Skip the auto shop - Our mechanics make house calls

Q: Brake pedal goes all the way to the floor

asked by on

After I had the rear wheel cylinder replaced on the left rear wheel, the brake pedal still goes all the way to the floor

A sinking pedal is often a sign that there is a leak somewhere in the brake’s hydraulic system. Sometimes a problem of this nature may render a vehicle unsafe to drive, as braking systems relies on sealed pressure to operate. I would thoroughly inspect all 4 wheels, and underneath the vehicle for any obvious signs of leakage. If no obvious visual evidence is found, I would then suspect a problem with the master cylinder. Master cylinders usually fail due to internal sealing issues, so a thorough diagnosis of your braking issue by a mechanic would be recommended.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Clutch slipping started recently

Hi there. The Mini tends to wear through the clutch very quickly. Many other Mini owners with manual transmissions have reported having to replace the clutch at very low mileage, sometimes under 10k miles. The clutch will most likely need...

Q: Should I leave the same inner and outer race that came on my new rotors and not replacing it with the new ones that came with my n

If you have a new rotor with new races already installed then there is no need to change them out.

Q: no power from coil to distributor

The ignition module on the fender should be looked at to see if it has ever been replaced. These modules on the fender go bad all the time. Try to disconnect and reconnect the connection to the module. Test...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...