Symptoms
A soft or sinking clutch pedal, fluid on the firewall, or electrical faults from fluid dripping into the fuse box below. Comanche Club members also recommend checking the clutch-pedal welds, which some owners found incomplete and cracked.
The fix, step by step
- Clean any brake fluid off the fuse box and connectors right away.
- Disconnect the pushrod at the pedal, unbolt the master cylinder from the firewall and remove it with the line.
- Bleed the hydraulics after fitting, following the part's instructions.
- Check the pedal pivot and welds while you're under the dash.
Tools & part numbers
- Sockets and extensions
- flare-nut wrench
- flashlight
- brake cleaner
- DOT 3 fluid
Where to buy the parts
Crown 53004467 clutch master cylinder, 1987–90 XJ & MJQuadratec ↗Amazon ↗
Crown XY8990SA clutch master kit, 1989–90 YJ/XJ/MJ 6-cylQuadratec ↗Amazon ↗
Crown XY1992S clutch master kit, 1992 XJ & MJ 4.0LQuadratec ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Jeep Comanche MJ parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.