2018-2023 Chevrolet Traverse Brake Caliper Problems and Replacement

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most caliper trouble on a 2018-2023 Chevrolet Traverse comes from two places: front calipers sticking on corroded slide pins, and rear calipers, which carry the Electric Parking Brake (EPB) and must be put into service mode before anyone pushes a piston back. A pull to one side, a hot wheel, one pad worn far thinner than its partner, or a flashing parking brake light all point to the caliper. Replacing one is a moderate DIY job up front and a more involved one at the rear because of the EPB.

How the Brakes Work on the Second-Generation Traverse

The 2018-2023 Traverse uses disc brakes at all four corners with floating calipers: the caliper rides on two slide pins in a bracket, so the piston pushes the inboard pad and the caliper body pulls the outboard pad against the rotor. That design is simple and reliable as long as the pins can slide freely.

The big change from the first-generation truck is the parking brake. Chevrolet's owner's manual for this generation describes an Electric Parking Brake operated by a console switch rather than a pedal or lever. The parking brake is applied at the rear calipers by an electric actuator, so each rear caliper is both a hydraulic brake and the parking brake. The manual also notes that the vehicle may automatically apply the EPB on its own while it is not moving to check that the system works, which matters when you have the rear apart.

Brake fluid is DOT 3. The manual calls for GM approved DOT 3 brake fluid from a clean, sealed container and says to replace the fluid every five years, because brake fluid absorbs water over time and degraded fluid increases stopping distance. That same moisture is what corrodes caliper bores and pistons from the inside.

Symptoms of a Bad Caliper on a Traverse

• Pulling to one side under braking or even while cruising. A caliper that will not release keeps dragging one wheel.
• One wheel much hotter than the others after a drive, sometimes with a burning smell from that corner.
• Uneven pad wear. Brake and Front End notes that excessive wear of the inboard pad indicates the caliper is not moving freely on its bracket. If the inner and outer pads on one wheel are very different thicknesses, or one side eats pads much faster than the other, suspect the caliper.
• Brake fluid on the inside of the wheel or tire, or a dropping reservoir level. The manual says the level only goes down from normal lining wear or a leak, and a leak must be repaired, not topped off.
• Pad noise. ADVICS lists brake pad noise and excessive pad wear as the main signs of sticking slide pins.
• Parking brake warnings. If the PARK light flashes continuously, the manual says the EPB is only partially applied, the vehicle is in Service Mode, or there is an EPB problem, and not to drive while it flashes. A Service Parking Brake light that stays on points to a rear actuator, its wiring, or the control system.

Also know what is normal. The Traverse's pads have built-in wear indicators that make a high-pitched sound when the pads are worn out. That is a pad problem, not a caliper problem, but ignoring it long enough damages rotors and pushes pistons farther out of their bores than they should go.

What Causes Traverse Calipers to Stick or Fail

Slide pins are the most common and cheapest problem. ADVICS traces sticking pins to the grease running out, rust forming, and the pin boots breaking down from heat and friction; the fix is to check the pins for rust, replace them if needed, regrease them, and replace damaged boots and sleeves. Brake and Front End also points to corroded brackets and worn bushings and seals, which throw off caliper alignment and wear the pads unevenly. Road salt makes all of this worse, so Traverse owners in the snow belt see it most.

A NHTSA recall lookup for the 2018 Traverse returns campaigns for a transmission issue and side curtain air bags, but none for brakes or calipers. Caliper failures on these trucks are wear and corrosion items, not a known factory defect. Run your own VIN through NHTSA before paying for any repair, since recall work is free.

Replacing a Front Caliper

A front caliper swap is a reasonable driveway job with hand tools, a torque wrench, a flare-nut wrench, and a way to bleed the brakes.

1. Loosen the lug nuts, lift and support the truck on stands, and remove the wheel.
2. Limit fluid loss at the hose, then disconnect it from the caliper. Keep brake fluid off paint.
3. Remove the caliper guide bolts and lift the caliper off. Inspect the bracket, pins and boots while it is apart.
4. Install the new or remanufactured caliper. Fit new pads if the old ones are fluid-soaked or worn unevenly, clean the bracket abutments, install fresh pad hardware, and grease the slide pins with a brake-specific lubricant.
5. Connect the hose with new sealing washers. Cardone's guidance for aluminum calipers is to hand-thread the steel banjo bolt and bleeder for the first several turns so they do not cross-thread the softer casting, and not to over-tighten. Torque every fastener to the value in the factory service manual.
6. Bleed the caliper with fresh DOT 3, pump the pedal until it is firm before moving the truck, and set the reservoir level.

Replacing a Rear Caliper: The EPB Step You Cannot Skip

The rear is where Traverse caliper jobs go wrong. Because the parking brake actuator drives the rear piston, you cannot simply push the piston back with a C-clamp. Vehicle Service Pros explains that the parking brake system must be placed in service mode, also called maintenance mode, before rear brake service, and that the caliper can be damaged if the piston fully extends during an uncommanded EPB actuation while the caliper is detached. Depending on the vehicle, service mode is entered with a scan tool that has EPB functions or with a driver-seat sequence. The Traverse owner's manual confirms the truck has a Service Mode and flashes the PARK light while in it.

The rear sequence in outline:

1. With the truck on level ground and the wheels chocked, put the EPB in service mode so the actuators retract.
2. Lift and support the rear, remove the wheel, and unplug the actuator connector.
3. Disconnect the hose, remove the caliper, and inspect the pins, bracket and rotor.
4. Install the replacement caliper and pads, reconnect the hose with new washers, and plug the actuator back in. Check whether the replacement caliper includes the actuator motor or reuses yours.
5. Bleed the caliper, then exit service mode so the EPB can apply. Confirm the PARK light comes on steadily when applied and goes out when released.
6. Clear any codes and road test. If the Service Parking Brake light stays on, have the system scanned.

If you have no way to enter service mode, this is the part of the job worth handing to a shop. A short scan tool session costs far less than a ruined new caliper.

What to Replace at the Same Time

• Pads on both sides of the axle. The manual says brake pads should be replaced as complete sets, and a caliper that dragged has usually glazed or tapered its pads. See our brake pads, or for this truck the 2018-2023 Traverse rear ceramic brake pads.
• Rotors if they are scored, under minimum thickness, or blued from heat. A dragging caliper cooks its rotor. Browse brake rotors.
• Hardware and pins. New clips and pin boots are inexpensive and keep the new caliper sliding. See brake hardware kits.
• The hose if it is cracked or swollen; a hose that restricts flow can hold pressure on a caliper and mimic a stuck piston. See brake hoses.
• Fluid. If the five-year interval is close, flush the whole system while it is open.

Many shops replace calipers in axle pairs so both sides apply evenly, especially on a high-mileage truck where the other side is the same age. Shop brake calipers and Cardone remanufactured calipers.

Frequently Asked Questions

Can I push the rear caliper piston back with a C-clamp on a 2018-2023 Traverse?

No. The rear calipers carry the Electric Parking Brake, so the system has to be put into service mode first so the actuator retracts. Forcing the piston can damage the actuator or the caliper.

Why does my Traverse pull to one side and one wheel smell hot?

That is the classic sign of a caliper that is not releasing, from a seized piston, stuck slide pins, or a restricted hose. Compare pad wear side to side; the dragging wheel will show thinner or tapered pads.

What brake fluid does the Traverse use?

Chevrolet specifies GM approved DOT 3 brake fluid and recommends replacing it every five years. Use fluid from a sealed container and bleed each caliper you replace.

Is there a recall for Traverse brake calipers?

NHTSA's recall list for the 2018 Traverse does not include a brake or caliper recall. Check your own VIN, since campaigns can be added.

Do I need to replace calipers in pairs?

It is not strictly required, but replacing both on the axle keeps braking even and avoids a second job soon after on an older truck. Pads should always be replaced as an axle set.

What does a flashing PARK light mean?

Chevrolet says it means the parking brake is only partially applied, the vehicle is in Service Mode, or there is an EPB problem. Do not drive while it flashes; release and reapply it, and have it serviced if it continues.

Sources

1. 2019 Chevrolet Traverse Owner's Manual - Electric Parking Brake operation, auto-apply check, Service Mode and warning lights, pad wear indicators, pads replaced as sets, DOT 3 fluid, five-year fluid replacement
2. NHTSA recalls for the 2018 Chevrolet Traverse - recall list with no brake or caliper campaign
3. Vehicle Service Pros: Electronic parking brake operation and diagnosis - service mode before rear brake work, caliper damage from uncommanded actuation
4. Brake and Front End: Brake Caliper Diagnostics - inboard pad wear from restricted caliper movement, bracket corrosion, bushings and seals
5. Brake and Front End: Cardone tech tip on installing aluminum calipers - hand-threading banjo bolts and bleeders, avoiding over-tightening
6. ADVICS: Troubleshooting caliper slide pin sticking - symptoms and causes of sticking slide pins, regreasing and boot replacement