The amount of free play, or the amount of travel distance of the clutch pedal before resistance is felt, may need to be adjusted during the life of the clutch. If there is not enough free play in a hydraulic clutch then the fluid cannot properly return to the master cylinder. This will in turn cause the fluid to expand and the clutch will not be able to engage fully. This condition will be noticed by the driver as a higher engagement point in the clutch pedal as the clutch warms up. Adjusting the amount of free play in the clutch will affect the height of the clutch pedal itself.