Brakes help? -
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post #1 of 6 Old 06-27-2017, 10:24 PM Thread Starter
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1994 ZJ 
Join Date: Apr 2017
Location: Boulder
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Brakes help?

I'm trying to buy all the parts I need to replace my front and rear brakes, buying from Rock Auto. I'm trying to figure out if my rear drums are 9" or 10". I have a '94 Laredo with tow package, if that helps. Or if y'all could tell me how to figure it out, thank you!

Also if y'all have suggestions from Rock Auto for front and rear brakes/what all I need that'd also be much appreciated. I have a friend who is putting them in for me, I just gotta get everything that I need.

Blue Chewy the '94 ZJ Laredo; the hatch wiper sounds like baby Chewy :}
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post #2 of 6 Old 06-28-2017, 05:16 AM
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10", just did this on my 94 laredo. If it has the cooling fins on the drum its 10" but I 'think' only xj's got the 9" drums. I took mine off and measured them just to make sure.

I got the raybestos rear drums and they rub on the backing plate when turning. I took them off and ground down the edge of the backing plate and now they only rub when turning right at a good speed. So needless to say, dont buy raybestos rear drums. Think I got the AcDelco shoes and they seem to do ok... Hard to tell if the rear brakes are doing much. Go ahead and get new wheel cylinders, the kit that comes with new springs, the adjustment cable, adjuster, and the little arm that turns the adjuster.

For the front, I have EBC green stuff pads and Ebc rotors. So far they haven't warped...

1994 ZJ-I6 w/270,000 mi
1998 ZJ 5.9 w/66,000 mi Slate Black
2004 KJ w/108,000 mi
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post #3 of 6 Old 06-28-2017, 07:27 AM
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2008 JK Wrangler 
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Just can do a fairly easy junkyard-parts swap with a later model Grand Cherokee...and get rear disc brakes out of the deal...if you were so inclined.

Drum brakes are not the most efficient...and upgrading to disc brakes is not super-difficult, nor expensive.

Food for thought...


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post #4 of 6 Old 06-28-2017, 11:50 AM
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2004 WJ 
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Some real good info from jeepjeepster on 10" rear drums. I've seen the same thing where the 10" drums will have cooling fins/ribs on the outside of the drum where the 9" have the smooth outside drums.

Believe you need to determine if the brake work has been 'kept up to par' or neglected for a while? In other words do you need new rear drums, rear wheel cylinders, front rotors, front rebuilt calipers, etc.? And don't throw new front pads on it if the front rotors are grooved/warped since you're just wasting money.

I'm partial to front ceramic pads since no noise, dust, and don't groove the rotors. Some don't like them but I've been running them on all my Jeeps for 10+ years and don't have problems with them or in stopping.

Rockauto has the Wagner QC477 front ceramic pads for your 94 for $28. I've used these before and they work well.

On the rear I'd go with the Wagner thermoquiet PAB670 rear shoes for $22 on RA. These shoes are 10"x 1-3/4". Jeepjeepster may have to verify the depth of his 10" drums since I've read there may be a couple different widths of shoes depending on the drum depth.

Don't buy anything from Rockauto w/o using a discount code. Use one of the below codes at the top and enter it in the "How did you hear about us?" box at checkout. 5% off isn't much but every little bit helps. Good luck.

PS. If you do end up with a 5.5" lift and 35" tires you may have to go with high-performance everything if you come flying down out of Estes Park!

2004 4.7L WJ Limited, 96 4.0 ZJ

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post #5 of 6 Old 06-28-2017, 12:08 PM
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AFAIK all the ZJ's got the same 10" drum. The XJ had a lot of different drums but it also had four rear axles and 5 engines throughout production, it's a bit of a mess.

Trying to stop 35's with ZJ front discs and drums in the back is gonna be hilarious, I hope you're planning axle upgrades.

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post #6 of 6 Old 06-30-2017, 09:40 AM
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Yep that's why I limited our ZJ to 30" tires. The brakes on these, between the little 11" discs and single piston calipers, are pre-historic. We had brakes that good in 1972!! (our GM Full Size cars came with 11" discs up front, single piston sliding calipers) but compared to the all drum systems we had before that, we thought they were GREAT, lol.....

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brakes , drum brake , rotor

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