If you have a hydraulic clutch the pressure is dropping in the hydraulic system while you are driving and not using the clutch. It will be best practice to check to see if the clutch fluid has not dropped low, this may be feed from the brake master cylinder. If it has it indicates a leak in the system check around the system to see if there is any leaks esspecially at the bottom of the gearbox bellhousing, the clutch slave cylinder / concentric slave cylinder or the clutch pedal master cylinder. If there is no fluid loss or no leaks then the fault lies within the clutch slave cylinder / concentric slave cylinder or the clutch pedal master cylinder which will need to be pressure tested to diagnosis which is at fault. If it is the concentric slave cylinder the gearbox will have to come of so have the clutch changed at the same time.
arizona kid, June 2011
