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Topic: master cylinder upgrade

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Posts: 8
master cylinder upgrade

      My MJ sat on the sidelines most of the summer with fuel issues.  As I now have them resolved and it runs good as new, I hop in to drive it around when my brake pedal goes right to the floor.  My fluid is full and I dont appear to have any leaks so I have to believe that if my drums are not siezed, my seals went bad in my master cylinder.

      It seems like this would be a great time to upgrade the master cylinder to something a little more stout, rather than rebuild or replace the stock piece.  We all know what a chore it is to slow our oversized tires on the street.  Has anyone upgraded their cylinder?  Are there good aftermarket ones, or how about something bigger from a fullsize rig?

'90 MJ
5 speed
6" Rusty's
35" BFG AT's
Optima Redtop
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Posts: 606

Its a popular upgrade to use a WJ master cylinder in an XJ. Check it out HERE. Not a direct bolt in, but certainly possible.

My Build Thread
4.5" Lift, 33" M/Ts, and Other Mods
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Posts: 1579
Welcome to GLXJ and your MJ looks sweeeet! Looks like you've tackled any rust thats accumulated...


My Fleet
1996 XJ "Snowball"- 3.5" lift, bunch of little mods.  I hate pegleg rear axles!
1974 AMC Javelin "Jade Grenade"- 360v8, 4sp, green inside and out. Underfunded Project.
2009 Kawsaki Vulan 900 "Rocket III"- Summer DD

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