Skip the auto shop - Our mechanics make house calls

Q: Brake sinks slowly into the floor and have no leaks on master cylinder

asked by on

So when i drive the brake slowly goes down to the floor to the point were im still rolling and the brake doesnt go any further. but when i pump the brake i slowly regain pressure and i have checked all around the master cylinder and there have been no leaks.

My car has 125274 miles.
My car has an automatic transmission.

A: Hello. The master cylinder does not have to...

Hello. The master cylinder does not have to be leaking externally for it to be bad. The pedal sinking to the floor then coming back somewhat when you pump it is generally a tell tale sign that the master cylinder is bad. Have a local expert verify the problem with the brake system and replace the master cylinder if necessary.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Coolant leak pulling left

Thanks for writing in about your 1993 Chevrolet G20. It is most likely a heater core. A coolant pressure test should be performed and the heater core inspected. A white or green residue at the of the coolant hoses at...

Q: power steering not working, hydraulic fluid overflowing

Hello there. A few different faults can cause the power steering fluid to overflow. You are correct that a blockage of some sort could cause the system to overflow. The most likely cause would be either a blocked line, a...

Q: my 93 honda civic screams when i start it. its currently cold outside. what is wrong with it?

The idle is set too high on the high idle linkage or the idle controls. You should have the fast idle adjusted down to specifications. [https://www.yourmechanic.com/services/engine-idle-speed-is-high-inspection] If the idle speed motor is adjusted to specification then the fast idle kick...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...