An internal clutch Master Cylinder leak will cause what condition?

• A. Clutch slipping
• B. Clutch self-engagement
• C. No engagement
• D. Stiff pedal

Answer: (B)

The condition being tested is how an internal leak in the clutch master cylinder alters hydraulic behavior. When the master cylinder has an internal leak, some fluid can bypass the piston seals and flow within the master itself rather than being properly directed to the slave cylinder. That leakage prevents the hydraulic system from building and holding the correct pressure to fully release the clutch when you press the pedal. As a result, the clutch can end up engaging on its own or remaining engaged even if you’re trying to disengage it, which is described as self-engagement.

Clutch slipping would point to worn friction material or contamination, not specifically a master-cylinder leak. No engagement would imply a loss of hydraulic pressure to the slave, not the unintended engagement described here. A stiff pedal usually indicates mechanical binding, air in the lines, or a faulty master/slave mechanism, rather than an internal seal leak producing self-engagement.