Brake Rotors - Help

Luny421 · **Posted:** Thu Aug 02, 2012 2:31 pm

I'm looking to replace my rotors on my 08 Sport... I'm going to go with EBC rotors, but they have 2 different sizes that they say will fit. the first, item #GD7205 is a 11.3" diameter rotor, the other item #GD7444 is a 11.9" diameter. Do i have to use one or the other specifically, or just pick whichever? The descriptions don't indicate fitment differences (e.g. one for 4wd, one for rwd). Any help is appreciated.

isomswim · **Posted:** Thu Aug 02, 2012 4:20 pm

One might be front and the other rear. how many miles on rotors if not a lot might be ok to have them remilled (proper word?)

Update: When you google the two numbers the later of the two is for the nitro/liberty and the former is for the 02-07 liberty. But thats by google terms

Luny421 · **Posted:** Fri Aug 03, 2012 4:35 pm

I've put about 15k miles on them since i bought it (i'm just shy of 55k on the Jeep), but they were warped when i bought it. It seems like the dealership just slapped some new pads on there and didn't turn the rotors, so they need replaced at this point. Both of those item #'s are for the front, but i did notice the GD7444 was listed for a nitro, but it says they fit a 2008 liberty...

isomswim · **Posted:** Fri Aug 03, 2012 5:26 pm

Searching summit racing I found these results.
http://www.summitracing.com/search/Depa ... Rank%7cAsc
A few good results there. Honestly slotted and drilled is a little over kill for a large suv unless you are taking it to the track every weekend. I would go with the UPR7205 for $75. :2cents:

Jeepin_it_real · **Posted:** Fri Aug 03, 2012 7:28 pm

For wheeling drilled and slotted help to cool cause you are often on the brakes to control your movement

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tjkj2002 · **Posted:** Fri Aug 03, 2012 10:43 pm

Jeepin_it_real wrote:

For wheeling drilled and slotted help to cool cause you are often on the brakes to control your movement

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No they just get clogged with mud and other junk which drastically shortens pad life.They offer zero cooling ability and actually increase brake temps due to less material to disapate heat.

Mike08Liberty · **Posted:** Sat Aug 04, 2012 9:24 am

Jeepin_it_real wrote:

For wheeling drilled and slotted help to cool cause you are often on the brakes to control your movement

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A little off ... Even if your rock crawling you brakes won't heat up that much. Your rotor movement is very minimal when going slow so there isn't that much friction to produce heat. Also ask TJKJ said one good drive though some thick mud and all the holes and slots will be filled up. Drilled and Slotted are designed to stop high speed vehicles. When going at a high rate of speed and then hitting your brakes you produce a large amount of friction and heat and being able to dissipate that is a plus. Thats why a Porsche comes with drilled and slotted rotors and not a Jeep Wrangler.

tjkj2002 · **Posted:** Sat Aug 04, 2012 8:52 pm

Mike08Liberty wrote:

Jeepin_it_real wrote:

For wheeling drilled and slotted help to cool cause you are often on the brakes to control your movement

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A little off ... Even if your rock crawling you brakes won't heat up that much. Your rotor movement is very minimal when going slow so there isn't that much friction to produce heat. Also ask TJKJ said one good drive though some thick mud and all the holes and slots will be filled up. Drilled and Slotted are designed to stop high speed vehicles. When going at a high rate of speed and then hitting your brakes you produce a large amount of friction and heat and being able to dissipate that is a plus. Thats why a Porsche comes with drilled and slotted rotors and not a Jeep Wrangler.

Drilled rotors are for weight reduction,nothing else.Worsens brake performance since modern pads do not outgas like older pads.The big 3 racing leagues(NASCAR,Formula 1,and Indy) do not use drilled rotors anymore since better braking is achieved from solid blanks.Slotted rotors can be good for the track but worthless on the street and trail.

Mike08Liberty · **Posted:** Sun Aug 05, 2012 1:03 am

tjkj2002 wrote:

Mike08Liberty wrote:

Jeepin_it_real wrote:

For wheeling drilled and slotted help to cool cause you are often on the brakes to control your movement

Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

A little off ... Even if your rock crawling you brakes won't heat up that much. Your rotor movement is very minimal when going slow so there isn't that much friction to produce heat. Also ask TJKJ said one good drive though some thick mud and all the holes and slots will be filled up. Drilled and Slotted are designed to stop high speed vehicles. When going at a high rate of speed and then hitting your brakes you produce a large amount of friction and heat and being able to dissipate that is a plus. Thats why a Porsche comes with drilled and slotted rotors and not a Jeep Wrangler.

Drilled rotors are for weight reduction,nothing else.Worsens brake performance since modern pads do not outgas like older pads.The big 3 racing leagues(NASCAR,Formula 1,and Indy) do not use drilled rotors anymore since better braking is achieved from solid blanks.Slotted rotors can be good for the track but worthless on the street and trail.

You really can't loop F1 in that because their brakes are Carbon Composite and are as light as they come and disapate heat better then anything else.

Luny421 · **Posted:** Mon Aug 06, 2012 11:46 am

alright, so EBC OE replacements it is...thanks for the info, and for saving me some $$$

Roastbeef · **Joined:** Sun Jun 03, 2012 7:31 pm **Posts:** 199

Well what about if you're not always on the mud? What about towing or regular street driving? Is it safe to say that they maybe worse in mud but perform better in street and towing situations? It so why buy something that doesn't perform as good where you need it?

tjkj2002 · **Posted:** Mon Aug 06, 2012 9:52 pm

Roastbeef wrote:

Well what about if you're not always on the mud? What about towing or regular street driving? Is it safe to say that they maybe worse in mud but perform better in street and towing situations? It so why buy something that doesn't perform as good where you need it?

If your drag racing then use them for rotating weight reduction,besides that they offer zero gains but they do a fine job making your wallet lighter.

Roastbeef · **Joined:** Sun Jun 03, 2012 7:31 pm **Posts:** 199

tjkj2002 wrote:

Roastbeef wrote:

Well what about if you're not always on the mud? What about towing or regular street driving? Is it safe to say that they maybe worse in mud but perform better in street and towing situations? It so why buy something that doesn't perform as good where you need it?

If your drag racing then use them for rotating weight reduction,besides that they offer zero gains but they do a fine job making your wallet lighter.

So they don't help cool by allowing air in and brake dust to escape? Which would cause brakes to stick if overheated?

tjkj2002 · **Posted:** Mon Aug 06, 2012 10:32 pm

Roastbeef wrote:

So they don't help cool by allowing air in and brake dust to escape? Which would cause brakes to stick if overheated?

No help with cooling.The rotors overall mass and the vanes cool the rotor,drilled rotors take away from the very material that helps the braking system to cool and function properly(absorb and disapate heat caused by friction).Pads these days do not outgas,no need to have a escape route.If your overheating your brakes it's user error and/or there is another problem with the braking system causing it.Fix the problem and learn how to drive,drive in the limits of said vehicle,a Jeep is not a Indy race car so drive/brake accordingly.

Roastbeef · **Joined:** Sun Jun 03, 2012 7:31 pm **Posts:** 199

tjkj2002 wrote:

Roastbeef wrote:

So they don't help cool by allowing air in and brake dust to escape? Which would cause brakes to stick if overheated?

No help with cooling.The rotors overall mass and the vanes cool the rotor,drilled rotors take away from the very material that helps the braking system to cool and function properly(absorb and disapate heat caused by friction).Pads these days do not outgas,no need to have a escape route.If your overheating your brakes it's user error and/or there is another problem with the braking system causing it.Fix the problem and learn how to drive,drive in the limits of said vehicle,a Jeep is not a Indy race car so drive/brake accordingly.

Why is everyones go to learn how to drive? It has nothing to do with my driving it's the other people I'm worried about, if towing a travel trailer with a small jeep that is. I will give you that one, cross drilling has nothing to do with cooling and in someways it even takes from the braking ability. I don't feel the slotted portion is anything but an improvement

tjkj2002 · **Posted:** Tue Aug 07, 2012 12:19 am

Slotted can be useful but not a DD vehicle,even on a sports car.

Luny421 · **Posted:** Fri Aug 10, 2012 4:49 pm

a little off topic, but i've been informed that the 11.3" rotors are for the KJ and the 11.9" rotors are for the KK...fwiw

Marlon_JBT · **Posted:** Sat Aug 11, 2012 12:57 pm

Luny421 wrote:

a little off topic, but i've been informed that the 11.3" rotors are for the KJ and the 11.9" rotors are for the KK...fwiw

I thought the rotors were a tad bit bigger than the KJ rotors when looking at them. It makes sense for the slightly heavier weight and increased size of the KK.

Brake Rotors - Help

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