Checking And Removing A Clutch Master Cylinder | How A Car Works

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If a clutch fails to disengage fully when the pedal is pressed, the problem may be the clutch itself. In a hydraulic clutch, however, the problem may lie in the master or slave hydraulic cylinders .

Worn or ill-fitting seals may allow hydraulic fluid to leak past the piston in either cylinder, so that the slave piston does not travel far enough to disengage the clutch.

Any sort of leak will have the same effect and air might get into the system.

If the system has air in it, the action of the pedal may feel 'spongy', whereas with other faults the pedal may feel normal, although the clutch does not work properly.

If seals are worn or damaged, fit a service kit which includes new seals.

The cylinder bores may have worn or become rough — hydraulic fluid is hygroscopic , absorbing moisture from the atmosphere, which can cause corrosion in the bores.

In this case, fitting a new cylinder is the only remedy. Trying to smooth the bore with abrasives only makes it worse, and the roughness quickly wears out new seals.

Lack of fluid is easily fixed by topping up the master-cylinder reservoir , but you still have to find out why the fluid level was low. There should be virtually no loss in normal use.

Remove air from the system by bleeding it (See Bleeding a clutch ). Check the entire system and repair any leaks.

If you replace either a master or a slave cylinder , buy one of the same manufacture, and be absolutely sure you get the right model or an approved successor.

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