2011-2016 Hyundai Genesis Coupe Brake Caliper Problems and Replacement

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most caliper trouble on a 2011-2016 Hyundai Genesis Coupe comes down to three things: a piston or slide that has started to stick, a leaking piston seal, or pads that were allowed to wear to the backing plate. On Brembo-equipped cars the fix is often a seal rebuild rather than a new caliper, while base cars usually get a straight caliper swap. Before you blame a caliper for an ABS or brake warning light, check whether the car has had its ABS recall fuse done, because that is a separate, known issue.

Which Brakes Does Your Genesis Coupe Have?

The Genesis Coupe was sold with two very different brake packages, and the right caliper, pad and rotor depend on which one is on your car. Brembo-equipped trims (the R-Spec and Track style trims, among others) use large fixed calipers with the Brembo name cast on the body and a big front rotor. Alcon lists the front rotor on the 2.0T R-Spec at 340mm by 28mm (13.39 by 1.10 inches), cross-referenced to Hyundai part 517122M700. Base trims use a smaller rotor and a conventional caliper that does not carry the Brembo name.

The fastest way to tell is to look through the wheel spokes. If the caliper has the Brembo logo and pistons on both sides of the rotor, it is a fixed caliper. If it sits on one side of the rotor and slides on pins, it is a floating (sliding) caliper. Order parts only after you have confirmed which one you have, because pads, rotors and calipers do not interchange between the two packages.

Symptoms of a Failing Caliper

A caliper problem usually shows up as something that changes on one corner of the car, not all four. Watch for these signs:

• Pull to one side under braking. One caliper is either not applying fully or not releasing, so that corner does more or less work than its partner.
• A hot wheel after a normal drive. A dragging caliper keeps the pads against the rotor. That wheel will be noticeably hotter than the others and may smell of burnt friction material.
• Uneven pad wear. On a fixed Brembo caliper, one pad worn much thinner than the other, or a pad worn into a taper, points to a piston that is sticking. On a floating caliper it usually means a seized slide pin.
• Fluid on the inside of the wheel or tire. A wet caliper body or a damp inner sidewall means a piston seal or bleeder is leaking. Do not drive on a leaking caliper; the fluid level will drop and pedal feel will get worse.
• Soft or sinking pedal. A leaking seal can let air in or fluid out. Check the reservoir level and look for wet spots at every corner.
• Grinding. A dragging caliper can wear its pads to the backing plate faster than you expect. At that point the rotor is usually damaged too.

What Causes Genesis Coupe Caliper Problems

Most caliper failures on this car come from age and neglect rather than a design defect. The piston dust boots are rubber, and once one tears, road grit and water get behind it. The piston surface corrodes, the seal can no longer retract it cleanly, and the piston starts to hang up. Brembo fixed calipers have several pistons each, so there are more boots and seals that can wear out, and a single sticking piston is enough to cause tapered pad wear.

Old brake fluid makes this worse. Brake fluid absorbs moisture over time, and wet fluid corrodes pistons and bores from the inside. NHTSA's recall report for this generation also names moisture, dirt and dissolved metals in the fluid as factors that can degrade seals in the ABS unit, which is a good reminder that fluid condition affects the whole hydraulic system, calipers included. Flush the fluid at the interval in your owner's manual, using the fluid type printed on the reservoir cap.

On base cars with floating calipers, the most common cause is a slide pin that has lost its grease or had its boot torn. The pin rusts, the caliper can no longer float, and one pad drags while the other barely touches the rotor.

The ABS Recall: Rule It Out First

If your warning lights are on, check the recall status before you replace any brake parts. Under NHTSA recall 23V-651 (Hyundai campaign 251), Hyundai recalled 51,789 model year 2011-2015 Genesis Coupe vehicles built from September 1, 2010 to October 31, 2014. The report says the ABS module can leak brake fluid internally and short out over time, which raises the risk of an engine compartment fire while parked or driving.

The warning signs Hyundai listed are smoke from the engine compartment, a burning or melting odor, and the MIL and/or ABS light coming on. The remedy is a lower-amperage ABS fuse installed by a dealer at no cost, and Hyundai recommended parking outside and away from structures until the fix is done. An ABS light by itself does not mean a caliper has failed, so get the recall done and scan the ABS codes before you start replacing parts.

Rebuild or Replace the Caliper?

For Brembo-equipped cars, a rebuild is a practical option when the caliper body and piston bores are in good shape. GiroDisc sells a front caliper rebuild kit for the Brembo-equipped Genesis Coupe that includes the dust boots and piston seals for one caliper. A rebuild makes sense when a boot is torn or a seal is weeping but the pistons and bores are smooth. If a piston is pitted or the bore is corroded, new seals will not stop the leak or the sticking, and the caliper should be replaced.

On base cars, replacement is usually the better use of your time. Browse our replacement brake calipers and always replace the pads at the same time. Calipers are normally replaced in pairs on an axle so both sides clamp evenly.

Whichever way you go, the job involves:

1. Securing the car on stands and removing the wheel.
2. Clamping the flexible hose (or capping the line) to limit fluid loss, then disconnecting the banjo bolt or line fitting.
3. Removing the caliper mounting bolts and the pads.
4. Installing the new or rebuilt caliper with new pads and fresh copper crush washers at the banjo fitting.
5. Torquing the caliper and banjo bolts to the values in the factory service manual.
6. Bleeding the brakes. Brembo fixed calipers commonly have an inner and an outer bleeder; bleed both, inner first, until the fluid runs clear with no bubbles.

This is a moderate DIY job for someone who has done a pad change and bled brakes before. If you have never bled a hydraulic system, have a shop do the bleed, because air in the lines means a soft pedal and longer stops.

What to Replace at the Same Time

A failing caliper almost always damages the parts around it, so plan for these while the wheel is off:

• Pads. Pads that have been dragging are often glazed or heat-damaged. On 2014-2016 Brembo cars the front pad uses a common Brembo shape; Hawk lists its HB453 family for 2014-2016 Genesis Coupe 3.8 and 2.0T fronts. Shop our brake pads or ceramic brake pads for a quiet, low-dust street choice.
• Rotors. A sticking caliper overheats the rotor and can leave hot spots or scoring. For Brembo-equipped cars we carry the DBA 4000 Series T3 slotted front rotor for the 2011-2016 Genesis Coupe and the DBA 4000 Series T3 slotted rear rotor for the 2013 Track and R-Spec. Other options are in our brake rotors collection.
• Hardware. Pad pins, anti-rattle clips and slide pin boots are cheap and often worn. See brake hardware kits.
• Hoses. A rubber hose that is cracked or swollen can act like a check valve and hold pressure on a caliper, which mimics a sticking piston. Replace it if it looks tired; see brake hoses.
• Fluid. Any caliper job opens the system. Flush the whole system rather than just bleeding the one corner.

Frequently Asked Questions

How do I know if my Genesis Coupe has Brembo brakes?

Look through the wheel. Brembo calipers have the Brembo name cast or printed on the body and pistons on both sides of the rotor. A caliper that sits on one side and moves on slide pins is the base setup.

Can I rebuild a Brembo caliper myself?

Yes, if the piston bores and pistons are clean and smooth. Rebuild kits with new dust boots and seals are sold for the Brembo-equipped Genesis Coupe. If a piston is pitted or corroded, replace the caliper instead.

Should I replace calipers in pairs?

Yes, on the same axle. A new caliper on one side and an old one on the other can clamp unevenly and cause a pull. Always install new pads with any caliper replacement.

My ABS light is on. Is that a bad caliper?

Usually not. A caliper problem rarely sets the ABS light. For 2011-2015 Genesis Coupes, check that the ABS recall (NHTSA 23V-651, Hyundai 251) has been completed, then scan for ABS codes.

Why is only one wheel hot after driving?

That corner's caliper is not releasing. On a Brembo caliper it is usually a sticking piston; on the base caliper it is usually a seized slide pin or a collapsed brake hose.

Do I need to bleed the brakes after replacing a caliper?

Yes. Opening the line lets air in. Bleed the caliper you replaced, and on Brembo calipers bleed both bleeders. A full fluid flush at the same time is good practice.

Sources

1. NHTSA Part 573 Safety Recall Report 23V-651 - Genesis Coupe ABS module recall population, build dates, defect cause, warning signs and fuse remedy
2. GiroDisc Genesis Coupe (w/ Brembo) Front Caliper Rebuild Kit - rebuild kit contents: dust boots and piston seals for one caliper
3. Hawk Performance HB453F.585 application list - 2014-2016 Genesis Coupe front pad fitment and shared Brembo pad shape
4. Alcon Genesis Coupe 2.0T R-Spec front rotors - 340mm x 28mm front rotor size and OE part number 517122M700