Signs your clutch is going: slipping, judder, high bite point and smells.

A manual clutch rarely fails without warning. It tends to change gradually: the pedal feels different, the car starts to behave oddly when you pull away, or there is a smell you cannot place. Most of us put it off because the car still drives. This guide covers the common signs of a clutch on its way out, what each usually points to, and when it is worth booking the car in.

Slipping: revs rise, speed does not

Slipping is the classic symptom. You accelerate, particularly in a higher gear or uphill, and the engine revs climb without the car gaining speed to match. The tacho needle rushes up while the speedometer lags behind.

It happens when the friction material on the clutch plate is worn or contaminated and can no longer hold the drive from the engine under load. It usually shows up first in a high gear at low speed, or when towing or climbing, and then gets steadily easier to provoke. Once it happens in ordinary driving, the clutch is close to the end of its life.

Please do not test for slip repeatedly. Every time it slips it generates heat, and heat is what finishes a clutch off.

A high bite point

When the pedal is released, there is a point where the clutch starts to take up the drive, often called the bite point. As the friction material wears, that point tends to creep towards the top of the pedal travel, so the clutch only engages when your foot is nearly off the pedal.

On its own that is a mild sign, but it is a useful one if you notice it moving over weeks or months. A bite point that changes suddenly, or a pedal that feels different from one day to the next, is more often a hydraulic problem than simple wear (see below).

Judder when pulling away

If the car shudders or shakes as you release the clutch from a standstill, something is not engaging smoothly. Common causes include:

• Friction surfaces that are worn, glazed or contaminated (for example by a small oil leak from the engine or gearbox seal).
• A damaged or worn pressure plate or flywheel surface.
• On cars with a dual-mass flywheel, a flywheel that is no longer damping vibration properly. We cover that in our dual-mass flywheel guide.
• Worn engine or gearbox mounts, which can mimic clutch judder.

Judder rarely cures itself. If it is getting worse, get it looked at.

A burning smell

A hot, acrid smell after a hill start, a long crawl in traffic or a slipping clutch is usually the friction material overheating. An occasional whiff after a hard hill start with a heavy load is not alarming. A smell that appears in ordinary driving is.

Trouble selecting gears, or a pedal that feels wrong

If the clutch does not fully release, gears become hard to select, particularly first and reverse, and you may hear a graunch as the gearbox is forced into gear. That points more towards the release side than the clutch plate itself:

• Air or a leak in a hydraulic clutch (on cars that use hydraulics): the pedal feels spongy, sinks to the floor or stays down when pressed.
• A tired master or slave cylinder.
• A stretched or worn cable on cars that use one.
• A worn release bearing, which may whistle or growl when the pedal is pressed or released.

These are different repairs from a worn clutch plate, which is why a proper diagnosis matters before parts are ordered. Sometimes a car needs a hydraulic repair and not a whole clutch; sometimes it needs both. A gearbox fault can also cause hard shifting, so symptoms alone do not settle it.

What shortens a clutch's life

Clutches are consumables, and how long one lasts depends heavily on how the car is driven. The biggest habits to avoid:

• Resting your foot on the pedal. Even a slight press can partly disengage the clutch and wear the release bearing and plate.
• Holding the car on a hill with the clutch. Use the handbrake instead.
• Slipping the clutch to pull away slowly or to manoeuvre more than you need to.
• Towing or carrying heavy loads in a car that is not set up for it.
• Staying in neutral with the clutch pedal down at lights. This keeps the release bearing working for no reason; handbrake and neutral is gentler.

Heavy stop-start town driving wears clutches faster than steady motorway miles, which is just a fact of use rather than anything you have done wrong.

What to do, and when

Think of it in three levels:

• Keep an eye on it: a slightly rising bite point and nothing else.
• Book it in: any slipping, repeated judder, a sticking pedal, or difficulty selecting gears.
• Stop driving it and call: the pedal goes to the floor and will not engage, you cannot select gears at all, or the car will not move when the engine revs.

Driving on a slipping clutch tends to increase the bill. A worn clutch left too long can score the flywheel and damage other components, and a car that fails to engage gear is a safety problem in traffic.

What happens when you bring it in

We would start by listening to what you are feeling and when, then look at the pedal, the hydraulics or cable, and any leaks near the clutch. Clutch cost depends on the car, so we confirm a fixed price in writing before any work starts.

It also helps to tell us what you have noticed and when it started, for example whether it is worse when hot, on hills, or first thing in the morning. That kind of detail often points straight to the cause.

Talk to us

If your clutch is showing any of these signs, our clutch page explains how we work: a fixed price confirmed in writing before any work starts. You can also call us on 07746 922 273.