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2018 Grand Cherokee Summit: Spongy Brake Pedal and Longer Stopping Distance

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Sarah K. · rep 0 · May 25, 2:22 AM · 1 replies · solved · Question

Vehicle: 2018 Jeep Grand Cherokee Summit

Hey everyone,

I've got a 2018 Jeep Grand Cherokee Summit, and lately, the brake pedal has felt really soft and spongy. It goes down quite a bit before the brakes really engage, and I feel like I have to press much harder than before to stop.

It's also taking longer to come to a complete stop, which is a bit concerning. I haven't noticed any warning lights on the dash, and the brake fluid level looks okay, but I'm not sure what else to check. Has anyone experienced this with their WK2 Grand Cherokee? What could be causing this?

Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:22 AM

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ClearTheCode admin answer: A spongy brake pedal and increased stopping distance on your 2018 Jeep Grand Cherokee Summit are serious safety concerns that require immediate attention. This usually indicates an issue within the hydraulic braking system.

Here are the common causes and diagnostic steps:

  1. Air in the Brake Lines: The most common cause. Air is compressible, unlike brake fluid, leading to a soft pedal. This can happen after brake work or if the fluid level was allowed to get too low.
  2. Brake Fluid Leak: Check all brake lines, calipers, wheel cylinders (if applicable), and the master cylinder for any signs of fluid leakage. Even a small leak can introduce air or reduce pressure.
  3. Worn Master Cylinder: The master cylinder is responsible for pressurizing the brake fluid. Internal seals can wear out, allowing fluid to bypass, leading to a spongy pedal or even a pedal that slowly sinks to the floor.
  4. Faulty Brake Caliper/Wheel Cylinder: A stuck caliper piston or a leaking wheel cylinder can affect braking performance and pedal feel.
  5. Contaminated Brake Fluid: Old or contaminated brake fluid can boil under extreme conditions, creating air bubbles, though this usually presents under heavy braking.

When to see a shop: Given that this is a critical safety issue affecting your ability to stop the vehicle, we strongly recommend having your Jeep inspected by a qualified mechanic as soon as possible. Do not delay this repair. Driving with compromised brakes is extremely dangerous. A professional can properly diagnose the exact cause, perform a thorough brake system flush and bleed, or replace faulty components like the master cylinder or calipers, ensuring your vehicle is safe to drive.

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