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Unread 11-15-2013, 07:31 PM   #1
jeepn4life92
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1997 TJ Wrangler 
 
Join Date: Jul 2011
Location: Metuchen, nj
Posts: 425
what master cylinders are you guys running?

I'm currently in the planning and saving stages of my build up (which is based around an sm465 to 231/300 doubler with kp hpd60 and shaved 14b rolling on 41 inch tires) and have myself a little bit stumped in the master cylinder department. I see some guys upgrading to master cylinders out of 3/4 and full ton trucks when they upgraded to one ton axles and some guys either not touching them or just not mentioning it in their build threads....so I'm a little confused. If I have a kingpin hi pinion dana 60 front axle out of a 1990 f350 with stock brakes and a cucv 14b converted to discs running 3/4 calipers and rotors, what do I need to do (if anything) to run these brakes? And for what its worth, my brake system is going to get almost completely renovated regardless so I can remove the abs stuff from the system...

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Unread 11-16-2013, 08:31 AM   #2
jason m
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You could install your axles and hook your brakes up and try them first. I had the same combo for years and used the stock YJ master and locked up 39" Iroks.
When I swapped to a 60 rear steer I used the same combo ( just hung the calipers off the frame ) got done with the axle swap and my brakes sucked, couldn't figure out why.
I know now I had a bad caliper in the rear and I didn't notice it till I completed the swap.

So all that aside I say try your stock TJ master and see. If you have meh brakes then try swapping to a larger boar like the dodge 2500 truck master and if that still doesn't do it there is always hydro boast.

Jason.
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Unread 11-16-2013, 09:53 AM   #3
Jeepin72
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2005 TJ Wrangler 
 
Join Date: Apr 2009
Location: "The Kingdom", Colorado
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There is a lot out there by Blaine, Billavista, Mr. N, and a thread by Geberhard on Pirate on this issue.

I have dual piston Ford calipers up front on my HP 60. I had drum brakes on a 60 rear. The TJ MC worked better than the Dodge 2500 MC.

I now have Eldorado calipers on a 14 bolt in the rear. The Dodge 2500 MC is far better than the TJ MC with the Eldo's and/or the TJ MC with the drums. The best iteration was with the o-ring removed from the proportioning valve. The does mess with bias. I can nearly lock up 40's and my stopping distance is greatly improved.

Based on all of the reading I did, this is a temporary fix for me. I will be plumbing in hydroboost at some point. Hey, there are only so many hours to wrench and so much money to spend. I had the Dodge 2500 MC sitting on a shelf so I used it when I went to the 14 bolt.
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Last edited by Jeepin72; 11-16-2013 at 10:08 AM.. Reason: O-Ring
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Unread 11-20-2013, 10:22 PM   #4
SeaWulf
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Join Date: Dec 2008
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I have a Corvette MC on my CJ with discs front and rear, no booster. On 38.5 swampers the braking power is more than enough to lock up the tires if you really put all your weight on it.
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