Slotted/drilled rotors worth it? - JeepForum.com
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post #1 of 16 Old 05-11-2021, 05:00 AM Thread Starter
terrible
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Slotted/drilled rotors worth it?

My TJ is due for some brakes. My front rotors are showing some bad scoring and the rear pads have about a 1/16th" of life left.

I am on 35" tires and a 4" lift. The only time I have any issues with stopping power is in the rain or after some wheeling with mud. I installed stainless flex lines a few years ago on the front and my 8.8 has had them since I installed it.

Would slotted or and/or drilled rotors help with braking performance in a TJ? I know the perforations are mostly for gas build up and heavy braking but are they beneficial with stuff like mud and water?

I plan on doing a much needed hardware upgrade at the same time (pins, boots and sliders)

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post #2 of 16 Old 05-11-2021, 07:04 AM
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negative, its quite the opposite. the slots and holes get caked with mud and prevent heat dissipation.

there's minimal if any benefit to slotted/drilled rotors unless the vehicle is running around a track and constantly braking heavily. 99% of the cars they are put on see no advantage.

for more power while breaking, look into black magic pads and centric premium rotors on the front axle. IMO, they are a bare minimum for 35's and stop as good if not better than OEM brakes with OEM tire sizes.

side note, dont compress the caliper piston before changing the break fluid. TJ calipers are known for sticking if the fluid isnt clean and the pistons are compressed.


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post #3 of 16 Old 05-11-2021, 07:42 AM
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BM brakes or nothing.
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TheBoogieman is a jerk.
2003' Rubicon/Zone 4.25" combo lift with Rancho RS5000X shocks/ Zone hydro shocks/5.13 gears/35" Mickey Thompson MTZ P3 tires/Black Magic brakes. Jeep #17 & 19.
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post #4 of 16 Old 05-11-2021, 04:00 PM
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X2, avoid drilled/slotted rotors in our Jeeps. And X2 to the above recommendation for www.blackmagicbrakes.com who is the absolutely the best provider of high performance brakes and brake kits for our Wranglers. I've been running their Big Brake Kit brakes on two TJ for at least 15-16 years now which upgrades the calipers from single to dual pistons, better rotors, and far better brake pads.
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post #5 of 16 Old 05-11-2021, 05:16 PM Thread Starter
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X2, avoid drilled/slotted rotors in our Jeeps. And X2 to the above recommendation for www.blackmagicbrakes.com who is the absolutely the best provider of high performance brakes and brake kits for our Wranglers. I've been running their Big Brake Kit brakes on two TJ for at least 15-16 years now which upgrades the calipers from single to dual pistons, better rotors, and far better brake pads.
I don't really think I need anything bigger. Being a standard I use the engine to slow a lot and traffic around here is minimal. Not like I'm towing with it

Are the BM rotors coated? If I'm spending the money on something nice I'd like them to nut rust on the hats like cheap advance/zone rotors.
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post #6 of 16 Old 05-11-2021, 07:34 PM
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I don't really think I need anything bigger. Being a standard I use the engine to slow a lot and traffic around here is minimal. Not like I'm towing with it

Are the BM rotors coated? If I'm spending the money on something nice I'd like them to nut rust on the hats like cheap advance/zone rotors.
BM uses Centric Premium rotors for its kits. They have a pad and rotor kit which is an inexpensive way to get into some much improved braking. You won't find a better braking pad for the Wrangler. Be aware you can't baby the BM pads and expect them to keep their awesome performance. .

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post #7 of 16 Old 05-12-2021, 01:40 PM Thread Starter
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BM uses Centric Premium rotors for its kits. They have a pad and rotor kit which is an inexpensive way to get into some much improved braking. You won't find a better braking pad for the Wrangler. Be aware you can't baby the BM pads and expect them to keep their awesome performance. .
So your saying these wouldn't be good for some one that doesn't drive at 10/10th all the time? I rarely need to panic stop and again, it's a jeep not a sports car.
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post #8 of 16 Old 05-13-2021, 06:22 AM
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So your saying these wouldn't be good for some one that doesn't drive at 10/10th all the time? I rarely need to panic stop and again, it's a jeep not a sports car.
not really a panic stop, but they tend to glaze over for people that drag the brakes for half a block before coming to a stop.
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post #9 of 16 Old 05-15-2021, 04:38 AM
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not really a panic stop, but they tend to glaze over for people that drag the brakes for half a block before coming to a stop.

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
2003' Rubicon/Zone 4.25" combo lift with Rancho RS5000X shocks/ Zone hydro shocks/5.13 gears/35" Mickey Thompson MTZ P3 tires/Black Magic brakes. Jeep #17 & 19.
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post #10 of 16 Old 05-15-2021, 11:34 AM
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So your saying these wouldn't be good for some one that doesn't drive at 10/10th all the time? I rarely need to panic stop and again, it's a jeep not a sports car.
It doesn't matter if we are driving Jeeps or sports cars... when we need to stop fast we need to be able to stop fast. Not to mention it take more braking power to brake our Jeeps than it does a sports car.

And the bigger the tires you run, the better/more powerful the brakes need to be. The bigger the diameter of the tire, the more leverage it has over the brakes. If you don't want the best brakes for your safety, go down to Autozone and get their cheap Duralast brake pads. Don't complain about their crappy braking though.
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post #11 of 16 Old 05-15-2021, 12:30 PM
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Well I didn't Know about BM brakes and they may not be right for me as I live in the mountains with 5-10 % grades
10MPH switch backs, I really don't mud unless its on my road after a rain and most of my 'Wheeling' is ON road but in deep snow... I do frequently drive though a lot of cattle manure though

I went with the Power stop Truck and Tow drilled slotted for the heat on the mountains.

I AM on the road here and yes I am Stuck in about 3 feet of hard pack wind blown powder.:
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post #12 of 16 Old 05-15-2021, 01:46 PM
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I went with the Power stop Truck and Tow drilled slotted for the heat on the mountains.]
The slots and holes are actually to allow the off-gassing from red hot pads to escape which is common during high-speed racing. The off-gassing forms a thin layer of gas between the rotor and pads thich reduces braking effectiveness. It's for that layer of gas that drilling and slotting was developed, as a way for the gas to escape. Those can, however, be counterproductive for non-race application since both reduce the swept surface area of the rotor which is a fancy way of saying there's not as much rotor for the pads to grab.

Notice the Centric Premium rotors used in the Big Brake Kits made by Black Magic Brakes are neither slotted nor drilled.
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post #13 of 16 Old 05-15-2021, 02:21 PM
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Quote:
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The slots and holes are actually to allow the off-gassing from red hot pads to escape which is common during high-speed racing. The off-gassing forms a thin layer of gas between the rotor and pads thich reduces braking effectiveness. It's for that layer of gas that drilling and slotting was developed, as a way for the gas to escape. Those can, however, be counterproductive for non-race application since both reduce the swept surface area of the rotor which is a fancy way of saying there's not as much rotor for the pads to grab.

Notice the Centric Premium rotors used in the Big Brake Kits made by Black Magic Brakes are neither slotted nor drilled.
The Price of ignorance has Always been High. In my case, I seem to pay a lot.........
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post #14 of 16 Old 05-21-2021, 11:59 AM
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I also strongly recommend blackmagic brakes. Great braking effectiveness.

Now: '04 Solar Yellow Rubicon on 33"s & mods.
Previous TJ's: '98 & '00 sports, '04 & ‘05 Rubicons
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post #15 of 16 Old 05-24-2021, 11:32 PM
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When I went to 33's I installed the EBC Yellow stuff pads, noticeable difference over the stock pads, but I now have 35s and Black Magic braking system and it's a BIG difference over those EBC pads. I would highly recommend going with the BM pads, and I speak from experience.

Mark
K6RZY

Joaquin Jeepers
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