Parts for your 2017 Mitsubishi Asx-Clutch master cylinder

2017 Mitsubishi ASX clutch-master-cylinder: what it does, when it’s needed, and how to look after it

Based on technical sources, a clutch master cylinder is relevant and used on 2017 Mitsubishi ASX models fitted with a manual transmission. The Mitsubishi ASX/RVR/Outlander Sport Workshop Manual (Clutch—Hydraulic System), the Mitsubishi ASA electronic parts catalogue, and major aftermarket catalogues from OEM suppliers (e.g., Exedy and Aisin) all document a hydraulic clutch system for manual variants, including a clutch master cylinder feeding a slave cylinder. ASX models with the CVT automatic have no clutch pedal and therefore do not use a clutch master cylinder.

On manual 2017 ASX models, the clutch master cylinder sits on the firewall under the bonnet and turns pedal movement into hydraulic pressure. That pressure travels to the slave cylinder to disengage the clutch smoothly. It’s a small part doing a big job: giving consistent pedal feel, clean gear changes, and long clutch life by controlling engagement pressure.

Servicing the clutch hydraulics is simple and pays off. The master cylinder shares or uses its own small reservoir for brake-type fluid (DOT 3 or DOT 4—follow Mitsubishi’s spec in the owner’s manual). Fluid absorbs moisture over time, which can corrode internals and soften pedal feel. A periodic flush—often paired with brake-fluid service, typically every 2 years or ~40,000 km—keeps the system healthy. Under routine checks, look for dampness on the pedal, firewall, or beneath the reservoir, and confirm fluid level and colour are right. Dark, gritty, or low fluid needs attention.

• Common symptoms of a tired master cylinder: spongy or sinking pedal, clutch not disengaging cleanly, hard-to-select gears, fluid loss, or weeping at the firewall pushrod.
• Quick care tips: keep the reservoir clean, don’t mix fluid types, and avoid spilling brake fluid on paintwork.

When replacement is due, a quality OEM-equivalent cylinder is recommended. A technician will bench-bleed the new unit, fit and adjust the pushrod free play to spec, then bleed the system at the slave bleeder. After bleeding, pedal height and feel should be even and gear changes smooth. Labour time is typically modest, but bleeding can be fiddly—particularly if the vehicle uses a concentric slave cylinder in the bellhousing—so proper tools and method matter. If the pedal won’t hold pressure, both master and slave should be inspected together to avoid repeat labour.

Popular questions about the 2017 Mitsubishi ASX clutch-master-cylinder

Does every 2017 ASX have a clutch master cylinder?
Only the manual versions do. If it’s a CVT automatic, there’s no clutch pedal and no clutch hydraulics. Under the bonnet, a manual car will have a small clutch fluid reservoir at the firewall—easy way to confirm.

What are the tell-tale signs the clutch master cylinder is failing?
Spongy or sinking pedal, difficulty engaging gears (especially reverse or first), fluid loss, or dampness around the pedal box/firewall. Dark or contaminated fluid can also point to internal seal wear.

How often should the clutch fluid be changed?
A good rule in Australia and New Zealand is every 2 years or around 40,000 km, aligning with brake fluid service. Always use the fluid grade specified by Mitsubishi (typically DOT 3 or DOT 4) and keep the reservoir clean.