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2020 G70 3.3T - Brake Pulsation/Vibration when Stopping

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Chris P. · rep 0 · May 22, 6:18 AM · 1 replies · solved · Question

Vehicle: 2020 Genesis G70 3.3T

Hey everyone,

I've been noticing a strange issue with my 2020 Genesis G70 3.3T lately. When I apply the brakes, especially at highway speeds or when coming to a stop from higher speeds, I feel a distinct pulsation or vibration through the brake pedal and sometimes the steering wheel. It's not constant, but it's definitely noticeable and a bit concerning.

It feels like the rotors might be warped, but the car only has about 40,000 miles on it, and I haven't been particularly hard on the brakes. I'm running the stock Brembo setup. Has anyone else experienced this with their G70, or any Genesis model for that matter?

What could be causing this? Is it likely warped rotors, or could it be something else entirely? Any advice on what to check or if I should just take it straight to the dealer would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:18 AM

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ClearTheCode admin answer:

Brake pulsation or vibration during braking is a common complaint and can be attributed to several factors, most commonly related to the brake rotors or calipers. Here's a breakdown of potential causes and steps you can take:

  1. Warped Brake Rotors (Disc Thickness Variation - DTV): This is the most frequent cause. While rotors don't technically "warp" in the traditional sense, uneven heat distribution or improper brake pad material transfer can lead to variations in the rotor's thickness or surface. When the brake pads contact these uneven surfaces, it causes the pulsation you feel. This can be exacerbated by hard braking followed by holding the brake pedal down while stopped, which can imprint pad material onto a hot rotor.

  2. Sticking Brake Calipers: If a caliper piston or slide pin is sticking, it can cause uneven pressure on the rotor, leading to localized overheating and DTV. It can also cause the pads to drag, generating excessive heat.

  3. Wheel Bearing Issues: Less common for pulsation, but a worn wheel bearing can introduce play that affects how the rotor spins, leading to vibration during braking.

  4. Suspension Components: Worn ball joints, tie rod ends, or control arm bushings can sometimes manifest as vibrations during braking, as the braking forces highlight any looseness in the suspension.

  5. Tire Imbalance or Runout: While usually felt at speed, severe tire imbalance or excessive tire/wheel runout can sometimes be amplified during braking.

When to See a Shop:

Given that your 2020 Genesis G70 3.3T has 40,000 miles, it's a good idea to have a professional inspection. Here's what they should check:

  • Rotor Runout and Thickness: A technician can measure the lateral runout (wobble) and disc thickness variation (DTV) of your rotors. If these are out of specification, the rotors will need to be replaced or, if possible, resurfaced (though replacement is often recommended for performance vehicles like the G70).
  • Brake Pad Wear: Ensure pads are wearing evenly and have sufficient material remaining.
  • Caliper Operation: Check that the calipers are moving freely and that the pistons are retracting properly. Lubricate slide pins if necessary.
  • Wheel Bearings and Suspension: Inspect for any play or wear in the wheel bearings and front suspension components.
  • Tire and Wheel Balance/Runout: Rule out tire-related issues.

While there isn't typically an OBD-II code for brake pulsation directly related to rotors, a shop can also check for any stored ABS or traction control system codes, which could indicate a sensor issue, though this is less likely to cause a pedal pulsation.

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