2015 Dodge Challenger Brake Noise: Squeal, Grinding and Pulsation Causes

By Core Brake Parts Tech Team — Circleville, OH warehouse

Brake noise on a 2015 Dodge Challenger almost always falls into one of three buckets: a high-pitched squeal (pad vibration, a worn wear indicator, missing shims or dry slide points), a metal-on-metal grind (pads worn to the backing plate or debris trapped at the rotor), or a pulsation you feel in the pedal (uneven pad deposits or thickness variation on the rotor). Which one you have, and which brake package your car carries, decides the fix.

The 2015 Challenger was sold with very different brake setups, from a single-piston sliding caliper on the SXT to six-piston Brembos on the SRT models. Identify yours first, because the pads, rotors and even the typical noise differ between them.

Which Brakes Does Your 2015 Challenger Have?

Chrysler's 2015 Challenger specifications list three packages on the non-SRT cars, and the SRT press kit covers the 392 and Hellcat. Look through the wheel spokes: a caliper with slide pins on the inboard side that floats on a bracket is a sliding caliper; a painted Brembo caliper bolted rigidly across the rotor with pistons on both sides is a fixed multi-piston unit.

The first three rows come from Chrysler's published 2015 Challenger specification sheet; the SRT row comes from the 2015 Challenger SRT press kit. Option groups moved some cars between packages, so confirm on the car or with your VIN before ordering parts.

Squeal: The Most Common Challenger Brake Noise

A squeal is the pad vibrating against the rotor at a frequency you can hear. Brembo's own service guidance makes the point that squeal after new parts go in is often not a defect in the new part at all, but comes from the poor condition of the other components in the system. On a Challenger, check these in order:

• Wear indicator. A steady squeal while driving that changes when you touch the pedal is often the metal wear tab on the pad touching the rotor. That is the pad telling you it is near the end. Pull a wheel and look at how much friction material is left.
• Anti-noise shims. Brembo advises using the shims correctly and not reusing old ones. A shim that is missing, bent or sitting crooked cannot damp the pad.
• Dry contact points. On the sliding calipers (SXT, R/T and the Performance package), the pad ears ride in the caliper bracket. Brembo calls for anti-noise grease on the bracket and pad contact surfaces. Dry or rusty abutments let the pad chatter.
• Caliper springs. Worn anti-rattle springs, or springs installed in the wrong position, let the pads move and sing. This matters most on the fixed Brembo calipers on Scat Pack and SRT cars. Brembo recommends inspecting and replacing worn springs and confirming their position.
• Rotor condition. Brembo recommends always replacing pads when rotors are changed and inspecting the rotor whenever pads go in. A new pad on a grooved or glazed rotor rarely stays quiet.

Performance pads on the Brembo cars also tend to make more low-speed noise than a daily-driver ceramic pad, especially when cold. That is a trait of the friction material, not a fault.

Grinding: Stop Driving and Look

Grinding is more serious than squeal. The usual causes are:

• Pads worn through. Once the friction material is gone, the steel backing plate cuts into the rotor. The rotor is then almost always scrap, and the piston is pushed out past its normal travel.
• Debris between pad and rotor. A small stone trapped at the caliper or between the rotor and the dust shield makes a harsh scraping noise, often only at low speed or in one direction.
• Rust and dust shield contact. A car that sits, which describes a lot of weekend Challengers, builds rust on the rotor face and edge. A light grind for the first few stops after sitting that goes away is usually surface rust. A bent dust shield touching the rotor makes a constant scrape.
• Seized slide pins or piston. A pad that stays in contact because the caliper will not release wears fast and grinds. Brembo recommends checking pistons, seals, dust boots and sliding elements for correct operation whenever the brakes are serviced.

If you hear a grind, pull the wheels. Replacing pads alone when the backing plate has cut the rotor leaves you with a noisy, weak brake.

Pulsation: Why the Pedal Shakes

A pulsing pedal or a shimmy in the steering wheel during braking is usually blamed on warped rotors, but the rotor has rarely warped. Power Stop explains that pulsation comes from high spots on the rotor, and that very little uneven material is needed: their article says only .0007 inches is enough to start to feel it. Two ways those spots form:

• Uneven pad deposits. Pad resin that overheats can glaze onto the rotor unevenly.
• Pad imprinting. Holding the pedal at a stop after a hot run leaves a pad-shaped deposit on the stationary rotor. The Challenger is a heavy car (Chrysler lists preliminary curb weights of 1,735 kg / 3,834 lb for the SXT and 1,852 kg / 4,082 lb for the R/T), so it puts a lot of heat into its brakes and this is easy to cause after a spirited drive.

Mounting matters too. Brembo lists maximum disc runout of 0.10 mm measured on the hub and maximum hub runout of 0.050 mm, and calls for cleaning rust and debris from the disc-to-hub face and tightening wheel fasteners to the correct torque. Rust on the hub face or uneven lug torque creates runout, which turns into thickness variation over the following miles. Torque the lug nuts to the value in your owner manual, in a star pattern, with a torque wrench.

The Fix and Which Parts to Replace

Match the part to the package in the table above. Rotor sizes differ on every package, so a rotor for an SXT will not fit a Scat Pack Brembo car.

1. Squeal with good pad life left: clean and lubricate the contact points, replace shims and anti-rattle springs, and service the slide pins. Often no new friction parts are needed.
2. Squeal from the wear indicator, or grinding: new brake pads and new brake rotors on that axle, plus a fresh brake hardware kit. For a quiet, low-dust daily driver, ceramic brake pads are the usual choice.
3. Pulsation: measure rotor thickness variation and runout. If the rotor is within spec, a proper bed-in can sometimes clean off light deposits. If not, replace the rotors and bed in new pads.
4. Sticking caliper: rebuild or replace it. Replacement units are in our brake calipers collection.

For Hellcat owners who want an upgrade over the stock two-piece front rotors, we carry the EBC Racing SG2 two-piece floating front rotors for the 2015+ Challenger SRT Hellcat.

Bed in every new pad. Power Stop's procedure is five moderate-to-aggressive stops from 40 mph to 10 mph without cooling, five moderate stops from 35 mph to 5 mph, then about five minutes of driving at moderate speed so the brakes can cool. Do not sit at a stop holding the pedal hard right after. Brembo notes that full bedding takes about 300 km of normal driving.

What to Replace at the Same Time, and How Hard the Job Is

• Brake fluid: Brembo recommends checking that the level sits between the min and max marks and replacing the fluid every two years or per the manufacturer schedule. Use the fluid type printed on your reservoir cap.
• Hardware: clips, shims and springs are cheap and are the most common cause of noise comebacks.
• Both sides of the axle: always replace pads and rotors in axle pairs.

On the sliding-caliper SXT and R/T, a front pad and rotor job is a reasonable driveway project with basic hand tools, a piston tool and a torque wrench. The fixed Brembo calipers on the Scat Pack and SRT cars make pad swaps simple, but the rotors are large and heavy, the two-piece SRT rotors are expensive to damage, and every caliper bolt torque must come from the factory service information.

Frequently Asked Questions

Why do my new Challenger brakes squeal?

Most often the old shims or springs were reused, the pad contact points were not lubricated, the pads went onto worn rotors, or the pads were not bedded in. Brembo notes that noise after new parts is usually caused by the condition of the rest of the system rather than the new part.

Is it safe to drive a 2015 Challenger with grinding brakes?

No. Grinding usually means the pad backing plate is contacting the rotor, which reduces braking and destroys the rotor quickly. Inspect the brakes before driving further.

Are my rotors warped if the pedal pulsates?

Usually not. Pulsation is normally caused by uneven pad deposits or thickness variation on the rotor, often started by poor bed-in, hot stops or hub runout.

Do Scat Pack and Hellcat brake parts interchange?

No. The Scat Pack Brembo package uses 360 mm front rotors with four-piston calipers, while the SRT 392 and Hellcat use 390 mm two-piece front rotors with six-piston calipers. Order by package.

Can the rear brakes cause the noise?

Yes. Every 2015 Challenger package listed in Chrysler's specifications uses rear discs, so the same squeal, grind and pulsation causes apply at the rear. Check both axles.

Sources

1. Chrysler Canada - 2015 Dodge Challenger Specifications - brake package names, rotor and caliper sizes by trim, curb weights
2. Stellantis Media - 2015 Dodge Challenger SRT press kit - 390 mm Brembo two-piece rotors and six-piston calipers on SRT 392 and Hellcat
3. Brembo - Noises and vibrations - squeal causes, shims, springs, grease, runout limits, fluid interval, 300 km bedding
4. Power Stop - Why Do Brake Pedals Vibrate? - pulsation from rotor deposits, .0007 in threshold, break-in procedure