Why is the clutch pedal stiff?

[DiKatherine]

The reasons for a stiff clutch pedal are: 1. Mechanical binding in the clutch operating mechanism; 2. Insufficient hydraulic fluid or leakage in the clutch master cylinder; 3. Corrosion of the clutch slave cylinder; 4. Blocked air passage or air leakage in the clutch booster cylinder; 5. Broken or bent clutch release fork; 6. Detached release bearing or bearing seat. The clutch is located in the flywheel housing between the engine and transmission, with the clutch assembly bolted to the rear plane of the flywheel. The output shaft of the clutch serves as the input shaft of the transmission, functioning to ensure smooth vehicle starting and seamless gear shifting.