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JK: Front Big Brake Kit w/ Slotted Rotors – 5x5” & 5x5.5”

SKU 4303420
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This item ships for free! (Continental U.S. only)

The TeraFlex JK: Front Big Brake Kit is vital for JK Wrangler/Unlimited models with oversized and heavier wheel/tire combos requiring increased braking performance. A must for 33-35” tires.

This simple bolt-on upgrade doesn’t require cutting, welding, or adapters.


• JK Wrangler (2-door)

• JK Wrangler Unlimited (4-door)


• Front Big Brake Calipers – pair

• Front Big Brake Pads (# 4303430) – all 4

• Front Slotted Brake Rotor – Left – 5x5” & 5x5.5” (# 4303412)

• Front Slotted Brake Rotor – Right – 5x5” & 5x5.5” (# 4303411)

• All necessary hardware

Features & Benefits:

• Min. Wheel Diameter: 17”

• Rotors feature dual bolt patterns: 5x5” and 5x5.5”

• Improved braking performance over factory brake system

• 100% bolt-on upgrade w/ basic hand tools

• Oversized 56mm (2.2”) dual-piston calipers for increased clamping force and surface area

• Larger 13.3” rotors for superior stopping performance (vs. 11.9” stock rotors)

• Slotted rotors offer better gas dissipation than smooth rotors

• Mill-balanced vented rotors for maximum heat dissipation

• Composite-resin, semi-metallic pads have excellent full temperature stopping power for maximum initial speed scrub w/ increased pad life and reduce noise and dust


• Requires a minimum wheel diameter of 17”.

• On 2007-2011 JK Wrangler/Unlimited models, we recommend upgrading the stock master cylinder to our Brake Master Cylinder Kit w/ Oversized Bore (# 4303450).

Install Time: 3 Hours


Front Big Brake Kits:

• w/ Slotted Rotors (# 4303420)

• w/ Vented Rotors (# 4303400)

Performance Big Rotor Kits:

• Front Kit w/ Slotted Rotors (# 4303490)

• Front Kit w/ Vented Rotors (# 4303480)

• Rear Kit w/ Slotted Rotors (# 4304460)

• Rear Kit w/ Solid Rotors (# 4304450)

Replacement Parts:

• Front Big Brake Kit Pads – All 4 (# 4303430)

• Slotted Rotor – Front Left (# 4303412)

• Slotted Rotor – Front Right (# 4303411)

• Vented Rotor – Front - Each (# 4303410)

• Slotted Rotor – Rear Left (# 4304412)

• Slotted Rotor – Rear Right (# 4304411)

• Solid Rotor – Rear – Each (# 4304410)

Weight:  94.0 lbs

Vehicle Type:
JK Wrangler
JKU Wrangler Unlimited

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January 14th 2015
I put this big brake kit on my JKU and it stops my 40" Kevlar MTR's on a dime!!!
November 3rd 2016
Bobby Wade
Install is a breeze and materials are rock solid and built to last. My Jeep stops like a sports car now running on 35's.
February 28th 2017
Install was like any other brake job. They are a huge improvement over stock. Beware, they say minimum of 17" wheel. That leaves barely any clearance between the wheel and caliper for wheel weights. I had my newly balanced wheels have their weights ripped off after install. I recommend these brakes with at least 18" wheels.
December 1st 2018
Kent Foster
Found this kit after unending frustration with long stopping distances on my 2010 Jeep JK with 37 inch tires. While I did not do the install personally, my friends Darren and Travis said it was a smooth install. I would also recommend the big bore master cylinder for this year. Also replaced rear rotors with the big (non-slotted) rotors and used the factory brakes. The difference is well worth every penny and I can drive with confidence Very positive stopping power!