Skip the auto shop - Our mechanics make house calls

Q: Brake pedal feels mushy & goes almost to floor.

asked by on

Only leak I can see/find is rt. rear axle inner seal. Can differential oil be getting on brake pads. (rear disc brakes). Don't see any oil on pads or rotor.

My car has 192000 miles.
My car has an automatic transmission.

Liquid (oil, water, grease) contaminants on brake pads do not affect pedal travel, although they might increase stopping distances. Most brakes systems are designed and/or located such that leaks from nearby systems can’t contaminate the pads. At any rate, a quick visual inspection by a mechanic would answer that one way or another. Your excessive brake pedal travel is due to external leaks, air in the system, ballooning rubber hoses that have failed, a clogged proportioning valve, and/or a failed master cylinder that is leaking internally. Check the fluid level in the master cylinder reservoir. If the fluid level is above the minimum, you probably do not have an external leak. Initially, a mechanic would try to expel all air from the brake hydraulic lines and re-test pedal height and also check rubber hoses for failure. Once all air is removed, and external leaks are eliminated as a possibility, if pedal travel is still too great, it is possible the master cylinder is leaking internally. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a low brake pedal inspection and the responding mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.

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
  1. Home
  2. Questions
  3. Brake pedal feels mushy & goes almost to 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: What is proper Volvo brake repair procedure?

When warped brake rotors are replaced, they are generally done as a pair. Anything you do to one side of the vehicle, you should do the same to the other side such as replacing rotors, brake pads or suspension parts....

Q: Oil change place could not do oil change because plug is stripped. What do u recommend?

Hello, If you cannot remove the oil plug then have the oil removed using the dip stick tube with a suction machine. I use this on vehicles on the road and can suck all the oil out through the dipstick...

Q: Fuel pump problem

It could be a fuel pump, or a fuel pump relay issue. The fuel pumps are problematic on these Ram Diesels, and will quit with no warning. There are many aftermarket pumps that are more durable than the stock Dodge...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...