1991-1996 Dodge Stealth Brake Noise: Squeal, Grinding and Pulsation Causes

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most brake noise on a 1991-1996 Dodge Stealth comes from three sources: pads that are worn to the backing plate or missing their anti-noise shims (squeal and grinding), rotors with thickness variation from hub rust or uneven lug torque (pedal pulsation), and caliper hardware that has lost its tension (rattle and clunk). On a car this old, add one more: aged rubber brake hoses, which were the subject of a factory recall on the early cars. The fix is almost always a matched set of pads, rotors and hardware installed on a clean hub, then bedded in properly.

How the Stealth Brake System Works

The Stealth was built by Mitsubishi alongside the 3000GT, and it uses disc brakes at all four wheels. The top R/T Twin Turbo pairs those brakes with all-wheel drive and standard anti-lock brakes; on other trims ABS depends on how the car was built, and the NHTSA notes for the front hose recall cover cars both with and without ABS. That matters for diagnosis, because a car with ABS has a wheel speed sensor and tone ring at each corner that can also produce noise or a warning light when damaged.

The front brakes do most of the work. When you press the pedal, the master cylinder pushes fluid through steel lines and then short flexible rubber hoses to each caliper. The caliper squeezes the pads against the rotor, and the pads slide on the caliper bracket against spring-steel abutment clips. Every one of those contact points is a place where vibration can start, and vibration is what you hear as noise.

Squeal: What It Means and How to Find It

Wagner's technical guidance puts it simply: vibration is the main source of noise in a brake system. A high-pitched squeal on a Stealth usually comes from one of these:

• Wear indicators. Many pads carry a small steel tab that touches the rotor when the friction material is nearly gone. A steady squeal while driving that changes when you press the pedal is the classic sign. Pull the wheels and look at what is left.
• Missing or dried-out shims. The shim insulators on the back of the pad damp vibration between the piston and backing plate. Wagner recommends a light coat of silicone brake lubricant on the back of pre-attached shims, and a noise compound on pads supplied without shims. Some pad designs specifically say no compound should touch the insulator, so follow the instructions that come with your pads.
• Tired abutment clips. Wagner notes that anti-rattle clips and springs can lose their spring tempering from brake heat. A 30-year-old clip lets the pad move and sing. Replace the clips with every pad job.
• Glazed pads or rotors. Pads that were never bedded in, or were cooked by a hard drive, develop a shiny surface that squeals under light braking.
• Dirt and grit. Wagner recommends washing rotors with soap and water and a bristle brush to remove dust and grit before installation.

To narrow it down, note when the squeal happens. Squeal while driving without the brakes applied points to a wear indicator or a dragging pad. Squeal only under light braking points to shims, clips or glaze. Squeal only on cold, damp mornings is often a thin layer of surface rust that wipes off in a few stops and is not a fault.

Grinding: Stop Driving and Inspect

Grinding is metal on metal, and it usually means the pad backing plate is contacting the rotor. On a Stealth that has sat for long periods, which is common for collector cars, grinding can also come from a pad that has rusted to the bracket or separated from its backing plate. Other causes include a stone caught between the rotor and the dust shield, or a dust shield bent into the rotor edge.

Grinding damages the rotor quickly. Once the backing plate has scored the surface, the rotor usually needs replacing, because machining out deep grooves tends to take it below its minimum thickness. The minimum thickness is marked on the rotor itself; check it with a micrometer rather than guessing.

Pulsation: Rotor Thickness Variation, Not Warping

A pedal that pulses or a steering wheel that shakes while stopping is almost always disc thickness variation, or DTV. Wagner explains that as the thin and thick sections of the rotor pass through the caliper, they displace fluid and push the pistons back and forth, and you feel that movement in the pedal.

DTV usually starts with lateral runout, the side-to-side wobble of a spinning rotor. Wagner states that most vehicles have lateral runout specifications of two thousandths of an inch or less. When the rotor wobbles, the high spot rubs the pad on every revolution. With semi-metallic pads that wears the rotor thin in one area; with ceramic pads it can leave uneven pad material deposits. Either way, the thickness becomes uneven over time.

Power Stop gives a useful benchmark: thickness should vary by no more than .001 inch (0.025 mm) when measured at six or more spots around the rotor, and variation larger than .006 inch (0.15 mm) indicates DTV that calls for replacement. Power Stop also points out that damaged suspension bushings can produce vibration that feels like a rotor problem, which is worth checking on a heavy car of this age.

Wagner identifies hub rust as the main culprit, calling it a stacked tolerance problem. Even a small flake of rust on the hub face tilts a new rotor. Clean the hub face to bare metal before mounting any rotor, and tighten the lug nuts evenly in a star pattern to the value in the factory service manual using a torque wrench, not an impact gun.

The Brake Hose Recall and Aging Hydraulics

NHTSA campaign 96V143 covers 1991-1994 Stealth models. Chrysler reported that under full-lock steering and full suspension travel, the left or right front wheel-side brake hose can crack and leak fluid, which lights the brake warning lamp and reduces braking effectiveness. The remedy was replacement of both front hoses with revised assemblies. If you own an early car, ask a Dodge dealer whether the campaign was completed on your VIN.

Whether or not the recall was done, the rubber hoses on any Stealth are now decades old. A hose that has collapsed internally can hold pressure at one caliper, causing a dragging pad that squeals, overheats the rotor and creates the exact deposits that lead to pulsation. If one wheel is much hotter than the others after a drive, suspect a hose or a sticking caliper. Fresh replacement brake hoses and, if a piston is seized, replacement brake calipers fix the root cause instead of just the noise.

The Fix: Parts and What to Replace Together

For a quiet, smooth Stealth, replace parts as a set:

1. Pads with shims. Front pads such as the EBC Redstuff ceramic front pads for the 1991-1996 Stealth 3.0 2WD are one option for the front-drive cars. Browse all brake pads or ceramic brake pads and match by trim, since the all-wheel-drive Twin Turbo does not share every brake part with the front-drive cars.
2. Rotors. If the rotors are grooved, below minimum thickness, or show DTV, replace them in pairs across the axle. See brake rotors.
3. Hardware. New abutment clips, pins and boots from a brake hardware kit. Lubricate slide pins with high-temperature brake grease.
4. Fluid. Flush with the fluid type printed on the master cylinder cap. Old, moisture-laden fluid corrodes caliper bores and contributes to sticking.

Finish by bedding in the new pads. Wagner's burnish procedure for its pads is 20 slow-downs from 50 mph to 20 mph with light pressure, allowing 30 seconds between each. Follow the procedure supplied with whichever pads you install, and avoid sitting with the brakes held hard right after the final hot stop.

How Hard Is the Job?

A front pad and rotor job on a Stealth is a moderate DIY task with basic hand tools, a torque wrench, jack stands and a piston tool. Allow a couple of hours per axle the first time, plus time to clean rusted hub faces properly. Hose replacement and bleeding add time and need a helper or a pressure bleeder, and ABS-equipped cars should be bled the way the service manual describes. If you are not confident with hydraulic work, have a shop handle the hoses and bleeding even if you do the pads yourself.

Frequently Asked Questions

Why do my new Stealth brakes squeal right after a pad change?

The usual causes are shims left off or not lubricated per the pad instructions, old abutment clips reused, or pads not bedded in. Pull the pads, confirm the shims and clips are in place, and repeat the bedding procedure.

Are my rotors warped if the pedal pulses?

Almost never literally warped. The pulse comes from thickness variation that develops from runout, usually caused by rust on the hub face or uneven lug torque. Measure thickness at several points around the rotor to confirm.

Can I resurface my Stealth rotors instead of replacing them?

Only if they will stay above the minimum thickness marked on the rotor after machining. Rotors deeply scored by metal-to-metal grinding usually cannot be saved.

Does the brake hose recall apply to my car?

NHTSA lists campaign 96V143 for 1991-1994 Stealth models. A Dodge dealer can check by VIN whether it was completed. On any Stealth, hoses this old are worth inspecting for cracks and swelling.

Are ceramic pads quieter on a Stealth?

Ceramic pads are often chosen for low dust and low noise, but installation matters more than compound. A ceramic pad on a rusty hub with old clips will still squeal and pulse.

Sources

1. NHTSA recall database, Dodge Stealth - campaign 96V143 front brake hose cracking, consequence and remedy, ABS and non-ABS cars
2. Wagner Brake - Brake System Noise - vibration as noise source, shims, clips, rotor washing, burnish procedure
3. Wagner Brake - Brake Pedal Pulsation and Disc Thickness Variation - DTV mechanism, runout spec, hub rust
4. Power Stop - Why Do I Have a Pulsing Brake Pedal - DTV measurement limits, suspension bushings, pad deposits
5. Auto123 - 1996 Dodge Stealth R/T Twin Turbo specifications - four-wheel disc brakes, standard ABS, all-wheel drive