Q: Brake fluid replaced, now car will not stop unless brake pedal is nearly to the floor.

asked by on

I had the brake fluid replaced by recommendation of my Honda service department (after a state inspection). I left with the car and nearly had to push the brake pedal all the way to the floor to get the car to stop. Still drove the car home. Called when I got home and left a message for my service representative (past service department hours). Spoke to someone else the next morning who said do not drive the car (safety issue) and have it towed to the dealership. Now I have to have the master cylinder replaced. What happened here? Is this a result of the service performed? Should I expect them to pay for this, or should I?

One of the most common causes of the brake pedal going to the floor is a loss of brake fluid. Generally, this is easy to detect due to the fact that there is usually brake fluid leaking on the ground underneath the vehicle. The brake booster is a mechanism that uses vacuum pressure to take the force being applied to the brake pedal and amplify it. If the booster is bad, then the full amount of force needed to activate the master cylinder and pressurize the brake fluid isn’t going to be there. The pedal will go all the way to the floor and the car will be harder to stop.

Another possible cause for this may be a failing master cylinder. The master cylinder is where the brake fluid is compressed creating the necessary hydraulic pressure the braking system needs in order for it to stop your vehicle. When the master cylinder fails, this may cause a loss of hydraulic pressure which will usually also cause the brake pedal to go to the floor. I would recommend having an expert from YourMechanic come to your location to diagnose your braking system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Brake fluid replaced, now car will not stop unless brake pedal is nearly to the floor.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I have a creaking/squeaking noise when turning the steering wheel

If an assistant, preferably a mechanic, listens at the relevant suspension and steering components under the vehicle as you turn the steering wheel the sound can undoubtedly be pinpointed. Be sure to check at the top of the spring tower...

Q: How quickly should I take my car to the shop? It says service ecm. How much does this usually cost?

Hello, thank you for writing in. While there is typically not a designated warning light for the ECM (electronic control module), there may be a check engine light pertaining to it. If you pulled a code for the ECM, further...

Q: Parking Brake suddenly appears on the dashboard while driving

Check if your brake fluid level is full in the brake master cylinder. The light comes on when you fluid gets low enough to turn on the light and as you drive it, the fluid gets hot and expands and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.