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2017 Mazda6 Touring: Soft/Spongy Brake Pedal Feel

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Mike T. · rep 0 · May 22, 4:49 AM · 1 replies · solved · Question

Vehicle: 2017 Mazda6 Touring

Hey everyone, I'm having an issue with my 2017 Mazda6 Touring, which has about 70,000 miles. Recently, the brake pedal has started to feel really soft and spongy. It doesn't feel firm like it used to, and I have to push it down further to get the same braking power. It almost feels like there's air in the lines.

I haven't noticed any warning lights on the dash, and the car still stops, but it definitely takes more effort and the pedal travel is increased. I haven't had any brake work done recently. What could be causing this soft pedal feel? Is this something I can bleed myself, or should I take it in immediately?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:49 AM

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ClearTheCode admin answer:

A soft or spongy brake pedal is a serious concern as it directly impacts your vehicle's ability to stop safely. Here are the most common reasons for this symptom in your 2017 Mazda6:

  1. Air in the Brake Lines: This is the most frequent cause of a spongy pedal. Air is compressible, unlike brake fluid, so when you press the pedal, you're compressing air before the hydraulic pressure can effectively engage the brakes. This can happen after brake work if not bled properly, or if fluid levels drop too low.
  2. Low Brake Fluid Level: If the brake fluid reservoir is low, air can be drawn into the system. Check your fluid level immediately. A low level often indicates a leak somewhere in the system.
  3. Brake Fluid Leak: A leak in a brake line, caliper, wheel cylinder, or master cylinder will cause a loss of pressure and a soft pedal. Visually inspect all brake components for signs of fluid leakage.
  4. Failing Master Cylinder: The master cylinder is responsible for generating hydraulic pressure. If its internal seals are worn, fluid can bypass them, leading to a soft or sinking pedal. This is a more serious issue.
  5. Faulty ABS Modulator: While less common, a problem with the ABS (Anti-lock Braking System) modulator can sometimes cause a spongy pedal. If this were the case, you might also see an ABS warning light or related C-codes (Chassis codes) when scanned with an advanced OBD-II tool.

When to See a Shop:

  • Immediate Action Required: Do not drive the vehicle extensively with a soft brake pedal. Your braking performance is compromised, posing a significant safety risk.
  • Professional Diagnosis: While you can check the fluid level, diagnosing and fixing leaks, bleeding the system correctly (especially if ABS is involved), or replacing a master cylinder requires professional expertise and specialized tools. Incorrect bleeding can leave air in the system.
  • Safety Critical: Any issue with the braking system is critical. Have a certified mechanic inspect your Mazda6 as soon as possible.
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