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2020 Pacifica - Soft Brake Pedal, Sometimes Goes to Floor

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Sarah K. · rep 0 · May 22, 5:52 AM · 1 replies · solved · Question

Vehicle: 2020 Chrysler Pacifica Touring L

Hey everyone,

I'm having a really concerning issue with my 2020 Chrysler Pacifica Touring L. Lately, the brake pedal has felt really soft, almost spongy. It doesn't always happen, but sometimes when I press the pedal, it just goes almost all the way to the floor before the brakes really engage. It's making me nervous, especially in traffic.

I haven't noticed any warning lights on the dash, like for the ABS or brake system, and the brake fluid reservoir looks full. I had the brake pads and rotors replaced about 10,000 miles ago, but this issue just started a few weeks ago. There are no visible leaks around the wheels or under the hood.

Has anyone experienced this with their Pacifica or another Chrysler model? What could be causing this? I'm trying to figure out if it's something I can check myself or if I need to take it straight to the dealer. Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:52 AM

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ClearTheCode admin answer:

A soft or spongy brake pedal that sometimes goes to the floor is a serious safety concern and should be addressed immediately. While you haven't seen warning lights, the issue points to a problem within the hydraulic brake system. Here's a breakdown of potential causes and steps:

  1. Check Brake Fluid Condition and Level: Even if the reservoir looks full, the fluid might be old or contaminated. Brake fluid absorbs moisture over time, which can lower its boiling point and lead to a spongy pedal, especially under heavy braking. Ensure the fluid is at the MAX line and looks clear, not dark or murky.

  2. Air in the Brake Lines: This is one of the most common causes of a soft pedal. Air is compressible, unlike brake fluid, so it can cause the pedal to feel spongy. Air can enter the system after brake service (if not bled properly), or if a component was replaced. A thorough brake bleed, starting from the wheel furthest from the master cylinder, is often necessary.

  3. Master Cylinder Failure: The master cylinder is responsible for converting pedal pressure into hydraulic pressure. If the internal seals are worn, fluid can bypass them, leading to a loss of pressure and the pedal sinking to the floor. This often worsens over time. A failing master cylinder typically doesn't show external leaks initially.

  4. Brake Booster Issues: While less common for a soft pedal (a failing booster usually causes a hard pedal), a vacuum leak in the booster or its hose could potentially affect pedal feel. However, a soft pedal going to the floor is more indicative of a hydraulic problem.

  5. ABS Module Malfunction: In rare cases, an internal issue with the ABS hydraulic control unit could cause fluid bypass or pressure loss. If you notice any ABS or traction control warning lights, or if the problem is intermittent and seems to reset, the ABS module might be a suspect. However, this usually triggers a diagnostic trouble code (DTC).

When to See a Shop:

Given the safety implications, it's highly recommended to have your Pacifica inspected by a qualified mechanic as soon as possible. Do not delay this repair. While you can check the fluid level, diagnosing and repairing issues like air in the lines, a failing master cylinder, or an ABS module requires specialized tools and expertise. A mechanic can perform a proper brake system inspection, pressure test, and bleeding procedure. They can also check for any stored (even if not active) OBD-II codes related to the brake system, especially in the ABS module, which might not illuminate a dashboard light but could provide valuable diagnostic information.

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