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2020 Altima Brake Pedal Pulsation - Warped Rotors Again?

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

Vehicle: 2020 Nissan Altima SV

Hello fellow Nissan owners,

I'm experiencing a frustrating issue with my 2020 Nissan Altima SV. When I apply the brakes, especially from higher speeds (like 50+ mph), I feel a distinct pulsation or vibration through the brake pedal. It's not as noticeable at lower speeds, but it's definitely there.

I just had the brakes serviced about 10,000 miles ago, and I'm wondering if I'm already dealing with warped rotors again. Is this a common problem with the Altima, or could it be something else? The car has about 45,000 miles on it now.

Any insights would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:54 AM

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ClearTheCode admin answer:

Brake pedal pulsation in your 2020 Nissan Altima SV, particularly at higher speeds, is a classic symptom of an issue with your braking system. While 'warped rotors' is a common term, it's more accurately described as disc thickness variation (DTV) or excessive rotor runout.

Common Causes:

  1. Disc Thickness Variation (DTV) / Rotor Runout: This is the most frequent cause. Over time, uneven wear or improper cooling can cause slight variations in the rotor's thickness or how it spins relative to the hub. When the brake pads clamp down, these variations cause the pedal to pulse.
  2. Improper Bedding-In: If new pads and rotors aren't properly 'bedded-in' (a specific braking procedure), material transfer from the pads to the rotors can be uneven, mimicking DTV.
  3. Stuck Caliper Piston/Slide Pins: If a brake caliper piston or its slide pins are sticking, the pads won't release properly, leading to uneven pad wear, excessive heat, and rotor issues. This can also cause the car to pull to one side.
  4. Loose Wheel Bearings: While less common for pulsation, a failing wheel bearing can introduce play and vibration that might be felt through the braking system.

What to Do:

  • Inspect Rotors: Visually check your rotors for any scoring, grooves, or blue spots (indicating excessive heat).
  • Check Calipers: Ensure calipers are moving freely and not sticking.

When to See a Shop: Brake issues are critical for safety. You should have your Altima inspected by a qualified mechanic as soon as possible. They can measure rotor runout and DTV precisely, inspect your calipers and pads, and determine if resurfacing the rotors, replacing them, or addressing a caliper issue is necessary. Ignoring brake pulsation can lead to reduced braking performance and increased stopping distances.

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