Car clutch problems

Most modern cars use fluid to work the clutch, through a master cylinder at the pedal and a slave cylinder at the gearbox. A leak, worn seals or air in the system is the most common reason for a clutch pedal sticking down or going to the floor.

Older cars may use a cable instead of fluid. A cable can stretch, fray or snap. A snapped cable leaves the pedal limp, while a stretched one changes the biting point.

A spring pulls the clutch pedal back up. If it breaks or comes loose, or the pivot gets stiff, the pedal can stay down even when the rest of the clutch is fine.

The clutch plate wears a little every time you pull away. Once it’s worn, the clutch slips, judders or bites very high. Car clutch failure from wear is usually gradual, so catching it early can save you being stranded.

The release bearing and pressure plate let the clutch disengage when you press the pedal. When they wear or fail, you may hear a squeal or rattle, the pedal may feel odd, and in some cases it can stick down.

Many modern diesel cars have a dual-mass flywheel, which can wear along with the clutch. Rattling at idle and juddering when you pull away are common signs. If it’s worn, we may recommend replacing it at the same time as the clutch.

An oil leak from the engine or gearbox can reach the clutch plate and make it slip or judder. The leak needs fixing as well as the clutch.

A clutch pedal stuck down usually means a fluid leak or air in the clutch hydraulics, or a failed master or slave cylinder. A broken return spring, a snapped cable on older cars or a failed release bearing can also cause it. Don’t drive the car. Stop safely and call for help.

Pull over somewhere safe, put the handbrake on and switch off the engine. Don’t try to drive on or force the pedal up. Call for help, and if you’re an AA Member, call roadside assistance. Then book a clutch check so we can find the cause.

It’s not safe to rely on it. If the pedal sticks down, you may not be able to change gear or stop smoothly in traffic. Book a check as soon as you can, and if it sticks while you’re driving, pull over safely and call for assistance.

A clutch that sticks now and then often has air in the hydraulics, worn master or slave cylinder seals, or a stiff pedal pivot. Some of these faults can be worse in cold weather. They usually get worse over time, so book a check before the pedal sticks for good.

Watch for engine revs rising without the car speeding up, a burning smell, a clutch that bites very high, juddering when you pull away, and a pedal that feels spongy or sticks. Clutch failure usually builds gradually, so booking a check at the first sign can stop you being stranded.

Normal wear is the most common cause, as the clutch plate wears a little every time you pull away. Riding the clutch, slipping it on hills and towing heavy loads all speed that up. Hydraulic faults, oil leaks onto the clutch and a worn flywheel can also cause it to fail.

It can be. On many cars the clutch and brakes share the same fluid reservoir. If a clutch leak has lowered the fluid level, it may affect your brakes too. Check the reservoir only when the engine is off, and have it looked at before you drive.

It depends on the fault and your car. Bleeding the hydraulics or replacing a cable or spring is a smaller job, while a full clutch replacement usually means removing the gearbox. We’ll diagnose the problem and give you a price before we start, and nothing goes ahead without your OK.

You can get your clutch checked at any of our AA Car Service Centres in Dublin, Cork, Limerick, Newbridge and Sligo. Enter your Eircode when you book online and we’ll match you to your nearest centre. All our centres are open Monday to Friday, 8am to 5pm.