As I am getting several pm's end e-mails about my setup, hope this helps.
This approach was a bit easier than the E350, with killer results.
A great E350 write-up from Lopy is on this link:
For background, YJ, 60 front dual piston caliper, 14 bolt rear, (3/4 ton Chevy fronts, single piston).
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After converting the rear to disk brakes, the stock MC was really having to do double shift to stop the rig. I compared both E350 and Dodge MC master cylinders, and test fit both on a YJ stock booster and a TJ stock booster. The Dodge seemed like a closer fit, and easier to lightly modify.
I used a 99 and up Dodge RAM 2500 (I believe the 3500 is the same part), and with killer results! Can lock 40" tires without any problems. I think even when the Jeep had 31" tires I was never able to stop this fast!
info copied from my build thread:
Got the Ram 2500 MC, about $70 at my door in one day, not bad at all
kragen.com or rockauto.com. shop around.
After doing the 14 bolt disc brake conversion, my stock MC did not have enough juice for the front dual piston calipers, and the rear calipers. I could lock the 40’s with a couple pumps or standing on the brake pedal, so not ideal. I looked at a few options for the upgrade, either a E350 MC or a Dodge Ram 2500.
The E350 needs minor modifications to work on the rig, but will also require reflaring a few lines, or adaptors. The Dodge Ram 2500 is a straight forward almost bolt on for a TJ, but it will not directly fit on a YJ booster flange. PIcs of the Ram 2500 and TJ booster below:
Picture of the Dodge Ram 2500 MC compared to a TJ stock MC.
![Image]()
The next change will be extending the booster push rod. Here is a pic of the stock push rod screw. It has enough length that it could just be pushed all the way out. I gota bigger grade 8 bolt at the hardware store I will modify (cut head and grid to fit MC).
![Image]()
Mocking up the setup:
![Image]()
I was planning to use a TJ booster, however the booster is longer than the YJ, so once the MC is mounted, it would not clear the hood. One option is to fabricate the booster mount bringing it closer to the firewall, and relocate the clutch slave reservoir which would interfere.
I went with another option, modifying the MC to fit the YJ booster. It required minor grinding of the RAM MC flange until it fit the YJ booster. If doing this approach, grind carefully the excess material until it fits. I need to make some lines with new fittings as the YJ’s are slightly different. To clarify, teh TJ lines will bolt on. I am contemplating using the stock TJ lines from the stcok TJ MC to the stock TJ proportioning valve, rather than having to deal with a lot of bending and reflarring of lines.
This approach was a bit easier than the E350, with killer results.
A great E350 write-up from Lopy is on this link:
For background, YJ, 60 front dual piston caliper, 14 bolt rear, (3/4 ton Chevy fronts, single piston).
After converting the rear to disk brakes, the stock MC was really having to do double shift to stop the rig. I compared both E350 and Dodge MC master cylinders, and test fit both on a YJ stock booster and a TJ stock booster. The Dodge seemed like a closer fit, and easier to lightly modify.
I used a 99 and up Dodge RAM 2500 (I believe the 3500 is the same part), and with killer results! Can lock 40" tires without any problems. I think even when the Jeep had 31" tires I was never able to stop this fast!
info copied from my build thread:
Got the Ram 2500 MC, about $70 at my door in one day, not bad at all
kragen.com or rockauto.com. shop around.After doing the 14 bolt disc brake conversion, my stock MC did not have enough juice for the front dual piston calipers, and the rear calipers. I could lock the 40’s with a couple pumps or standing on the brake pedal, so not ideal. I looked at a few options for the upgrade, either a E350 MC or a Dodge Ram 2500.
The E350 needs minor modifications to work on the rig, but will also require reflaring a few lines, or adaptors. The Dodge Ram 2500 is a straight forward almost bolt on for a TJ, but it will not directly fit on a YJ booster flange. PIcs of the Ram 2500 and TJ booster below:
Picture of the Dodge Ram 2500 MC compared to a TJ stock MC.
The next change will be extending the booster push rod. Here is a pic of the stock push rod screw. It has enough length that it could just be pushed all the way out. I gota bigger grade 8 bolt at the hardware store I will modify (cut head and grid to fit MC).
Mocking up the setup:
I was planning to use a TJ booster, however the booster is longer than the YJ, so once the MC is mounted, it would not clear the hood. One option is to fabricate the booster mount bringing it closer to the firewall, and relocate the clutch slave reservoir which would interfere.
I went with another option, modifying the MC to fit the YJ booster. It required minor grinding of the RAM MC flange until it fit the YJ booster. If doing this approach, grind carefully the excess material until it fits. I need to make some lines with new fittings as the YJ’s are slightly different. To clarify, teh TJ lines will bolt on. I am contemplating using the stock TJ lines from the stcok TJ MC to the stock TJ proportioning valve, rather than having to deal with a lot of bending and reflarring of lines.
