In many car models, the clutch master cylinder uses the brake fluid, so they are using a shared reservoir. Otherwise, you have a problem somewhere in the system, and the most likely culprit is a leaking clutch master cylinder. And if you’re looking in the clutch fluid reservoir, the fluid should always be at the same height. No, we’re not yanking your chain clutch fluid is a real thing. Here is a more detailed list of the signs of a bad or failing clutch master cylinder to look for: 1. Sometimes, it can cause the clutch pedal to stay on the floor. It can also cause a soft or spongy clutch pedal or other issues with the clutch pedal. The most common symptom of a bad clutch master cylinder is a low clutch or brake fluid level due to a leak. Clutch Master Cylinder Replacement Cost Symptoms Of A Bad Clutch Master Cylinder