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2020 Acadia Denali Soft Brake Pedal and Grinding Noise

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Mike T. · rep 0 · May 25, 2:38 AM · 1 replies · solved · Question

Vehicle: 2020 GMC Acadia Denali

I'm having some concerning brake issues with my 2020 GMC Acadia Denali. The brake pedal feels much softer than it used to, and I have to push it down further to get the car to stop. On top of that, there's a noticeable grinding noise when I apply the brakes, especially at lower speeds. It's not a constant sound, but definitely happens every time I brake.

The car has around 55,000 miles. Could this be air in the lines, or something more serious? I'm worried about safety.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:38 AM

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A soft brake pedal combined with a grinding noise in your 2020 GMC Acadia Denali at 55,000 miles is a serious safety concern that requires immediate attention. Here are the most likely causes:

  1. Severely Worn Brake Pads: The grinding noise is a classic symptom of brake pads that have worn down past the friction material, causing the metal backing plate to rub against the rotor. This significantly reduces braking effectiveness.
  2. Damaged Rotors: If the pads have been grinding, the rotors are likely damaged, grooved, or scored, which will worsen braking performance and noise.
  3. Air in the Brake Lines: A soft, spongy pedal often indicates air in the hydraulic system. This can happen after a brake component replacement, or if a brake line has developed a leak, allowing air to enter and fluid to escape.
  4. Brake Fluid Leak: Check your brake fluid reservoir. If it's low, you likely have a leak somewhere in the system (caliper, line, master cylinder).
  5. Master Cylinder Failure: Less common, but a failing master cylinder can also lead to a soft pedal as it struggles to maintain hydraulic pressure.

When to see a shop: Do not delay in getting your vehicle inspected by a qualified mechanic. Brake issues are critical for safety. You should:

  • Check your brake fluid level immediately. If it's low, do not drive the vehicle.
  • Have the vehicle towed to a reputable service center.

While grinding brakes typically don't trigger OBD-II codes directly, a severe fluid leak or master cylinder issue could potentially lead to ABS or Traction Control system warnings (e.g., codes like C0200 for ABS pump motor issues or C0225 for a brake pressure sensor fault if the system detects abnormal pressure). However, the primary concern here is mechanical failure and loss of braking power.

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