Signs your clutch needs replacing

A clutch rarely fails without hinting first. The friction material on the driven plate wears down a little with every gear change, and as it thins, the way the pedal feels and the way the car pulls away both change.

The trick is noticing those changes early. Below are the signs we would take seriously, what each one usually points to, and when it stops being something you can live with.

Does the engine rev but the car barely speeds up?

This is the textbook sign of a slipping clutch. You press the accelerator, the revs climb, but the car responds late or not at all, particularly in a higher gear or when climbing a hill or pulling a load.

It happens because the driven plate no longer grips the flywheel firmly enough to carry the engine's power. Oil contamination from a leaking seal can cause the same symptom, so a slipping clutch is not always just old age. Either way it needs inspecting, because slip generates heat and speeds up the damage.

Has the biting point moved?

As the friction lining wears, the point where the clutch starts to take up drive tends to creep higher up the pedal travel. If you now only feel it engage when your foot is almost off the pedal, wear is a likely cause.

A biting point that suddenly shifts, or a pedal that feels spongy, may instead point to the hydraulic system or a cable that has stretched. Those are different repairs, which is why a proper diagnosis matters before parts are ordered.

What do judder, noises and smells mean?

Several other symptoms are worth listing, because drivers often describe them in different ways:

• Judder or shaking when pulling away from rest
• A burning smell after hill starts or heavy traffic
• A grinding or rattling noise when the pedal is pressed
• Squealing or whirring that changes when the pedal moves
• A heavy or uneven pedal feel

Why is it hard to select gears?

If the car crunches when going into gear, or reverse and first are awkward to find when stationary, the clutch may not be fully releasing. This is called dragging, and it can come from worn components, a hydraulic fault or air in the system.

A clutch that will not select gears at all is a safety issue. Do not keep driving. Pull over somewhere safe, and arrange for the vehicle to be looked at before it is moved any further than necessary.

How long can you carry on driving with a worn clutch?

There is no reliable answer, because it depends on the vehicle, how it is driven and how far the wear has gone. A clutch that is slipping slightly may last a while, or it may go suddenly under load, such as on a steep Cornish hill with a full car.

Delaying often makes the job larger. A slipping clutch can overheat the flywheel surface, and a flywheel that is scored or damaged needs replacing as well, which raises the overall cost of the work. Early attention usually keeps the repair simpler.