Problems requiring professional attention include:
* Low clutch fluid: Check the reservoir and top it up with the correct type of DOT-rated brake fluid (check your owner's manual). If it's constantly low, there's a leak somewhere in the system.
* Air in the hydraulic lines: Air in the system will cause a spongy or ineffective clutch pedal. This requires bleeding the clutch system. This is a more involved process than just topping up fluid and is best left to a mechanic unless you're experienced with this type of repair.
* Worn clutch master cylinder: A failing master cylinder will often result in a spongy or low pedal.
* Worn clutch slave cylinder: A failing slave cylinder can lead to a complete loss of clutch function.
* Worn clutch plate/pressure plate: These are wear items and will eventually need replacing. A worn clutch will often slip under load.
* Leak in the hydraulic system: This could be anywhere from the master cylinder to the slave cylinder and its connections.
In short: If your Fiesta's clutch isn't working properly, don't attempt to "adjust" it. Take it to a qualified mechanic for diagnosis and repair. Trying to force an adjustment where one isn't possible could damage the system further.
