THE XJ/MJ/ZJ/WJ master cylinder upgrade thread, what works, no questions. - Page 4

Bubba_Jeep · 05-17-2009, 05:13 PM

Quote:

Originally Posted by rcmf5525

-----
BTW, the '77-'78 Grand marquis 4 wheel disc MC is passenger side output and no modification needed, it bolts right up. Bore size is 1".

The Grand Marque MC I used has a 1.125 bore. But your correct on "bolting right up".

JeepFreak21 · 05-17-2009, 05:20 PM

Quote:

Originally Posted by Bubba_Jeep

The Grand Marque MC I used has a 1.125 bore. But your correct on "bolting right up".

That would make more sense.

I went with the Vette MC because I was sick and tired of researching... I'd used it before and it worked well and it was cheap, so I ordered it again.

Billy

rcmf5525 · 05-17-2009, 05:28 PM

Yep, 1.125". Wow, I guess I was looking at the 2 wheel disc MC specs this whole time! Worried me, I had to go out and make sure that I actually have the 4 wheel disc variant... Im good...

myjeepsbigger · 11-07-2009, 06:12 PM

Did mine today. Been 'getting by' with my factory XJ master cylinder, even though I have 1 ton axles/brakes.

Im running a factory 86 XJ booster, 86 E350 master cylinder with the bolt holes elongated to match the booster, eliminated the combination valve. My front calipers are dual piston 88 F350 on a D60, rear is (unfortunately) still the F350 drums on a Sterling rear. As long as the rear shoes are adjusted properly, it now stops on a dime.

NCGamedog · 11-08-2009, 06:29 AM

For my 1991 MJ we used a 1996 XJ master/booster/proportioning valve. It was a direct replacement and allowed me to eliminate the rear Load Sensitive Prop Valve. I was able to reuse one of the hard lines running to the rear, just hooked it up to the proper port on the XJ valve.

Dingo509 · 11-09-2009, 12:21 AM

This thread was VERY helpful to me so here's whats' working so far for me.

91 XJ pedal
95 XJ Dual booster
99 Ram3500 VAN 1 1/4 bore (the van is shorter than the truck)
Howe Racing twin piston front calipers. Dual 2.125" pistons on 75 Chev rotors
Gm metric rear calipers on 88 Chev light duty rotors.
SSBC rear adjustable proportioning valve, run full open, might remove it.

I had the setup in the rear with the stock 91 single booster/merc M/C with single piston 75 Chev calipers in the front, and the rears worked great but the front was lacking. And the pedal was always low. So I tried this setup. So far its OK, everything works great, but you need alot more pedal pressure now. Might try a durango M/C later.

Dingo

05-17-2009, 05:28 PM	#78
rcmf5525 Registered User Join Date: Nov 2007 Member # 102687 Location: El fuckin Paso w/o my rig; FML Posts: 200	Yep, 1.125". Wow, I guess I was looking at the 2 wheel disc MC specs this whole time! Worried me, I had to go out and make sure that I actually have the 4 wheel disc variant... Im good... __________________ People sleep peaceably in their beds because rough men stand ready to do violence on their behalf

11-08-2009, 06:29 AM	#80
NCGamedog Registered User Join Date: Jun 2004 Member # 32055 Location: union grove,NC Posts: 431	For my 1991 MJ we used a 1996 XJ master/booster/proportioning valve. It was a direct replacement and allowed me to eliminate the rear Load Sensitive Prop Valve. I was able to reuse one of the hard lines running to the rear, just hooked it up to the proper port on the XJ valve. __________________ 1991 MJ, AX-15/231, D30/D44, MT/R's...more to come.

11-09-2009, 12:21 AM	#81
Dingo509 Registered User Join Date: Jan 2005 Member # 41726 Location: Washington Posts: 1	This thread was VERY helpful to me so here's whats' working so far for me. 91 XJ pedal 95 XJ Dual booster 99 Ram3500 VAN 1 1/4 bore (the van is shorter than the truck) Howe Racing twin piston front calipers. Dual 2.125" pistons on 75 Chev rotors Gm metric rear calipers on 88 Chev light duty rotors. SSBC rear adjustable proportioning valve, run full open, might remove it. I had the setup in the rear with the stock 91 single booster/merc M/C with single piston 75 Chev calipers in the front, and the rears worked great but the front was lacking. And the pedal was always low. So I tried this setup. So far its OK, everything works great, but you need alot more pedal pressure now. Might try a durango M/C later. Dingo Last edited by Dingo509; 11-09-2009 at 12:23 AM. Reason: added proportioning valve specs

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

11-07-2009, 06:12 PM	#79
myjeepsbigger Registered User Join Date: Jul 2004 Member # 33427 Location: Illinois Posts: 148	Did mine today. Been 'getting by' with my factory XJ master cylinder, even though I have 1 ton axles/brakes. Im running a factory 86 XJ booster, 86 E350 master cylinder with the bolt holes elongated to match the booster, eliminated the combination valve. My front calipers are dual piston 88 F350 on a D60, rear is (unfortunately) still the F350 drums on a Sterling rear. As long as the rear shoes are adjusted properly, it now stops on a dime.