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Old October 3rd, 2008, 05:00 PM   #1
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Default Yj Master Cylinder

I have 94 yj 44 front 1/2 ton calipers 60 rear 1/2 ton calipers.
Stock master cylinder and a very spongy brake pedal.
Any one change out M/C with some thing better.
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Old October 3rd, 2008, 08:47 PM   #2
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I'm having the SAME problem.. my pedal wont stiffen no matter how much its bled.

awaiting replys :)
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Old October 5th, 2008, 05:37 PM   #3
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Any Help Any One?
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Old October 5th, 2008, 07:10 PM   #4
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This is a great site. But to get much faster responses try posting over here http://www.jeepforum.com/forum/ .
I have full size axles under my YJ. I put a master cylinder of a 1978 mercury grand marquis on. I have some brake pedal but it's not great. They will lock up my 37" tires but the pedal don't feel great. I'm going to try eliminating my stock YJ proportioning valve. Then add a adjustable one for the rear. There are tons of rights ups on M/C upgrades for yj's if you google it. Here's one. http://www.pirate4x4.com/forum/archi.../t-272216.html


Good luck let me know if you figure out your situation it might help me also.
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Old October 5th, 2008, 07:29 PM   #5
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Quote:
Originally Posted by capone View Post
This is a great site. But to get much faster responses try posting over here http://www.jeepforum.com/forum/ .
I have full size axles under my YJ. I put a master cylinder of a 1978 mercury grand marquis on. I have some brake pedal but it's not great. They will lock up my 37" tires but the pedal don't feel great. I'm going to try eliminating my stock YJ proportioning valve. Then add a adjustable one for the rear. There are tons of rights ups on M/C upgrades for yj's if you google it. Here's one. http://www.pirate4x4.com/forum/archi.../t-272216.html


Good luck let me know if you figure out your situation it might help me also.
Thanks for the info
Did that marquis M/C bolt right up?
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Old October 5th, 2008, 07:29 PM   #6
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get a m/c for a 77 mercury grand marquis 4 wheel disc and hydroboost. this is the master cyl I run with my setup. it was a direct bolt on and the rod need not be shortened. (88 YJ). you'll have to swap the front and rear coil lines on going to the prop valve as they are reversed or make new ones. also I removed the oring from the prop valve. on 35's it stops great. with a firm pedal.
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Old October 5th, 2008, 07:50 PM   #7
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Quote:
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Thanks for the info
Did that marquis M/C bolt right up?
Yes it did bolt right up. But like ovrlnd said you have to switch your lines around. And it I did use the the same one ovrlnd described. I used 1978 Mercury grand marquis 4 wheel disc and hydroboost. I'm going to try to remove my o ring as ovrlnd described.

Here's the M/C I have http://www.partsamerica.com/ProductD...pe=230&PTSet=A

Here's another good post
http://www.jeepsunlimited.com/forums...d.php?t=790107

Last edited by capone; October 5th, 2008 at 08:07 PM.
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Old October 5th, 2008, 09:46 PM   #8
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OMFG

right in our JEEP FAQ's!!!!!!

http://www.greatlakes4x4.com/showthread.php?t=101034
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Old October 6th, 2008, 06:14 AM   #9
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OMFG

right in our JEEP FAQ's!!!!!!

http://www.greatlakes4x4.com/showthread.php?t=101034
Thanks for pointen that out Sandlas.
But the marquis m/c sounds better it bolts right up.
Unless Im missing something?
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Old October 6th, 2008, 07:26 AM   #10
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OMFG

right in our JEEP FAQ's!!!!!!

http://www.greatlakes4x4.com/showthread.php?t=101034
Yes I helped a friend put a E350 on his YJ. That is a common swap also. But I think the grand marquis one was easier. Besides that's the on KillerB recommended when I asked the same question as Buzz in the earlier this year.
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Old October 6th, 2008, 09:32 AM   #11
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Quote:
Originally Posted by capone View Post
This is a great site. But to get much faster responses try posting over here http://www.jeepforum.com/forum/

Yeah, that's great for getting 99 useless responses for every one that might be helpful. Very few people over there know what they are doing. Its a big n00b magnet.
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Old October 6th, 2008, 09:46 AM   #12
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Yeah, that's great for getting 99 useless responses for every one that might be helpful. Very few people over there know what they are doing. Its a big n00b magnet.
Why didn't you chime in 3 days ago. I was just trying to help the guy out.
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Old October 6th, 2008, 10:16 AM   #13
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when we did mine we got both the E350 and the 77 Grand Marquis. the E350 is not a bolt on and still disc/drum. not dissing the E350 swap but the Marquis is simpler.
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Old October 6th, 2008, 02:04 PM   #14
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I did the E350 on my YJ and it took 30 minutes. Not sure what issues your having, but I used a 86 E350 MC with a little grinding on the edges and it went right on. Even the rod was correctly adjusted. Stops great now. I'm running 4 wheel dics.
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Old October 6th, 2008, 02:34 PM   #15
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I did the grand marq'
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Old October 6th, 2008, 06:11 PM   #16
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Quote:
Originally Posted by capone View Post
Yes I helped a friend put a E350 on his YJ. That is a common swap also. But I think the grand marquis one was easier. Besides that's the on KillerB recommended when I asked the same question as Buzz in the earlier this year.
Every YJ I have put the GMarquis stops awesome, bypass the prop valve for the rear and put in an adjustable prop valve.
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Old October 6th, 2008, 06:29 PM   #17
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Quote:
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Every YJ I have put the GMarquis stops awesome, bypass the prop valve for the rear and put in an adjustable prop valve.
that is what i did! Running an adjustable JEGS brand. VERY NIIIIICE
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