Skip the auto shop - Our mechanics make house calls

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 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・Fair and transparent pricing

Get a quote

What others are asking

Q: Low clutch pedal and internal leak inside the car. What needs to be fixed and what's the price normally

Hi there. If you have a fluid leak inside the car then replace the clutch master cylinder if it is the leak, and then bleed system. Make sure to check the clutch slave cylinder for leaks also. A certified professional...

Q: Burning oil

There are a number of reasons that the truck could be burning oil, the one most likely to make it burn oil while driving would be a failed oil control ring on one of the pistons, and the second most...

Q: Calipers seem to stick

The brake caliper slides may be in need of being cleaned and lubed. This should be done at every brake pad change. It is not always done when the brakes are replaced. This would be the first thing I would...

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...
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...