Parts for your 1986 Mitsubishi Pajero-Clutch master cylinder

1986 Mitsubishi Pajero clutch master cylinder: what it does and how to look after it

For the 1986 Mitsubishi Pajero (Gen I), a clutch master cylinder is fitted on manual-transmission models. This is confirmed by the Mitsubishi Factory Service Manual (1983–1991, Clutch section), the Haynes Mitsubishi Pajero/Montero 1983–1996 manual, and the Mitsubishi ASA parts catalogue, all of which show a hydraulic clutch system with a master and slave cylinder. Automatic models don’t use a clutch master cylinder.

On a manual ’86 Pajero, the clutch master cylinder turns the driver’s pedal input into hydraulic pressure, pushing fluid down to the slave cylinder to disengage the clutch. When it’s healthy, gear changes feel smooth and predictable. When it’s tired, the pedal may go soft or sink, gears get hard to select, and there may be fluid weeping at the firewall or a slowly dropping reservoir level.

Good servicing keeps it happy. Check the small clutch fluid reservoir regularly and top up with the specified DOT 3 or DOT 4 brake fluid. If the fluid is dark, gritty or low, plan a flush and bleed. As a rule of thumb for Aussie and Kiwi conditions, refreshing the fluid every two years is a smart move, especially if the vehicle sees beach runs, creek crossings, or dusty outback tracks.

• Common signs it needs attention: spongy pedal, difficulty engaging reverse or first, visible leaks, or fluid contamination.
• Nice-to-do while you’re there: inspect the rubber hose, pedal clevis pin and bush, pushrod boot, and the firewall area around the mounting for cracking.

Replacing the master is straightforward for a competent home spannerer. Use a flare-nut spanner on the hard line, protect paintwork from brake fluid, and bench-bleed the new unit before fitting. Once installed, bleed at the slave cylinder with a clear hose until clean, bubble-free fluid flows. Keep the reservoir topped up throughout. If the system is old, consider replacing the slave cylinder at the same time—doing both often restores a firm, consistent pedal. Finish by adjusting pedal height and free play to the workshop manual spec so the clutch bites where it should. A quality OEM or reputable aftermarket cylinder will give long service, and a quick check every few months keeps the Paj tidy and shifting sweet.

Popular questions

Does every 1986 Pajero have a clutch master cylinder?
Manual models do, as they use a hydraulic clutch with a master and slave cylinder as detailed in the factory and Haynes manuals. Automatic-transmission Pajeros don’t have or need a clutch master cylinder.

What fluid does the clutch master use, and how often should it be changed?
Use DOT 3 or DOT 4 brake fluid as specified in the workshop manual. Checking it at regular service intervals and flushing it roughly every two years helps prevent internal corrosion and keeps the pedal feel consistent.

How is the clutch bled after master cylinder replacement?
Bench-bleed the new master first, then bleed at the slave: keep the reservoir full, open the bleeder, have a helper press and hold the pedal, close the bleeder, and repeat until no bubbles appear. A clear hose on the bleeder makes it easy to see when the fluid runs clean and air-free.