubishi ASX in AU/NZ. Note that some overseas trims with rear disc brakes don’t have wheel cylinders at the back, but that’s not the common AU/NZ setup.

On the ASX’s rear drums, each wheel cylinder converts brake fluid pressure into a pushing force that spreads the brake shoes against the inside of the drum. Inside are pistons and cup seals that must hold pressure cleanly, if they leak or stick, stopping power drops and the pedal can feel spongy. They work in tandem with the self-adjuster, return springs and park brake mechanism, and they play nicely with the ABS/ASC systems because those manage hydraulic pressure upstream.

Typical signs a wheel cylinder’s due for attention include a moist backing plate or brake dust caked with fluid inside the drum, a soft or sinking pedal, the car pulling to one side under brakes, shoes contaminated with fluid, or a gradual drop in master-cylinder fluid. If any of that shows up, it’s time to get it sorted—leaks can extend stopping distances and glaze the shoes.

• Inspection: Have the rear drums pulled at routine services (around 20,000 km or annually). Check dust boots, weep points and shoe contact areas for leaks or binding.
• Replacement: Do both sides on the axle together. If fluid has touched the linings, replace the shoes and clean or machine the drums as needed.
• Fluids: Stick with the specified brake fluid (commonly DOT 4) and flush every 2 years. Old fluid accelerates internal corrosion and seal wear.
• Bleeding: Bleed in the correct sequence and avoid letting the master run dry. A scan tool bleed isn’t usually required, but follow workshop procedure.
• Setup: Lightly lube the shoe lands on the backing plate with high-temp brake grease, confirm the self-adjusters move freely, adjust the park brake and bed the shoes in.

Quality replacement cylinders are inexpensive insurance. Choosing reputable brands and matching the correct bore size for the ASX trim keeps pedal feel consistent and braking performance strong.

Popular questions

Does a 2018 Mitsubishi ASX have rear drum brakes and wheel cylinders in Australia or New Zealand?
Yes. AU/NZ 2018 ASX models commonly run rear drum brakes, which use hydraulic wheel cylinders. Technical references include Mitsubishi’s service manual content for the GA-series ASX and the Mitsubishi ASA/EPC parts catalogue, as well as mainstream aftermarket catalogues that list ASX rear wheel cylinders by VIN and year.

How long do ASX wheel cylinders last?
There’s no fixed interval, but with fresh fluid every two years and clean, dry drums, many last well past 100,000 km. Heat, moisture and old brake fluid speed up seal wear. Any sign of leakage, sticking pistons or a soft pedal warrants replacement in axle pairs.

Can a leaking wheel cylinder damage other rear brake parts?
It can. Brake fluid on the shoes ruins the lining and can glaze the drum surface. If a cylinder leaks, budget for new shoes and a drum clean or machine at the same time, then bleed with fresh fluid to protect the new parts.