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2017 Ford Fusion SE - Hard Brake Pedal and Reduced Braking Power

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Heather Y. · rep 0 · May 22, 2:30 AM · 1 replies · solved · Question

Vehicle: 2017 Ford Fusion SE

Hello everyone, I'm experiencing a very concerning issue with the brakes on my 2017 Ford Fusion SE. Lately, the brake pedal has become incredibly hard to push, almost like there's no power assist. It takes a lot of effort to slow down the car, and the braking power feels significantly reduced.

This started happening intermittently, but now it's almost constant. I've heard about some brake booster issues or recalls on certain Ford models. Could this be what I'm dealing with? It feels unsafe to drive.

Has anyone else with a Fusion from this generation had a similar problem? What was the diagnosis and fix? I'm worried about safety and want to get this resolved quickly.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:30 AM

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ClearTheCode admin answer:

Your description of a hard brake pedal and reduced braking power is a classic symptom of a failing brake booster or a problem with the vacuum supply to the booster. This is a serious safety concern and requires immediate attention.

  1. Common Causes:

    • Brake Booster Failure: The brake booster uses engine vacuum (or an electric pump in some models) to multiply the force you apply to the brake pedal. If the diaphragm inside the booster fails, or if there's an internal leak, you lose power assist, resulting in a very hard pedal.
    • Vacuum Leak: A leak in the vacuum hose connecting the booster to the engine's intake manifold (or to the vacuum pump on EcoBoost engines) will prevent the booster from functioning correctly.
    • Vacuum Pump Failure (EcoBoost): Many EcoBoost engines use a dedicated electric vacuum pump to supply vacuum to the brake booster, as they don't generate sufficient manifold vacuum. If this pump fails, you'll lose power assist.
    • Check Valve Failure: A check valve in the vacuum line ensures that vacuum is maintained in the booster even when engine vacuum fluctuates. If this valve fails, vacuum can bleed off.

  2. Potential TSBs/Recalls:

    • Ford has indeed issued recalls and extended warranties for brake booster and vacuum pump issues on various models, including some Fusions, particularly those with EcoBoost engines. It's crucial to check if your specific VIN is affected by any open recalls or customer satisfaction programs related to the braking system. For example, some models had a recall (e.g., 19S54) for potential vacuum pump issues.

  3. When to See a Shop:

    • Do not drive your vehicle if you are experiencing a hard brake pedal and reduced braking power. This is a significant safety hazard. Have it towed to a Ford dealership or a reputable repair shop immediately.
    • A technician will diagnose the issue by checking the vacuum supply to the booster, testing the booster itself, and inspecting the vacuum pump (if applicable). They will also scan for any relevant OBD-II codes. While a hard pedal might not always trigger a 'Check Engine' light, specific codes like P050F (Brake Assist Vacuum Sensor Performance) or C0040 (Brake Pedal Position Sensor) could be present if the system is monitoring vacuum levels or pedal input.
    • Prompt repair is essential to restore safe braking performance.
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