Q: Spongy clutch: inconsistent

asked by on

Hello, my clutch free play is constantly changing. If you consider an untouched clutch pedal at 0 and the pedal depressed completely to the floor as 100, 0-50 does nothing (spring not activated whatsoever). 50-100 is where the entire clutch/shifting gears operation occurs. Sometimes it only works from 75-100 but I am always able to shift with no problems. Sometimes when I go over a bump, the clutch will start working normally (free play from 0-100). It only operates in this way (correctly) about 10% of the time. I have not noticed any correlation between the outdoor temperature, engine temperature, or anything else that could cause this. I believe it could have something to do with the hydraulic clutch fluid being dirty or having air in the lines. Other people have said perhaps the slave cylinder (has an internal slave cylinder)? Someone else said the throw out bearing but there is no grinding or other adverse noises when driving or using the clutch. What do you think?

My car has 176000 miles.
My car has a manual transmission.

Hi. I think you have a problem with the clutch master cylinder having an intermittent problem. The clutch master cylinder is just like a brake master cylinder and the O rings in the cylinder go bad causing air to get in the system giving a spongy pedal. If the O rings are leaking a little they tend to make intermittent problems in the system. I think that some of these trucks had internal slave cylinders and others had external ones. If the slave cylinder is leaking then it would cause this problem otherwise it would cause the transmission to be hard to be put in gear. If you need assistance, a certified YourMechanic technician can come to your location to help adjust the clutch on your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Spongy clutch: inconsistent

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: will the radiator and clutch from a 00 coupe fit my 03

Unfortunately, without knowing the specific model of your Hyundai and the motor it came with, there is no way to tell if the radiator and clutch may be interchangeable.

Q: Vibrating when driven

Greetings. It could very well be the propeller shaft but there are other suspension parts that will cause similar driving concerns. Ball joints and wheel bearings being two of such parts. However, the 2000 Explorer's will usually experience a shake...

Q: Engine takes to long to warm up I've replaced thermostat already and it misses horrible till it warms up its a 4.9 engine

These engines are known to get real bad carbon build up on the back sides of the valves. If you engine has a hard time getting to operating temperature then it will also cause the engine to carbon up even...

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...
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...
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...