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Brake Pedal Vibration at Speed - 2019 Audi Q7

0

Mike T. · rep 0 · May 25, 3:13 AM · 1 replies · solved · Question

Vehicle: 2019 Audi Q7 3.0T

Hey everyone, I'm experiencing a strange issue with my 2019 Audi Q7 3.0T, which has about 50,000 miles on it. When I apply the brakes, especially at highway speeds (above 45-50 mph), I feel a distinct vibration or pulsation through the brake pedal.

It's not a grinding noise, and the car still stops effectively, but the vibration is quite noticeable and a bit unsettling. It seems to get worse the harder I brake from higher speeds. At lower speeds or light braking, it's barely perceptible.

I haven't had any brake work done recently, and the brake fluid level looks fine. Has anyone else encountered this with their Q7 or other Audi SUVs? What might be causing this pulsation? Thanks for your help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:13 AM

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ClearTheCode admin answer: A pulsating or vibrating brake pedal, particularly at higher speeds, is a very common symptom, almost always indicating an issue with your brake rotors.

  1. Primary Causes:

    • Warped Brake Rotors: This is the most frequent cause. Rotors can become 'warped' (more accurately, they develop uneven thickness or hot spots) due to excessive heat from heavy braking, improper installation, or uneven cooling. When the brake pads contact these uneven surfaces, it causes the pulsation felt through the pedal.
    • Runout in Rotors: Even if not 'warped' in the traditional sense, if a rotor has excessive lateral runout (wobbles slightly as it spins), it will cause pulsation.
    • Sticking Caliper Piston/Slide Pins: If a brake caliper piston or its slide pins are sticking, it can cause one pad to drag more than the other, leading to uneven heat distribution and rotor issues, or directly cause a vibration.
    • Wheel Bearing (Less Common for Pedal Vibration): While a worn wheel bearing can cause vibration, it's usually felt more generally through the steering wheel or chassis, and often accompanied by a humming noise, rather than specifically through the brake pedal during braking.

  2. What You Can Do (Initial Check):

    • Visually inspect your brake rotors. Look for any scoring, deep grooves, or discoloration (blue/purple spots can indicate overheating).
    • Feel the surface of the rotor for any noticeable ridges or unevenness.

  3. When to See a Shop:

    • Promptly. While the car still stops, a vibrating brake pedal indicates compromised braking performance and can extend stopping distances.
    • A professional technician can measure the rotor runout and thickness to determine if they are within specification for machining (if possible) or replacement. They will also inspect the brake pads for even wear and ensure the calipers are functioning correctly. Ignoring this issue can lead to premature wear of other brake components and potentially unsafe braking conditions.
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