By Core Brake Parts Tech Team — Circleville, OH warehouse
Short answer: The 2007-2018 Jeep Wrangler JK runs 4-wheel discs: 11.89 in (302 mm) front and 12.44 in (316 mm) rear rotors. Any lift over about 4 inches needs extended stainless brake lines (roughly 24 in front, 23 in rear) so the hoses don't pull taut at full droop. This guide walks through the exact diagnostic steps, replacement thresholds, product comparisons, and cost breakdown so you can decide with confidence whether to DIY or take it to a shop.
Direct experience note: we ship these parts daily from our Circleville, OH warehouse to customers across the country. The picks in this guide reflect what fits, what lasts, and what our repeat-buyer mechanics come back for.
The parts that fix this — verified to fit your Jeep Wrangler JK
- 2018-2024 Wrangler JL Front and Rear Truck and Tow Complete Brake Kit - Power Stop Z36 — $762.99
- 2018-2023 Jeep Wrangler JL Front & Rear Brake Kit - Detroit Axle — $292.99
- 2007-2018 Jeep Wrangler Front & Rear Brake Kit - Detroit Axle — $279.99
Ships from our Circleville, OH warehouse. Free shipping over $75.
What to Know About Jeep Wrangler Jk Brakes
Understanding Jeep Wrangler JK brakes matters because it directly affects stopping distance, brake pedal feel, and how often you replace consumables. Getting it right the first time saves both money and follow-up shop visits.
- The JK uses 4-wheel disc brakes across all trims: 11.89 in (302 mm) front and 12.44 in (316 mm) rear rotors.
- Some export and HD-brake JKs used a larger front rotor near 13.09 in, so measure your rotor before ordering pads or rotors.
- Front rotor discard (minimum) thickness is 26.4 mm (1.05 in); rear minimum is 10.4 mm (0.41 in).
- Factory fill is Mopar DOT 3 (dry boiling point about 401 F); DOT 4 (about 446 F) is a smart upgrade for towing or heavy trail use.
- Stock rubber lines are sized for roughly 2.5-3 in of lift; 4-6 in lifts need extended lines about 24 in front and 23 in rear.
- Braided stainless lines resist expansion under pressure for a firmer pedal and shrug off rock, mud, and trail abrasion.
Spec Chart by Vehicle Class
| Vehicle class | Pad thickness | Rotor thickness |
|---|---|---|
| Front rotor diameter | 11.89 in (302 mm) | Standard; some HD/export JKs run ~13.09 in |
| Rear rotor diameter | 12.44 in (316 mm) | Disc all around on every JK trim |
| Front rotor min thickness | 26.4 mm (1.05 in) | Replace or resurface limit; rear min 10.4 mm |
| Caliper bracket bolt torque | 100-120 ft-lbs front | Year-dependent; rear bracket ~77 ft-lbs |
| Lug nut torque | 95 ft-lbs | Star pattern; re-torque after ~500 miles |
How to Diagnose or Replace
- Loosen the lug nuts, lift the Jeep, support it on jack stands, and pull the wheels, working one corner at a time.
- Remove the two caliper guide-pin bolts (about 26 ft-lbs on reassembly), slide the caliper off, and hang it with wire so the hose is never stressed.
- Unbolt the caliper bracket (front about 100-120 ft-lbs, rear about 77 ft-lbs) and pull the old rotor; thread bolts into the puller holes if it is seized.
- Mount the new rotor, torque the bracket, fit the new pads, compress the piston, and reinstall the caliper with fresh guide-pin bolts.
- For a 4-6 in lift, unclip the old hose at the frame bracket and hard-line fitting, catch the fluid, and install the extended stainless line (front ~24 in, rear ~23 in).
- Refill with Mopar DOT 3 (or DOT 4) and bleed each corner farthest-to-nearest until fluid runs clear and the pedal is firm.
- Torque lug nuts to 95 ft-lbs in a star pattern, pump the pedal before moving, and re-torque the wheels after about 500 miles.
- Bed the new pads: 6-10 moderate stops from ~40 mph, then a few from ~60 mph, without coming to a complete stop.
Once diagnosis is complete, order the exact replacement parts for your vehicle - fitment matters. Related Jeep Wrangler JK brakes products are listed in the next section.
Recommended Parts and Where to Buy
Every product below is in stock at our Circleville, OH warehouse and ships same-day when ordered before 2 PM Eastern. Free shipping on orders over $75.
If your exact vehicle is not listed, use the site search or filter the full brake parts collection by year and make.
Cost Breakdown - DIY vs Shop
| Job | DIY parts only | Shop parts and labor |
|---|---|---|
| Front + rear pad sets | $40-$120 | Ceramic or semi-metallic, per axle |
| Rotors, pair | $60-$180 | Front or rear pair; blank or slotted |
| Extended stainless lines, F+R (4-6 in lift) | $70-$160 | Required over about 4 in of lift |
| DOT 3/4 fluid flush | $10-$30 | One quart covers a full bleed |
DIY savings scale with vehicle size and job complexity. A full-size truck brake job saves $450-700 in labor. For most passenger cars, plan on 90-120 minutes per axle for pads only, 2-3 hours for pads plus rotors.
Install Tips - Where Most DIYers Go Wrong
- Route the extended lines to clear the tire at full lock and full droop; cycle the steering and let the axle hang before final tightening.
- Never let a caliper dangle by its hose; the internal liner can crack even when the outer braid or rubber looks fine.
- Flush the old fluid completely when adding lines; DOT 3 absorbs water and 2-plus-year-old fluid can boil early on long downhill grades.
Key Takeaways
- The 2007-2018 Jeep Wrangler JK runs 4-wheel discs: 11.89 in (302 mm) front and 12.44 in (316 mm) rear rotors. Any lift over about 4 inches needs extended stainless brake lines (roughly 24 in front, 23 in rear) so the hoses don't pull taut at full droop.
- Measure friction material and rotor thickness at every tire rotation - catches wear before it becomes damage.
- Replace pads at 3 mm; below 2 mm is unsafe.
- Loaded calipers (with brackets, pads, and hoses) save 1-1.5 hours of labor per side over bare calipers.
- Bed new pads properly with 8-10 medium stops from 40 to 10 mph.
- Free shipping on orders over $75; same-day shipping on in-stock orders before 2 PM Eastern.
0 comments