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Old 06-03-2018, 05:32 PM
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87 YJ drums to disc

I have an 87 YJ what year parts do I need to convert from drums to discs all around? If not all 4 wheels at least the front. I see the kits for the rear from Quadratec but I don't want to spend that much money if parts from another Jeep will work.

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Old 06-03-2018, 08:04 PM   #2
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So yours has drums on the front? I didn't think they had did front drums for a long time. Mine is a 89 and it is stock disk on the front drum on the back and I am ok with that set up. Might be easier to pick up a front that has the disk already there, I see them on craigslist all the time. Good luck with the project.

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Old 06-03-2018, 08:21 PM   #3
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So yours has drums on the front? I didn't think they had did front drums for a long time. Mine is a 89 and it is stock disk on the front drum on the back and I am ok with that set up. Might be easier to pick up a front that has the disk already there, I see them on craigslist all the time. Good luck with the project.



He wants disc brakes in the rear, i know it has been done but idk what the common swap it i know grands had discs in the rear. I have never been interested in upgrading an axle not worth upgrading lol.
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Old 06-03-2018, 09:29 PM   #4
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Well you've got a couple options;
Find a YJ part out (rusty frame is pretty common) & get the disc brake parts from it.
Another option would be to get a conversion kit. G2 as well as others offer kits.
But here's the rub;
As @agalloch07 stated, upgrading the stock axles isn't the best option if you plan to off road/upgrade your jeep with larger tires (35" or bigger).
In that case, an axle swap that already has disc brakes would be ideal.
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Old 06-03-2018, 09:56 PM   #5
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He wants disc brakes in the rear, i know it has been done but idk what the common swap it i know grands had discs in the rear. I have never been interested in upgrading an axle not worth upgrading lol.
I must have read it wrong, sounded like if he wanted disk all the way around but if he couldn't get disk on the back then at least get them on the front. My bad.
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Old 06-03-2018, 11:33 PM   #6
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I must have read it wrong, sounded like if he wanted disk all the way around but if he couldn't get disk on the back then at least get them on the front. My bad.
No, that is exactly what he said....

O/P you should already HAVE discs on the front... if you don't then someone has swapped in some really old axles.... going from drum to disc in the rear really doesn't gain you anything other than easier pad changes
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Old 06-04-2018, 12:34 PM   #7
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Gains better stopping power, especially in wet weather. Which is the reason that once they solved the problem of parking brake application, everyone went rear discs. Early adopters of disk brakes had some funky PB applications.
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Old 06-04-2018, 09:06 PM   #8
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^ debatable

Having driven tj's w both factory disc and factory drums on the back, both w 33's I wouldn't pay the money to swap.
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Old 06-12-2018, 12:57 PM   #9
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Just swap the rear axel with 8.8...get the right years and they come with discs...and you can order the correct PB cable...disc in the rear dont make that big of difference if u dont swap the MC...the small resivior for the drums doesn't move enough fluid to take full advantage of disc in the rear.
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Old 06-19-2018, 04:00 PM   #10
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Better stopping power won't be had from going to discs in the rear. I've done the swap. It's great for a better parking brake, and easier maintenance. There is no difference in stopping power and you don't want a lot of power in the rear anyways. Increasing the power in the rear too much will cause you to pop a 180 in the street if you ever locked up the rear.

An 87-90 can't do a disc brake conversion as the axles are not c-clip axles and they have a different axle bolt pattern at the end of the wheels (no, not the wheel bolt pattern, but the 4-bolt pattern at the end of the tubes). I normally don't even recommend the 8.8 swap but to get disc brakes that's the easiest candidate for an 87-90 YJ.

For 91-95 it depends on the tire size and route you want to go as to predict what I'd suggest should be done with it.
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Old 06-20-2018, 02:06 AM   #11
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Increasing the power in the rear too much will cause you to pop a 180 in the street if you ever locked up the rear.
I think it's the other way around. I once put studded snow tires on the front of a front wheel drive car but not the rear. That night on the way home on an icy, but wide street with no traffic I tried them out. It did a beautiful 180 and then stopped straight. The front stopped more than the rear and around she went. The next day I had studded snow tires put on the rear as well. I ran them for 6 or 7 winters (two sets of wheels with two different tires, one for winter, one for summer).
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Old 06-20-2018, 06:09 AM   #12
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No.... it spun out because the rear brakes exceeded traction available while the fronts did not....
Increasing rear brake power absolutely does make a spinout while braking more likely...

Just ask the honda kids why they like the parking brake so much
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Old 06-21-2018, 12:13 AM   #13
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I think it's the other way around. I once put studded snow tires on the front of a front wheel drive car but not the rear. That night on the way home on an icy, but wide street with no traffic I tried them out. It did a beautiful 180 and then stopped straight. The front stopped more than the rear and around she went. The next day I had studded snow tires put on the rear as well. I ran them for 6 or 7 winters (two sets of wheels with two different tires, one for winter, one for summer).
You have it backwards. I have a big brake kit in which I can lock up my tires back to back virtually infinitely as many times in a row as I want. I have done so quite a few times just to see what my stopping capability is in various situations.

No matter what terrain, locked up front tires go straight. You can be sliding with your front brakes locked and you can turn the wheel left and right while locked and you will remain straight. The whole purpose of anti-lock braking in vehicles that have it is to keep the wheels from locking so you can turn.

If your rears lock up, your rear end will swing around. The whole job of a combination valve (incorrectly referred to by many as a proportion valve) is to limit fluid to the rear so that rear brakes do NOT lock up.

Go ride a bicycle with strong enough front and rear brakes on wet concrete or asphalt. Play around with the rear brake and then turn your handlebars a bit when the rear wheel locks up. Good luck not spinning around and falling off the bike.

Or, if you really want to prove my point, go drive down the road and pop your parking brake during rain. See where that ends you up. I don’t think you’ll like the outcome.

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