CptVanGuard Posted April 24, 2019 Share Posted April 24, 2019 The master cylinder on my 1987 MJ went out, and I am trying to swap it out. Everything has gone fine, until it was time to take the brake lines off the old master cylinder. I quickly learned that the fitting was completely seized and would not move. My father and I actually broke the fitting while trying to get it off with vice grips. I now need to buy a short brake line and fittings, and I was going to undo it from the proportioning valve. My main issue now is that I don't know what the size the line is. I've heard it may be 1/4, since it comes straight from the master cylinder into the proportioning valve, but I'm not certain. I also have no idea on how to find the correct brake line fittings. Any advice would be appreciated. Link to comment Share on other sites More sharing options...
Geek Posted April 26, 2019 Share Posted April 26, 2019 I would take any of the brake line that is left to the auto parts store and match it up. I believe it is all 3/16 line but I could be wrong on that. Link to comment Share on other sites More sharing options...
Eagle Posted April 26, 2019 Share Posted April 26, 2019 It is all 3/16" line, but a couple of the fittings at the front distribution block are oversized. Link to comment Share on other sites More sharing options...
CptVanGuard Posted April 26, 2019 Author Share Posted April 26, 2019 It is all 3/16" line, but a couple of the fittings at the front distribution block are oversized. Alrighty then. Thanks for helping me sort all this out. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
JeepSchmidt O'Guinness Posted April 26, 2019 Share Posted April 26, 2019 Don't forget our distribution blocks require a special bleed procedure, Unless you do have a proportioning valve in the engine bay. Link to comment Share on other sites More sharing options...
CptVanGuard Posted April 26, 2019 Author Share Posted April 26, 2019 Don't forget our distribution blocks require a special bleed procedure, Unless you do have a proportioning valve in the engine bay. There is one the the engine bay. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Eagle Posted April 27, 2019 Share Posted April 27, 2019 2 hours ago, CptVanGuard said: There is one the the engine bay. Not if your MJ is stock. The stock MJ "thingie" below the master cylinder is not a proportioning valve. It has no proportioning function. It's a distribution block and a brake failure warning light switch, and that's all it is. Link to comment Share on other sites More sharing options...
CptVanGuard Posted April 27, 2019 Author Share Posted April 27, 2019 Not if your MJ is stock. The stock MJ "thingie" below the master cylinder is not a proportioning valve. It has no proportioning function. It's a distribution block and a brake failure warning light switch, and that's all it is. Ah. Gotcha. That is what it is. Thanks. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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