What you are experiencing is the inability of the clutch hydraulic line to release the pressure.
When driven over long distances, the clutch self applies when pressure builds up due to the heat. The possibilities for such to happen are,
1. Faulty master cylinder.
2. Improperly adjusted pedal push rod to master cylinder clearance or height or faulty pedal return spring.
3. Riding the clutch pedal with the foot.
Monday, November 6th, 2017 AT 3:51 PM