cruiser54 Posted April 14, 2016 Share Posted April 14, 2016 ZJ is totally different. Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 14, 2016 Share Posted April 14, 2016 ZJ is totally different. Yep. Link to comment Share on other sites More sharing options...
DirtyComanche Posted April 15, 2016 Share Posted April 15, 2016 You will realize more braking improvement on your MJ by changing to a dual diaphragm booster and master cylinder from a 99 to 2004 wJ than by adding rear disc brakes. Use a booster/master from a 95-96 XJ with the 1/4" spacer plate on your 91. Much easier, pure PnP, and works just as well. I put mine on without a spacer. I just had to roll the lip on the firewall a bit. There isn't good yards here for pulling things, so I ordered the whole booster off Rockauto for $19 or something (reman). I did have to modify things a bit to make the brake light switch work. Or maybe work. I should check that it's actually doing something still. :eek: Link to comment Share on other sites More sharing options...
DirtyComanche Posted April 15, 2016 Share Posted April 15, 2016 zj has a shorter rod? someone refresh my memory... was the 95/96 spacer plate to compensate for enginebay/firewall clearance, or to better adjust/lower the pedal? or both? if it was just to lower the pedal then this may not be an issue.... and actually be easier It's for firewall clearance primarily, I believe. Like I said, I just rolled the lip on mine to fix it. The pedal possibly is a little higher, but my pedals, seat, and floor are modded, so it's apples to bananas. Either my reman had the wrong rod in it, or you need the (later) adjustable brake light switch. I wound up grinding the rod a bit (too much) and then modified my switch to be adjustable. This added considerable time and I see zero mention of it anywhere else (it was a total surprise to me), so there's a good chance that my cheap reman was at least partly to blame. Edit, and if I wasn't a numpty I would have ground the rod correctly and saved a lot of time. Seriously, I own thousands of dollars of precision measuring equipment, and professionally work on critical components where tolerances are called out in tenths, and I chose to eyeball modifying the rod. :doh: Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 15, 2016 Share Posted April 15, 2016 The 95-96 master/booster is pure PnP only on 91 and 92 MJs. All that other stuff you had to do is only on the Renix junk., including the brake switch. And yes, the plate was for firewall clearance so you didn't have to beat down the lip. Link to comment Share on other sites More sharing options...
DirtyComanche Posted April 15, 2016 Share Posted April 15, 2016 The 95-96 master/booster is pure PnP only on 91 and 92 MJs. All that other stuff you had to do is only on the Renix junk., including the brake switch. And yes, the plate was for firewall clearance so you didn't have to beat down the lip. I'm thinking if you pulled it from a junkyard and stole the brake light switch and spacer it would make it a drop in. Might have to splice the wires for the connector if it is different. Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 15, 2016 Share Posted April 15, 2016 You would need the HO pedal assembly also to use the HO switch. Link to comment Share on other sites More sharing options...
DirtyComanche Posted April 15, 2016 Share Posted April 15, 2016 Ah, that is different. Link to comment Share on other sites More sharing options...
Megadan Posted April 15, 2016 Share Posted April 15, 2016 I remember seeing somewhere on here a person used the HO brake assembly with a 2 wire ford switch from an old pickup instead of the HO unit. Link to comment Share on other sites More sharing options...
DirtyComanche Posted April 15, 2016 Share Posted April 15, 2016 I remember seeing somewhere on here a person used the HO brake assembly with a 2 wire ford switch from an old pickup instead of the HO unit. You could install an early GM one. There's actually already one there, at least on my 89, I don't know what it's doing though and didn't feel like going back in the house to get the real wiring manual to find out. Zero mention of it in the Haynes manual. Link to comment Share on other sites More sharing options...
mikekaz1 Posted April 16, 2016 Author Share Posted April 16, 2016 Ah OK... so the spacer is a semi necessity. Wait... dirtyC, you got a booster for $19?! I'm sure that's like half the price the commies at the junk yard would get me for a used one! Link to comment Share on other sites More sharing options...
DirtyComanche Posted April 16, 2016 Share Posted April 16, 2016 Ah OK... so the spacer is a semi necessity. Wait... dirtyC, you got a booster for $19?! I'm sure that's like half the price the commies at the junk yard would get me for a used one! Yeah. Local parts store quoted me like $300 for a reman. I hit RockAuto that night and clicked really hard on the buy button. It was one of their distributor closeout sales, which are normally really good deals, but by the time it gets to me the return period will have passed. Not like I'm sending it back for that price anyways. :laughin: Link to comment Share on other sites More sharing options...
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