How the hydraulic clutch system works

If your car's transmission has a hydraulic clutch, chances are you're wondering exactly how it works in your shift system. Most clutches, especially on older cars, work with a gear system that shifts gears as…

If your car's transmission has a hydraulic clutch, chances are you're wondering exactly how it works in your shift system. Most clutches, especially on older cars, work with a gear system that changes gears when you shift. With an automatic transmission, you don't shift at all - the car does it for you.

Basics

Essentially, the clutch works with a shifter or lever. You press the clutch with your foot and that makes the flywheel move. This works with the pressure plate, disengaging the clutch disc and stopping the rotation of the driveshaft. The plate is then released and re-engaged in your chosen gear.

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A hydraulic clutch works on the same basic principle, but differs from its mechanical counterpart in fewer components. This type of clutch has a reservoir of hydraulic fluid, and when you depress the clutch pedal, the fluid becomes pressurized. It works in conjunction with the clutch disc to disengage the gear you're in and engage the new gear.

Service

It is important to be sure that there is always enough liquid. In most cars this is not a problem. It's a closed system, so normally your fluid should last the life of the car and never need to be changed. The exception, of course, is if you are used to driving a very old car. Then wear can lead to leakage and you will need to top up the fluid. You don't have to worry about buying anything out of the ordinary - regular brake fluid will do.

Problems

Your gearshift system is obviously vital to the operation of your vehicle. The hydraulic clutch is what makes the shifting, and if it doesn't work, you'll find yourself riding in one gear—but not for long. You will need to have this checked by a mechanic. To avoid hydraulic clutch issues, it is best to avoid the practice known as "clutch riding". It simply means that you have developed the habit of constantly keeping your foot on the clutch pedal, raising and lowering it to regulate speed. That's what your brakes are for! With proper care, your hydraulic clutch will last a long time.