Rear disc swap. My thoughts.
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Seasoned Member
Joined: Aug 2017
Posts: 273
Likes: 14
From: Southwest Arkansas
Year: 1994
Model: Cherokee(XJ)
Engine: 4.0
Rear disc swap. My thoughts.
Just finished up the rear liberty 8.25 disc brake swap on my 94. Holy crap. Hella brakes now.
I did have to open the axle holes up a little, maybe the newer 8.25 tubes are smaller?
I had to use some grade 8 bolts and grind a flat spot on the heads to clear the axle tubes because like an idiot I didn’t get the studs for the backing plates. But the install went easy. Found some parking brake cables, rt offorad part #RT31039 that fit perfect. I do need to modify the lever to make it have more throw, because they engage all the way at the top, I like it about 3/4 of the way.
when I first did it I didn’t change the proportion piston, spring and cap, the rear brakes was about 30 degrees hotter than the front and wasn’t grabbing like they should, swapped those parts from a Zj disc brake prop valve and re-bled the rears then all 4 corners was 3 degrees of each other.
before the swap when I hit the brakes it would nose dive, and barely stop. Now the whole jeep squats and stops like a newer car.
100% worth the time and about $200 I’ve got in it, junkyard backing plates, new calipers, new rotors, parking brake pads and cables.
I did have to open the axle holes up a little, maybe the newer 8.25 tubes are smaller?
I had to use some grade 8 bolts and grind a flat spot on the heads to clear the axle tubes because like an idiot I didn’t get the studs for the backing plates. But the install went easy. Found some parking brake cables, rt offorad part #RT31039 that fit perfect. I do need to modify the lever to make it have more throw, because they engage all the way at the top, I like it about 3/4 of the way.
when I first did it I didn’t change the proportion piston, spring and cap, the rear brakes was about 30 degrees hotter than the front and wasn’t grabbing like they should, swapped those parts from a Zj disc brake prop valve and re-bled the rears then all 4 corners was 3 degrees of each other.
before the swap when I hit the brakes it would nose dive, and barely stop. Now the whole jeep squats and stops like a newer car.
100% worth the time and about $200 I’ve got in it, junkyard backing plates, new calipers, new rotors, parking brake pads and cables.
Newbie
Joined: Jan 2024
Posts: 3
Likes: 2
From: AZ
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
Just finished up the rear liberty 8.25 disc brake swap on my 94. Holy crap. Hella brakes now.
I did have to open the axle holes up a little, maybe the newer 8.25 tubes are smaller?
I had to use some grade 8 bolts and grind a flat spot on the heads to clear the axle tubes because like an idiot I didn’t get the studs for the backing plates. But the install went easy. Found some parking brake cables, rt offorad part #RT31039 that fit perfect. I do need to modify the lever to make it have more throw, because they engage all the way at the top, I like it about 3/4 of the way.
when I first did it I didn’t change the proportion piston, spring and cap, the rear brakes was about 30 degrees hotter than the front and wasn’t grabbing like they should, swapped those parts from a Zj disc brake prop valve and re-bled the rears then all 4 corners was 3 degrees of each other.
before the swap when I hit the brakes it would nose dive, and barely stop. Now the whole jeep squats and stops like a newer car.
100% worth the time and about $200 I’ve got in it, junkyard backing plates, new calipers, new rotors, parking brake pads and cables.
I did have to open the axle holes up a little, maybe the newer 8.25 tubes are smaller?
I had to use some grade 8 bolts and grind a flat spot on the heads to clear the axle tubes because like an idiot I didn’t get the studs for the backing plates. But the install went easy. Found some parking brake cables, rt offorad part #RT31039 that fit perfect. I do need to modify the lever to make it have more throw, because they engage all the way at the top, I like it about 3/4 of the way.
when I first did it I didn’t change the proportion piston, spring and cap, the rear brakes was about 30 degrees hotter than the front and wasn’t grabbing like they should, swapped those parts from a Zj disc brake prop valve and re-bled the rears then all 4 corners was 3 degrees of each other.
before the swap when I hit the brakes it would nose dive, and barely stop. Now the whole jeep squats and stops like a newer car.
100% worth the time and about $200 I’ve got in it, junkyard backing plates, new calipers, new rotors, parking brake pads and cables.
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