TeraFlex Install: JL/JLU - JK/JKU Delta Brake Kit





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Published on Mar 28, 2019

The TeraFlex JL/JLU--JK/JKU: Delta Brake Kit is the ultimate upgrade for JL/JLU and JK/JKU Wrangler models with oversized and heavier wheels/tire combos requiring increased braking performance. A must for 33-42” tires or heavy-laden overland rigs. Includes all the components required to upgrade both front and rear axles.

Modulus measures a material’s resistance to elastic (recoverable) deformation under load. A stiff material has a high modulus, which means it only changes shape slightly under high elastic loads before returning to its normal shape. The Delta Brake Calipers features a high-modulus bridge.


• JL Wrangler (2-door)
• JLU Wrangler Unlimited (4-door)
• JK Wrangler (2-door)
• JKU Wrangler Unlimited (4-door)

• Minimum Wheel Diameter: 17”
• Back Spacing: 4.5” or less
• Bolt Pattern: 5x5”


• High-Modulus Brake Caliper Kit w/ pads- front
• High-Modulus Brake Caliper Kit w/ pads - rear
• 14” x 1.25” vented & slotted rotors w/ 5x5” bolt pattern - front (# 4403455)
• 14” x 1.25” vented & slotted rotors w/ 5x5” bolt pattern - rear (# 4403456)
• All necessary hardware

Features & Benefits:

• Significantly improved braking performance over factory brake system
• Balanced front to rear brakes tuned specifically for lifted vehicles
• Brake bias & piston sizes optimized for Wrangler
• Designed to work w/ stock proportioning valve & ABS
• 100% bolt-on upgrade for easy installation
• 3-year warranty

Front & Rear Calipers:

• Opposed 4-piston caliper design w/ 2” pistons
• Same flow rate as factory 2-piston calipers – 4 pistons move each side half the distance instead of 2 pistons only moving one side the full distance
• EPDM synthetic boot material keeps water & other contaminants away from piston
• Hard-chrome coating on piston reduces friction to improve performance
• 4-piece High-Modulus bridge caliper design combines heat-treated 4140 cast steel bridge w/ T6 6061 forged aluminum piston housings
• Steel bridges resist bending/flex better than standard aluminum or cast iron
• Improved stiffness = consistent brake feel/modulation during brake application & release
• Low-profile bridge accepts 14” diameter rotors behind 17” wheels
• 1,000-hour salt spray tested zinc-& E-dipped coating on bridges & mounts
• 300,000 psi steel formed hardware
• Calipers feature built-in auto bleeding check ball, valve, & spring for easy bleeding
• Hard-coat anodized, scratch-resistant piston bores

Front & Rear Brake Rotors:

• Massive 14” x 1.25” vented rotors for superior stopping performance
• Larger diameter rotors offer more mechanical advantage for more stopping power
• Heat-treated, heavy cast-iron rotors offer better heat absorption
• Mill-balanced, vented rotors for maximum heat dissipation
• Included slotted rotors offer better gas dissipation than smooth rotors
• GEOMET coating on non-friction surfaces resists corrosion
• Rotors feature 5x5” bolt pattern

Front & Rear Brake Pads:

• Proprietary composite-resin, semi-metallic pads provide excellent full temperature stopping power for maximum initial speed scrub w/ increased pad life & reduce noise & dust
• Drop-in pad design – no need to disassemble calipers to replace pads

Stock Brake Rotor Reference:

JL/JLU Sport front: 12.9” x 0.94” (330mm x 24mm) vented rotors
JL/JLU Sport rear: 12.9” x 0.47” (328mm x 12mm) solid rotors
JL/JLU Sahara/Rubicon front: 12.9” x 1.1” (330mm x 28mm) vented rotors
JL/JLU Sahara/Rubicon rear: 13.4” x 0.55” (342mm x 14mm) solid rotors
JK/JKU front: 11.9” x 1.1” (302mm x 28mm) vented rotors (U.S.-spec)
JK/JKU rear: 11.9” x 1.1” (302mm x 28mm) vented rotors (U.S.-spec)


• Requires a minimum wheel diameter of 17”.
• On JK/JKU models, we recommend upgrading the stock master cylinder and brake booster to the Mopar Master Cylinder & Brake Booster Kit (# P5160050). Contact your Mopar dealer for availability.
• JL/JLU_JK/JKU: Delta Brake Kit - Front & Rear - 8x6.5” Bolt Pattern (# 4403480) also available.

Install Time: 4 Hours


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