Racing Brake is in the game.

The SRT8 WK2 caliper kit (w/380mm rotor) was up on the test bench and everything fit as expected. (Note this hat was used for simulated test only)



Please click the item line for more information.






Weight comparison (between ST sports brake and WK2 retrofit kit)

Thank you.

For the rear BBK, in order to retain the e-parking brake, the BBK requires a longer bracket with an estimated rotor size of 390mm. This would be the same rear BBK we offer for Tesla M3 rear BBK (390x28).

Please take a look at this kit and let us know if this is something you and other Explorer owners are interested.

To match the rear BBK with 390mm, we propose to increase the front brake kit rotor size to 400x34mm (=Trackhawk) - If this bundle kit is what other Explorers' owners are interested we can make the kit avaialable

This 400/390 rotor set up can provide you not only the braking power you need in any driving condition; but also provides you a muscular look inside OE's big wheels - In fact it would be better (more balanced) than Trackhawk's 400/350 OE set up.



Note: Trackhawk has a rear drum brake so the proposed kit is a complete 4-pot caliper kit while Explorer's rear rotor has no drum brake but the caliper (retained) also function as parking brake.

Car mfgrs and Brembo collaborate and play tricks so to avoid easy swap between makes and models. However we have a large database and the physical collection on OE calipers (some 220) and spindles (some 240) with dimension & feature measured and digitized which allowed us to scan through our database and spot any possible retrofit with least or no modification.

RB brake kits are designed with confidence (no try and error) from the resource and knowledge accumulated over the decades, so our turn around is quick.

OE Spindles:


OE Calipers


Test Bench: (Shown is Explorer Sport front)


Have I answered to your question?

Warren, you are a sight for sore eyes. Sorry in advance if I misunderstood what you’ve already mentioned, but can you clarify the rear setup that would retain the EPB functionality? Are you suggesting to keep the existing OEM caliper or replacing it with another caliper setup that has an integrated EPB? Or, perhaps, a rear caliper setup that has a separate EPB caliper mounted separately?

I for one am very very interested in a larger setup with more pistons from RB. Thanks in advance.

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We will be making a longer bracket for accommodating a larger rotor while OE caliper w/EPB* and brake pads are retained.

This is the most cost effective rear BBK upgrade, retaining OE integrity with easy installation - 100% bolt-on and no need to bleed the system.

*In order to retain OE ePB functionality we are not able to offer a fixed-piston caliper kit.

*In order to retain OE ePB functionality we are not able to offer a fixed-piston caliper kit.

Sorry for being thick... does this mean the same thing as "fixed caliper", i.e., there is no way to run a 4-piston monoblock caliper on the rear? So we are stuck with our O.E. "floating piston" style rear calipers? I'm not sure I've ever hear the term fixed-piston but I'm also nowhere near an expert on this. The Trackhawk uses an ePB... did I miss where and how a conversion for those calipers wasn't possible?

Sorry for being thick... does this mean the same thing as "fixed caliper", i.e., there is no way to run a 4-piston monoblock caliper on the rear? So we are stuck with our O.E. "floating piston" style rear calipers? I'm not sure I've ever hear the term fixed-piston but I'm also nowhere near an expert on this. The Trackhawk uses an ePB... did I miss where and how a conversion for those calipers wasn't possible?

I am no expert either but I think I can help explain and share what I’ve learned so far from my other conversations. Someone correct me if I’m wrong please.

Current ePB is integrated into the OEM caliper. To upgrade the caliper to aftermarket 4pot and keep ePB capabilities, a company would need to create a compatible 4pot caliper with an integrated ePB that mounts using the same mounting points or uses a bracket - and uses a compatible electronic interface (I’m not sure if they’re standardized). The only one I’ve seen to date is Rotora. That’s why [mention]Warren-RB [/mention] is saying the most cost effective way is to stay with existing caliper and just upgrade the rotor. And he’s right.

Alternatively, with the right cash, risk and patience, one could mount a 4pot caliper (w/o ePB) AND a separate ePB specific caliper in tandem - like below.



However.....This requires an electronic interface for the ePB caliper to talk to the oem computer. One such thing does exist over at Wilwood. I’ve spoken to them and a custom shop they’ve referred me to. This Wilwood rear kit (I’ve been told) will fit the Explorer rear with an appropriately created bracket and MIGHT be able to interface with the OEM ePB controller. The only way to know compatibility for certain would be to spend a lot of cash to be a guinea pig. Plus the guy I was talking with wanted me to buy front and rear spindles for the effort. I would but I’m not currently built like that. That’s why when [mention]Warren-RB [/mention]said that he had spindles and all that I was all ears.

I am very interested in the RB setup here but for the sake of sharing knowledge, here’s the Wilwood Aero4 links that I mentioned above.

For the front: https://www.wilwood.com/BrakeKits/BrakeKitsProdFront?itemno=140-13887-R

For the rear. https://www.wilwood.com/BrakeKits/BrakeKitListRear?mincatdesc=AERO4 Big Brake Rear Electronic Parking Brake Kit


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Sorry for being thick... does this mean the same thing as "fixed caliper", i.e., there is no way to run a 4-piston monoblock caliper on the rear? So we are stuck with our O.E. "floating piston" style rear calipers? I'm not sure I've ever hear the term fixed-piston but I'm also nowhere near an expert on this. The Trackhawk uses an ePB... did I miss where and how a conversion for those calipers wasn't possible?

I’m guessing they sent you to Little Shop? They’ve done this on late model F150’s using the same 16” front rotor and 6 piston caliper for the front of those trucks plus the extra epb. Luckily mine had a normal parking brake so I just had their normal kits on my 16 F150.

I am no expert either but I think I can help explain and share what I’ve learned so far from my other conversations. Someone correct me if I’m wrong please.

Current ePB is integrated into the OEM caliper. To upgrade the caliper to aftermarket 4pot and keep ePB capabilities, a company would need to create a compatible 4pot caliper with an integrated ePB that mounts using the same mounting points or uses a bracket - and uses a compatible electronic interface (I’m not sure if they’re standardized). The only one I’ve seen to date is Rotora. That’s why [mention]Warren-RB [/mention] is saying the most cost effective way is to stay with existing caliper and just upgrade the rotor. And he’s right.

Alternatively, with the right cash, risk and patience, one could mount a 4pot caliper (w/o ePB) AND a separate ePB specific caliper in tandem - like below.



However.....This requires an electronic interface for the ePB caliper to talk to the oem computer. One such thing does exist over at Wilwood. I’ve spoken to them and a custom shop they’ve referred me to. This Wilwood rear kit (I’ve been told) will fit the Explorer rear with an appropriately created bracket and MIGHT be able to interface with the OEM ePB controller. The only way to know compatibility for certain would be to spend a lot of cash to be a guinea pig. Plus the guy I was talking with wanted me to buy front and rear spindles for the effort. I would but I’m not currently built like that. That’s why when [mention]Warren-RB [/mention]said that he had spindles and all that I was all ears.

I am very interested in the RB setup here but for the sake of sharing knowledge, here’s the Wilwood Aero4 links that I mentioned above.

For the front: https://www.wilwood.com/BrakeKits/BrakeKitsProdFront?itemno=140-13887-R

For the rear. https://www.wilwood.com/BrakeKits/BrakeKitListRear?mincatdesc=AERO4 Big Brake Rear Electronic Parking Brake Kit


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The rear BBK is designed as 380mm so it can well match to the front kit w/380mm rotors:

1. RB 6 Pot caliper kit: https://racingbrake.com/2667-k
2. Jeep SRT8 (WK2) caliper kit: https://racingbrake.com/2666

This rear BBK is also an excellent upgrade for those ST owners with non-sports models and did'nt what how to deal with "Dealers" in upgrading their brakes to "Sports", all you have to do is to acquire the rear "Red" calipers per our description or contact us for assistance, we can include the calipers in the kit but they would have to be new while you can save some money in buying used calipers from eBay.

Are you also available to help source WK2 calipers as well? Does that usually end up being the more "affordable" route or is your in-house caliper a better deal? I know that its a weird question, asking that--but what would be the pros/cons of a WK2 front kit vs your RB front kit?