Diagnosing Clutch Faults (BMW 5 Series E28)

Symptom	Possible cause
The clutch pedal drops to the floor with little or no resistance	The master or slave cylinder is faulty (see chapter Clutch).
	There are hydraulic fluid leaks in the lines (see chapter Clutch).
	The tightness of the hydraulic circuit fittings is broken (see chapter Clutch).
	The hydraulic fluid in the reservoir has run out (see chapter Routine car maintenance).
	If there are traces of fluid in the master cylinder boot, the rear seal of the master cylinder is damaged (see chapter Clutch).
	The release bearing or clutch release fork is damaged (see chapter Clutch).
There are traces of hydraulic fluid on the master cylinder boot cover and in the clutch pedal area	The rear seal of the master cylinder is damaged (see chapter Clutch).
Traces of fluid are present on the actuator cylinder	The plunger seal of the actuator cylinder is damaged (see chapter Clutch).
When pressing the clutch pedal, there is a feeling of softness of movement	Air has entered the hydraulic system (see chapter Clutch).
Clutch does not disengage (unable to select gear)	The transmission is faulty (see chapter Manual transmission (MT)).
	The clutch disc is faulty (see chapter Clutch).
	The release bearing and clutch release fork are not assembled correctly (see chapter Clutch).
	The clutch pressure plate is faulty (see chapter Clutch).
	The bolts securing the clutch basket to the flywheel have become loose (see chapter Clutch).
The clutch is slipping (engine speed increases without increasing vehicle speed)	The friction linings of the driven disk are excessively worn (see chapter Clutch).
	The friction linings of the driven disk are contaminated with oil due to leaks through the rear crankshaft oil seal (see chapter Clutch).
	The diaphragm spring is weak (see chapter Clutch).
	The driven clutch disc is overheated (see chapter Clutch).
Vibration occurs when the clutch is engaged	The friction linings of the driven disk are contaminated with oil or grease, polished to a shine or burnt (see chapter Clutch).
	The power unit mounts are worn out or their fastening has become loose (see Chapters Engine and Manual transmission (MT)).
	The splines of the gearbox input shaft or the driven disk hub are worn (see chapter Clutch).
	The pressure plate or flywheel is deformed (see chapter Clutch).
Extraneous noises occur in the clutch area	The clutch release fork is not installed correctly (see chapter Clutch e).
Extraneous noises occur in the clutch area	The clutch release bearing is faulty (see chapter Clutch).
The clutch pedal remains pressed to the floor after release	The clutch release fork is jammed in the housing (see chapter Clutch).
	The release bearing or clutch release fork is broken (see chapter Clutch).
The clutch pedal requires too much force to depress	The clutch release fork is jammed in the housing (see chapter Clutch).
	The pressure plate is faulty (see chapter Clutch).
	The master or slave cylinders of the clutch are not of the correct size (see chapter Clutch).

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Article verified: Zhuravleva Isolda

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БМВ E28: Clutch

Removal, inspection and installation of clutch components
Bleeding the hydraulic clutch system
Removal and installation the clutch slave cylinder
Checking the operation and replacing the clutch switch (where…
Adjusting the clutch pedal

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