2005-2006 Jeep Wrangler Brake Caliper Problems and Replacement

By Core Brake Parts Tech Team — Circleville, OH warehouse

On a 2005-2006 Jeep Wrangler TJ, caliper trouble almost always shows up as one of three things: the Jeep pulls to one side under braking, one front wheel runs noticeably hotter and smells of hot pad material after a drive, or brake fluid weeps from the caliper and the pedal goes soft. The cause is usually corrosion on the piston or slide pins from water, mud and road salt - the exact environment a Wrangler lives in. The fix is a replacement caliper on that axle, fresh pads, a close look at the rotor and the rubber hose, and a proper bleed.

How the Brakes Are Laid Out on a 2005-2006 Wrangler

Every 2005 and 2006 TJ, including the Unlimited, has disc brakes with a caliper at each front wheel. What happens at the back depends on the trim and axle, and it matters before you order anything:

The rear disc setup was offered from 2003 through 2006, so a 2005-2006 Rubicon uses different rear pads, rotors and brake lines than a drum-brake Sport. Some TJs were also built with ABS and some without, and brake line and hose parts are listed separately for each. The quickest way to confirm what you have is to look through the rear wheel: a round drum with no caliper means rear drums; a rotor with a caliper clamped to it means rear discs.

Symptoms of a Failing Caliper on a TJ

• Pulling to one side when you brake. A seized piston or slide pin means one side clamps harder or releases slower than the other, so the Jeep steers toward the stronger side. On a short-wheelbase TJ with big tires this is easy to feel.
• Brake drag and a hot wheel. After a normal drive, one wheel and rotor is much hotter than its partner, you may smell burning pad material, and fuel economy drops. The Jeep may also feel like it is fighting you when coasting.
• Uneven pad wear. The inner pad is worn far thinner than the outer (or the reverse), or one side of the axle is worn much more than the other. That pattern points at a caliper that is not sliding freely, not just at worn pads.
• Grinding, squealing or clunking. A pad that stays pressed against the rotor wears to the backing plate quickly and starts to grind.
• Fluid at the wheel or a soft pedal. Wetness on the inside of the tire or caliper body, a dropping fluid level in the reservoir, or a pedal that sinks further than it used to means a seal has let go. Fresh brake fluid is light yellow and darkens as it ages.
• Vibration under braking. Uneven clamping overheats the rotor and can produce a pulsation in the pedal or steering wheel.

Why Wrangler Calipers Stick and Leak

Wagner, which makes calipers and pads, lists three main ways calipers fail, and a Wrangler that sees trail use or winter roads meets all three:

• Corrosion. Moisture, road salt and dirt corrode the metal parts of the caliper until the piston or the caliper body seizes. Water crossings and mud packed around the knuckle speed this up.
• Heat-damaged seals. High temperatures wear the piston seal and dust boot. Once the boot tears, water and grit get behind it and score the piston.
• Debris in the slides. Dirt lodged in the caliper and bracket stops the pads and caliper from sliding, which gives the uneven wear described above.

Wagner puts typical caliper life at 75,000 to 100,000 miles. A 2005-2006 TJ is now old enough that most original calipers have passed that point, so a sticking or leaking caliper on one of these Jeeps is age and exposure, not bad luck.

Before you blame the caliper, check the flexible rubber hose that feeds it. An old hose can collapse internally and hold pressure in the caliper after you release the pedal, which feels exactly like a seized piston. If the wheel frees up when you crack the bleeder open, the hose is a prime suspect.

Recalls and the Master Cylinder Connection

NHTSA shows no factory brake recall for the 2005 or 2006 Wrangler; the vehicle recalls for these years cover the automatic transmission park mechanism and clutch parts. There is one brake-related equipment recall that appears under the 2005 Wrangler, campaign 06E022000: certain aftermarket replacement master cylinders built between July 27, 2005 and January 17, 2006 could leak fluid in very cold temperatures. If a previous owner replaced the master cylinder around that time and you are chasing a soft pedal along with caliper work, run your VIN on nhtsa.gov and inspect the master cylinder too. Replacement units are in our brake master cylinders collection.

The Fix: Replacing a Caliper on a 2005-2006 Wrangler

Caliper replacement is a manageable driveway job with basic hand tools, a line wrench and a way to bleed the brakes. The general sequence on the front:

1. Loosen the lug nuts, lift and support the Jeep on stands, and remove the wheel.
2. Clamp or cap the brake hose to limit fluid loss, then remove the hose banjo bolt or fitting from the caliper.
3. Remove the caliper mounting bolts and lift the caliper off. Pull the pads and inspect the rotor for scoring, heat spots and thickness against the minimum stamped on it.
4. Clean the mounting surfaces, fit new pads and hardware, and install the replacement caliper. Use new copper sealing washers on a banjo fitting.
5. Torque the caliper bolts and brake fittings to the values in the factory service manual - do not guess on brake fasteners.
6. Bleed the brakes, starting at the corner farthest from the master cylinder, until the fluid runs clear and bubble-free. Top up with the fluid type printed on the reservoir cap.
7. Pump the pedal before moving the Jeep, then bed in the new pads with a series of moderate stops.

On a Rubicon, the rear calipers are handled the same way, but check how the parking brake is set up on your axle before you start so you reassemble it correctly. Rear disc parts are specific to the 2003-2006 disc-equipped axles and will not fit a drum-brake TJ.

Replace calipers in pairs across an axle. A fresh caliper on one side and a worn original on the other will not clamp evenly, and you will be back to a pull. You can browse replacement units in our brake calipers collection, and remanufactured options from Cardone and performance calipers from Power Stop are also available.

What to Replace at the Same Time

• Pads. Pads that have been dragged by a stuck caliper are usually glazed or tapered. Fit a new set across the axle from our brake pads range.
• Rotors. A dragging caliper overheats the rotor. If it is scored, blued or below minimum thickness, replace both rotors on the axle with matching brake rotors.
• Rubber brake hoses. On an older Wrangler that has seen mud and articulation, the front hoses are cheap insurance and rule out the internal-collapse problem. See brake hoses.
• Hardware. New clips, pins and boots help the new caliper slide freely. A brake hardware kit covers them.
• Brake fluid. Fluid absorbs moisture over time, and that moisture is part of what corrodes caliper pistons from the inside. A full flush while the system is open is worth doing.

Frequently Asked Questions

Does my 2005 or 2006 Wrangler have rear calipers?

Only if it has rear disc brakes. Rubicon models with the Dana 44 rear axle have them, as do other 2003-2006 TJs built with the rear disc option. Most other TJs use rear drum brakes with no rear calipers at all.

Can I replace just one front caliper?

You can, but it is better to replace both on the axle. Mismatched calipers clamp unevenly and can leave you with the same pull you were trying to fix.

Why does my Jeep pull to the right only when braking?

A braking-only pull usually means one front caliper is working harder than the other. The left caliper may be seized and not clamping, or the right may be sticking on. Hose collapse and contaminated pads can do the same, so check the whole corner.

Is a sticking caliper safe to drive on?

Not for long. A dragging caliper overheats the pads, rotor and fluid, which can fade the brakes. Get it fixed before a long drive or any towing.

Do rear disc brakes from a Rubicon fit a drum-brake Wrangler?

Not as a simple swap. The Rubicon rear discs are tied to its Dana 44 axle, backing plates and brake lines. Converting a drum-brake TJ takes a dedicated conversion kit, not replacement calipers.

Sources

1. NHTSA recalls, 2005 Jeep Wrangler - equipment recall 06E022000 on aftermarket master cylinders built July 27, 2005 to January 17, 2006; no factory brake recall
2. NHTSA recalls, 2006 Jeep Wrangler - recalls cover clutch and transmission parts, none for the brakes
3. Wagner Brake - What are brake calipers - caliper failure causes (corrosion, seals, debris), symptoms, typical 75,000-100,000 mile life
4. AAA Club Alliance - 4 signs your brakes need service - pulling, fluid leaks and fluid color
5. TJ Wrangler brake parts fitment listings - 9 x 2.5 in rear drums on 2000-2006 TJ, rear disc pads for 2003-2006 TJ and Unlimited, ABS and non-ABS variants
6. 2003-2006 Wrangler Rubicon brake line kit fitment - Rubicon rear disc brakes with Dana 44 axle