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C5 Allroad (1999-2005) C5 (1997-2004) C4 (1994-1997)

Bleeding the hydraulic clutch drive (Audi A6 C5)

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  • Audi A6
  • C5 (1997-2004)
  • Transmission
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  • Bleeding the hydraulic clutch drive
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Bleeding the hydraulic clutch system is necessary if the clutch does not disengage when shifting gears, the clutch pedal travel is impaired, or system components are disconnected. When bleeding, add only clean fluid of the required type. Never reuse fluid that has been used in the hydraulic clutch system.

Attention
  • The brake fluid used in the hydraulic clutch system is poisonous, so if it gets on your skin, you should immediately wash the area with plenty of water. If the fluid gets into your eyes, you should immediately consult a doctor.
  • Brake fluid dissolves paint and plastic, so if the fluid gets on your car's paintwork, rinse it with plenty of water.
  • Brake fluid is hygroscopic, that is, it absorbs moisture from the air, and therefore it is not recommended to use fluid stored for a long time in an open container.
  • If brake fluid gets on the gearbox housing (especially made of magnesium alloy), flush the crankcase immediately.


If different types of fluids have been mixed in the hydraulic system, remove the fluid from the hydraulic system, flush the system with clean fluid of the correct type, and install new O-rings.

If fluid leaks from the hydraulic system are persistent, determine the cause and location of the leak and repair the damage.

Place the vehicle over an inspection pit or lift it on a lift.

Remove the lower engine compartment splash shield.

Check that the hydraulic tube and clutch hose connections are securely tightened and that the bleeder screw on the rear of the clutch slave cylinder is screwed in. Remove the dust caps from the bleeder screws of the clutch slave cylinder and the front left brake caliper and clean them of dirt.



Attach a clear hose to the bleed nipple of the left front brake caliper.

Fill the hose with brake fluid. To do this, press the brake pedal and unscrew the bleed nipple half a turn while pressing the pedal. Continuing to press the pedal, force the fluid in the system into the transparent hose. After the pedal reaches the extreme forward position and the fluid stops flowing into the hose, screw in the bleed nipple. Repeat these operations until the hose is filled with brake fluid. Support the transparent hose to prevent brake fluid from spilling out.

When performing this operation, do not allow the brake fluid level to fall below the MIN mark on the replenishment reservoir.

Place the other free end of the transparent hose on the bleed nipple of the clutch slave cylinder and unscrew both bleed nipples by half a turn.

Press the brake pedal and, while holding the pedal down, screw the bleeder screw onto the brake caliper. Repeat this operation until no more air bubbles appear in the brake system reservoir. Add fresh brake fluid if necessary.

Screw on the bleed nipples and remove the transparent hose from them.

Wipe the bleed nipples and install protective caps on them.

Check the clutch pedal travel. If the clutch pedal moves unevenly when pressed, there is air in the clutch hydraulic system. If repeated bleeding does not provide a smooth pedal travel, the clutch master or slave cylinder O-rings are worn.

Install the lower engine bay splash shield and lower the vehicle.
The article was checked by auto expert Alexey Ivanov
This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian

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Audi A6 C5: Clutch
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Clutch drive disc
General information
Removal air by pumping under pressure
Main clutch faults


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Clutch hydraulic system — bleeding Audi 80 B3 (1986-1991, petrol)
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