Need Help (1st Post) - DBA / RDA / EBC vs Stock Rotors/Disc Brakes - Jeep Garage - Jeep Forum

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Old 08-22-2016, 01:39 AM
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Need Help (1st Post) - DBA / RDA / EBC vs Stock Rotors/Disc Brakes

Hi.

Apologies in advance if this is a duplicate post. I can't seem to find any related post. Also this is my first ever post in the forum.

I need help to decide on the following for my Jeep GC WK2 Limited V6 3.6L Petrol with 20" Wheels:

My WK2 is coming to it's 3rd year of service. Have a disc bend. I've read somewhere this is becoming very common with this car and specially with the stock Rotors/Discs.

I would like to know from all of you out there, specially in Australia, which of these would you recommend? EBC/RDA or DBA or Back with Stock one Mopar?

Do you recommend any specific model?

On this note, I know the front is 328mm can you install a 330mm?

For Brake Pads, any recommendation? Should I just stick to Factory ones?

Thank you very much in advance for your assistance and recommendations.

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Old 08-22-2016, 06:59 AM
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Re: Need Help (1st Post) - DBA / RDA / EBC vs Stock Rotors/Disc Brakes

Hey Mate,

I am not sure where you got the 328mm reference but here in the States, Grand Cherokee brakes come in 3 flavors:

Front 330 mm vented; Rear 330 mm solid - Gasoline V6 Pentastar
Front 350 mm vented; Rear 330 mm vented - Hemi V8; Diesel V6
Brembo SRT brakes - SRT

You can absolutely run larger disc brakes on the front with minimal cost - but you have to buy from the dealership the bracket for those 350 mm factory brakes that would essentially mount the caliper closer to the edge of the disc. Improvements in braking come from the fact that you now have a longer fulcrum arm, for the same clamping force generated by the caliper and larger surface area to dissipate heat.

For the rears, at least here in US, one would have to buy new calipers that can accommodate the wider vented rear brake discs. I have done both mods and I am pleased.

As for pads, I wanted to run a popular pad here with Subaru drivers: Hawk HPS but the distributor messed up the inventory control and sent the wrong pad. In a pinch, the old pads went back for longer duty (pads are the same between the V6, the V8 Hemi and the Diesel). I would put DBA rotors based on my Subaru experience but they are very expensive here. Make sure whatever you put, that they are treated against corrosion.
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Old 08-22-2016, 09:42 PM
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Re: Need Help (1st Post) - DBA / RDA / EBC vs Stock Rotors/Disc Brakes

Hi f1anatic.

Thanks for your tip. I got the measurements of the discs/rotors from the dealer here in Australia.

They gave me those measurements and also it's showing on their brochures.

I was told they were happy to install the rotors/discs but suggested to get the original pads so that if there's squeaking or issues they can cover it.

About modifying it, I don't want to do a major mod as I still have 3 years more warranty to go.

Any other suggestion? What rotors?

Thanks.
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Old 08-23-2016, 06:26 AM
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Re: Need Help (1st Post) - DBA / RDA / EBC vs Stock Rotors/Disc Brakes

As I mentioned earlier, I would choose DBA rotors. Pads - I would try Hawk LTS.
Regarding the bigger front brakes, you must have the 18inch (or larger) wheels. The larger rotors plus the related hardware will not fit inside the 17 inch wheel package.

Last word on brakes: if you go ahead and replace the rear calipers you will need to bleed the brakes. Make sure you have a good brake fluid replacement: ATE Super Blue DOT 4 fluid (now sold as TYP 200 amber in United States) or Motul. I always use ATE in all my cars. You will need at least 2 rounds of manual pumping/bleeding.

Also, having bled the brakes, and having seen how little pedal travel is on the rear brakes, I believe that the actual clamping force is very small. For safety reasons and for maximum braking efficiency cars have a brake bias for the front. Could be as much as 70% F 30%R. I always felt more comfortable with a more grippy rear brakes - and on the Subaru I've been running softer rear pads for 8-9 years now (i.e. Hawk HPS front and Hawk HP+ rear). I am tempted to run softer pads on the rear of the Jeep when I end up changing them, to alter the brake bias ever so slightly.
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Old 08-23-2016, 08:56 AM
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Re: Need Help (1st Post) - DBA / RDA / EBC vs Stock Rotors/Disc Brakes

Let me weigh in here

OEM mopar brake fluid is DOT 3 ( I read a long winded article about brake fluids and there compounds and designations and using a DOT 3 or DOT 4 was no clear advantage one over the other)

I would say to you that doing a brake fluid flush overall would do you a world of good since it helps eliminate the corrosion that is building up in the system. You ever wonder why you put in clear brake fluid and it comes out brownish over time. That is the corrosion (rust forming) from the water absorption.

The price of DBA rotors are crazy expensive.

Initially I instally the Larger 350 mm front rotors and converted the rears to the vented rotors.

I used the OEM replacement disc and I used OEM pads and I had a satisfactory braking perfomance.


I later added stainless steel brake lines and I am satisfied with the performance.


I later upgraded the pad to Raybestos EHT E3 pads and they work great just like stock with no squealing whatsoever.

Your initial move should be gettin the larger front rotor and caliper bracket since you get a mechanical increase in brake force.

Next I would say would be doing the stainless brake lines as this will keep the pedal pressure constant over the life of the vehicle instead of having the rubber hose flex. The addition of the stainless lines improves the clamping force on the rear calipers and gives you a better balanced braking system like the engineers designed it.

Sometimes I feel like the stainless line are not much of an improvement then I drive our other WK2 and I can tell the difference in brake feel.
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