2015 Dodge Challenger Brake Caliper Problems and Replacement

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most brake caliper trouble on a 2015 Dodge Challenger comes down to one of two things: a caliper that will not release (sticking slide pins on the sliding-caliper cars, or a sticky piston on any of them) or a caliper that is leaking fluid past a worn piston seal. The fix is usually a replacement caliper plus fresh pads, a check of the rotor, and a full brake bleed. Which caliper you need depends heavily on the trim, because the 2015 Challenger lineup ran several very different brake packages.

Which Brakes Does Your 2015 Challenger Have?

Before you order anything, identify the brake package on your car. Dodge built the 2015 Challenger with a wide spread of brake hardware, from sliding calipers on the everyday trims up to Brembo multi-piston fixed calipers on the performance models. According to Dodge's 2015 launch material, the R/T Scat Pack and 392 HEMI Scat Pack Shaker got Brembo four-piston front calipers, rated by Dodge for a 60-0 mph stop in 117 feet. The optional Super Track Pak, offered on every 2015 Challenger including the V-6, added what Dodge called high-performance brakes along with Bilstein shocks and retuned suspension. The Challenger SRT models went further still, with 390-mm (15.4-inch) Brembo two-piece front rotors and six-piston calipers, which Dodge described as the largest front brake package ever fitted to an SRT vehicle.

The quickest way to tell is to look through the wheel. A Brembo caliper has the Brembo name on it and is one solid body that straddles the rotor. A sliding caliper is a smaller body on a separate bracket, held on by two guide bolts. Your build sheet will confirm the package if the car has been modified.

Symptoms of a Bad Caliper

A failing caliper rarely fails all at once. Watch for these signs:

• Pulling to one side under braking. One caliper is gripping harder than the other, or one is not applying fully.
• Pulling or drag while cruising. A caliper that will not release keeps the pads on the rotor, so the car drifts toward that side and coasts poorly.
• One wheel much hotter or dirtier than the others. After a drive, a dragging caliper leaves that wheel noticeably hotter, sometimes with a hot-brake smell and heavy dust.
• Uneven pad wear. An inner pad worn far thinner than the outer pad, or pads worn into a taper, point to a caliper that is not moving or retracting properly.
• Fluid on the inside of the wheel or a dropping reservoir level. A leaking piston seal will eventually soften the pedal and is a stop-driving problem.
• Vibration and a pulsing pedal. A dragging caliper overheats the rotor, and that heat is behind a lot of warped-rotor complaints.

What Causes Caliper Problems on the Challenger

Seized slide pins (sliding-caliper cars)

On a floating caliper the body has to slide on its guide pins so the outer pad is pulled against the rotor. When a pin boot tears, water and grit get in, the grease washes out, and the pin corrodes in its bore. ASE study material on this failure explains that when the pins seize, the outboard pad no longer slides fully into contact with the rotor, so the inner pad does most of the work and wears out early. If only one pin sticks, the inner pad wears at an angle. The result is pull, drag, overheated rotors and short pad life.

Sticking or corroded pistons (all calipers)

Every caliper, sliding or fixed, relies on its piston seal to pull the piston back slightly after each stop. Once the seal hardens, or corrosion builds up behind a torn dust boot, the piston drags. The same ASE reference notes that a bad caliper piston seal can create enough drag to wear the inside pad by itself. On a Brembo four- or six-piston caliper, one sticky piston gives you a pad that wears unevenly across its face.

Old, wet brake fluid

Brake fluid absorbs moisture over time, and that moisture is what corrodes pistons and bores from the inside. A Challenger driven hard, especially a Scat Pack or SRT, cooks its fluid faster. Use the fluid type printed on the master cylinder reservoir cap and in the owner's manual, and replace it on the schedule in your maintenance guide.

Collapsed rubber brake hose

A flexible hose can deteriorate on the inside and act like a one-way valve, holding pressure at the caliper. The symptoms look exactly like a stuck caliper, so check the hose before you condemn the caliper. Replacement brake hoses are inexpensive insurance on a car this age.

How to Diagnose It at Home

1. Drive a few miles without heavy braking, then compare wheel temperatures with an infrared thermometer, or carefully by hand near (not on) each wheel. One wheel much hotter than its partner on the same axle is your suspect.
2. With the car safely on stands, spin each wheel by hand. A healthy brake has light, even drag; a stuck caliper resists noticeably.
3. Pull the pads and compare inner vs outer thickness. A small difference is normal on a floating caliper; a large one is not.
4. On a sliding caliper, remove the guide pins. They should slide freely by hand with clean grease and intact boots.
5. Inspect the piston dust boots and look for wet fluid. Any leak means replace the caliper.
6. Have a helper press and release the pedal while you watch. If the caliper stays clamped until you crack the bleeder, suspect the hose.

The Fix: Replacing the Caliper

If the pins are only dry and the boots are intact, cleaning and fresh high-temperature, rubber-safe brake grease may be all a sliding caliper needs, along with a new brake hardware kit. If a piston is seized, a seal is leaking, or the pin bores are corroded, replace the caliper. Browse replacement brake calipers and match by trim, side and axle, because left and right calipers are not interchangeable and the Brembo and non-Brembo cars use different pads and rotors.

The job on a sliding caliper is moderate for a home mechanic: support the car, remove the wheel, clamp or plug the hose, disconnect the hose at the caliper, unbolt the caliper, install the new one with new sealing washers, and torque every fastener to the factory service manual values. Brembo fixed calipers bolt directly to the knuckle and are heavier; the bolts must be torqued exactly to spec and each caliper must go back on the correct side, with the bleeders at the top.

After any caliper change the system must be bled until clean, bubble-free fluid comes out of that caliper. Many fixed calipers have a bleeder on each half, so bleed every one. Finish by bedding in the pads with a series of moderate stops so they transfer an even layer onto the rotor.

What to Replace at the Same Time

• Pads on both sides of the axle. A dragging caliper overheats and glazes its pads. Fit new brake pads as an axle set so the car stops straight.
• Rotors if they are heat-spotted, scored or under minimum thickness. A caliper that dragged for weeks often ruins its rotor. SRT Hellcat owners can see our EBC SG2 two-piece front rotors for the 2015 Challenger SRT Hellcat; everyone else can shop brake rotors by fitment.
• Hardware and hoses. Clips, pins and boots are wear items. A new hose is worth it if the old one is cracked or suspect.
• Fluid. Opening the system is the right time for a full flush rather than bleeding just one corner.

Replacing calipers in pairs across an axle is not always mandatory, but on a car of this age it is common sense: if one side has corroded, the other has had the same years and weather.

Recalls and Known Defects

NHTSA's recall records for the 2015 Dodge Challenger list campaigns covering the instrument cluster, side air bags, SRT engine components, wiring and the radio, but none for the brake calipers or hydraulic brake system. Caliper problems on these cars are wear and corrosion, not a known defect. It is still worth running your VIN through NHTSA's lookup before any repair to make sure no open recall applies to your car.

Frequently Asked Questions

Can I put Brembo calipers on a 2015 Challenger that did not come with them?

It is a popular upgrade, but it is a package, not a bolt-on caliper. The Brembo cars use different rotors and pads, and larger calipers can require bigger wheels for clearance. Plan it as a complete brake conversion using parts matched to one another.

Why is my inner brake pad worn much more than the outer one?

On a sliding caliper that almost always means seized slide pins or a sticky piston. The outer pad cannot be pulled fully against the rotor, so the inner pad does most of the work. Service or replace the caliper when you replace the pads, or the new pads will wear the same way.

Can I drive with a sticking caliper?

Not for long. A dragging caliper overheats the pads, rotor and fluid, which can fade the brakes and damage the wheel bearing. If you smell hot brakes or see fluid, park the car and fix it.

Do I need to replace both calipers at once?

Only the failed caliper strictly needs replacing, but pads must be replaced on both sides of the axle. Many owners replace calipers as a pair because the other side is the same age and has seen the same weather.

Can I just rebuild my Brembo calipers?

Fixed calipers can be resealed if the pistons and bores are clean and undamaged. If there is pitting in a bore or on a piston, replacement is the safer choice on a car that stops from highway speed as hard as a Challenger can.

Why does the pedal feel soft after replacing a caliper?

Air in the system. Bleed the new caliper again, using every bleeder on a fixed caliper, and check the rest of the system if the pedal still feels spongy.

Sources

1. Stellantis Media - 2015 Dodge Challenger launch release - Brembo four-piston front brakes on R/T Scat Pack and 392 Scat Pack Shaker, 117-foot 60-0 stop, Super Track Pak high-performance brakes on all trims including V-6
2. Stellantis Media - 2015 Dodge Challenger SRT press kit - 390-mm (15.4-inch) Brembo two-piece front rotors with six-piston calipers; uniquely tuned ABS
3. NHTSA recall records - 2015 Dodge Challenger - recall campaigns on file, none covering brake calipers or hydraulics
4. Free ASE Study Guides - Sticking Brake Caliper Guide Pins - seized pins cause inner and tapered pad wear; bad piston seals cause drag