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2016 S60 T5 - Brake Pedal Pulsation at Highway Speeds

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Mike T. · rep 0 · May 25, 3:54 AM · 1 replies · solved · Question

Vehicle: 2016 Volvo S60 T5 Inscription

Hi everyone,

I've been noticing a really annoying issue with my 2016 Volvo S60 T5 Inscription. When I'm driving on the highway, especially at speeds above 50-60 mph, and I apply the brakes, I feel a strong pulsation through the brake pedal. It's also accompanied by a vibration in the steering wheel.

It's not constant, but happens almost every time I brake from higher speeds. It's less noticeable at lower city speeds. The car has about 75,000 miles on it, and I'm not sure when the brakes were last serviced before I bought it a year ago.

Could this be warped rotors, or something else? I'm trying to figure out if it's something I can check myself or if it's definitely a shop visit. Any thoughts or similar experiences with your S60s?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:54 AM

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ClearTheCode admin answer:

Brake pedal pulsation and steering wheel vibration at highway speeds during braking are classic symptoms of issues within your braking system. While often attributed to 'warped rotors,' the reality is usually more nuanced.

Common Causes:

  1. Rotor Thickness Variation (Runout): This is the most common cause. Rotors don't typically warp from heat; instead, uneven transfer of brake pad material or minor imperfections in manufacturing can lead to variations in rotor thickness or surface flatness. When the caliper squeezes this uneven surface, it causes the pulsation.
  2. Sticking Caliper Piston/Slide Pins: If a caliper piston or its slide pins are seized or sticky, the brake pad might not release properly or apply uneven pressure. This can lead to localized overheating and uneven wear on the rotor, causing pulsation.
  3. Wheel Bearing Issues: A worn or damaged wheel bearing can introduce excessive play in the wheel, which can manifest as vibration during braking, as the rotor is no longer perfectly stable.
  4. Suspension Components: Worn ball joints, tie rod ends, or control arm bushings can sometimes exacerbate brake vibrations or contribute to steering wheel shake.
  5. Improper Installation: If rotors or pads were installed incorrectly (e.g., not cleaning the hub surface thoroughly), it can cause runout.

What to Check/Do:

  1. Visual Inspection: Look at your brake rotors for any deep grooves, discoloration, or obvious signs of uneven wear. Check the brake pads for even wear across the pad surface.
  2. Wheel Play: Jack up the front of the car and try to wiggle the wheel at 12 and 6 o'clock, then 3 and 9 o'clock. Any significant play could indicate a wheel bearing or steering component issue.

When to See a Shop:

Given the symptoms and your car's mileage, it's highly advisable to have your S60 inspected by a professional mechanic. They can accurately measure rotor runout, check caliper function, inspect wheel bearings, and assess other suspension components. Addressing this promptly is important not just for comfort but for braking performance and safety.

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