Common Problems with a Jeep Wrangler (YJ) Clutch Master Cylinder
You normally shouldn't have problems with your Jeep Wrangler (YJ) clutch master cylinder since it's built tough-just like the Wrangler YJ itself. Still, that doesn't mean that it's not going to exhibit problems after tremendous levels of wear. Below are some of the issues that you'll encounter if you have a bad Jeep Wrangler (YJ) clutch master cylinder on hand:
Difficulty in Shifting
This is one of the leading signs of Jeep Wrangler (YJ) clutch master cylinder failure. Naturally, you'll have a hard time in shifting since the clutch master cylinder is responsible for converting non-hydraulic pressure (pressure exerted by your foot on the pedal) to hydraulic pressure. There's no temporary solution to this problem, you'll have to deal with shifting issues until you've replaced your clutch master cylinder.
Stuck Clutch Pedal
If your clutch pedal won't come back up after being pressed, then your Jeep Wrangler (YJ) clutch master cylinder is most definitely busted. This is obviously worse than the condition mentioned above as you won't be able to use your Wrangler YJ at all. The only way that you can drive your Jeep again is if you replace the faulty clutch master cylinder.
Your Jeep Wrangler (YJ) clutch master cylinder may leak if it's cracked, damaged, or if its seal is already worn out. A puddle of fluid can often be found under your Wrangler YJ if that's the case (although keep in mind that the puddle may be a result of other leaking automotive components, too). You can determine this more accurately by closely monitoring the fluid levels. If fluid levels have decreased considerably over the next two days, then there's a very good chance that you indeed have a problematic clutch master cylinder. A replacement of the seal or the clutch master cylinder is necessary in order to put an end to the leaks.
Irregularities in the Reservoir
Another problem caused by a bad Jeep Wrangler (YJ) clutch master cylinder is the abnormal rise of fluid in the reservoir when the clutch pedal is pressed. Since this is very easy to identify and is a surefire indicator of a busted clutch master cylinder, the reservoir should be one of the first things that you should take a look at.