Ireding

I have a 2014 JK sport that is equipped with stock 17" Rubicon rims and no wheel spacers. The brakes are getting worn and I have added a fair amount of weight to the vehicle in tires, body armor, winch and other upgrades. I am looking for recommendations to upgrade the brake system to compensate for the added weight without changing rims or adding wheel spacers. Looking for recommendations for pads, rotors, calipers, etc... that will improve my braking performance compared to original OEM parts.Thanks.

nthinuf

What's the budget?

Dynatrac and Teraflex have big rotor kits for all four corners. (bigger rotors / pads / brackets) Teraflex was roughly $350 less than dynatrac when I got mine.

Teraflex and Mopar have front big brake kits. (rotors / pads / brackets / twin piston calipers - brakelines and/or booster/master depending on year/kit)

Then there are several vendors with much more pricey alternatives, if that floats your boat.

Or, some are happy with just getting stock-sized power stop rotors and new pads, or similar.

icrashbikes

I put the Dynatrac kit in mine, front and rear. Stops better on 37s now than it did all stock. I have 17" Level 8 Tracker pros on mine and the clearance is tight, but it works. Dynatrac has templates that you can print out and check inside your wheels.

jadmt

On my 2014 jkur I ran Tera flex's big rotor kit and for the money and ease of installation it was worth every penny. I ran it with stock pads and they did great. I will be adding the same to my new jkur recon.

Dynatrac

Here's a link to our fitment guide, so you can verify if our ProGrip brake upgrade will fit your 17-inch wheels.

https://www.dynatrac.com/downloads/W...structions.pdf

Mark Doiron

I don't want to sound argumentative, but I guess I'll risk that. Please, these are honest thoughts about your statement above because I'm confused. And I've discussed this with my daughter, who happens to be an engineering physicist IRL, a year away from her PhD, and she agrees with me.

The stopping power of an OEM Jeep is the tires on the pavement. You can't stop any faster because the antiskid will kick in. Once the antiskid kicks in, that's it. You're not going to stop any faster. So, unless you've done something to the Jeep that keeps the antiskid from kicking in, you can't stop faster. It has to do with the coefficient of friction between the tire and the surface the tire is on. NOTHING can make you stop any faster once antiskid kicks in.

Now, that isn't saying these big brake kits don't have a place. They certainly do. Smaller brakes overheat more quickly, so brake fade is reduced. And towing trailers and the mass of mods can push the vehicle along, overpowering the antiskid. So, I'm not disagreeing that you've improved your brakes. I'm disagreeing that putting these brakes on an OEM Jeep will make it stop faster. Or, at least the implication I read in your post.

Mr.T

Copied from a previous post, this might be what you're after:

Installed the new Raybestos ceramic-metallic hybrid brake pads (EHT1273H & EHT1274H) about 500 miles ago. The DOT friction code rating is GG for all pads, factory is FF -- A higher coefficient of friction should translate into more braking force for the same pedal effort. The shims on the back of the pads are thin steel bonded to resilient material that's bonded to the back of the pad.

Can't quantitatively say how much better the braking might be, but it feels like an improvement.



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Dynatrac

It's all about leverage. While tire surface area does play a factor, the inertia of the rotating mass plays way more of a part in getting your Jeep slowed down and stopped. Especially when you have a Jeep with larger wheels and tires installed, which are typically heavier than factory units, and that increased weight adds even more inertia to the package that the breaks have to overcome when getting your Jeep stopped. It's a lot like when you're trying to loosen a nut or bolt that's really tight. You go get a longer ratchet, wrench or breaker bar to get it loose. That's leverage, and it's similar to how larger brakes work to increase stopping power and ability.

jedg

Hrm... I don't buy that completely. So, first, the constants. In this case, we will say the same size tires, the same weight for the rig, and the same ABS system, same pavement, and same weather conditions. Same ABS means that the length of time and pressure exerted by the calipers is the same for OEM and Dynatrac. So far, they would produce the same braking performance. What does differ is the distance from the axis where the braking takes place. OEM is closer to the axis. Dynatrac is further. From physics.bu.edu - The size of torque depends on the size of force applied (in this case the caliper so OEM and Dynatrac are equal) and it's perpendicular distance from the axis of rotation. Dynatrac places the caliper further from the axis of rotation so it produces more torque. So even for the very small amount of time the brakes are engaged by the ABS system, the Dynatrac brakes are doing more to stop the vehicle.

SO.. does the Dynatrac system cause a jeep to stop faster than the OEM brakes... hypothetically, yes... in real world tests... well, Dynatrac reports "fully instrumented testing showed lower brake pedal pressure and a reduction of stopping distance of up to 30 percent compared to stock brakes on a Jeep JK outfitted with a 4-inch lift and 37 inch tall tires. Measured G-force during moderate braking (1,000 psi brake fluid pressure) increased from 0.48 Gs with stock brakes to 0.63 Gs with the Dynatrac ProGrip system."... this is from the Dynatrac website, so of course it's in their interest, but I'm sure they can produce the information on testing.

<EDIT> ... you assumed that you've consumed all of the stopping power of the tires (friction between the tires and the pavement)... from above, it would appear that the OEM system does not consume all of the stopping power, which is why the Dynatrac system can produce better numbers with all constant other than the rotors and pads.