How to Bleed a GM Clutch Master Cylinder

by Cassandra Tribe

You will need to bleed your GM clutch master cylinder anytime the clutch is not working as effectively as it should or if the fluid in the top fluid reservoir appears dark or dirty. It is important that you bleed the master cylinder without introducing air into the system. It's a surprisingly simple process, but you may have to repeat it a few times to get the job done right.

Open the hood of your car and locate the clutch master cylinder, which is mounted on the firewall of your car, near the position of your clutch pedal on the driver's side. It will have a plastic fluid reservoir on top.

Remove the cap from the clutch master cylinder fluid reservoir by pressing down and turning it counterclockwise until the small tangs sticking out of the cap line up with the gaps in the rim of the reservoir.

No matter the style of your GM cylinder, the turkey baster will do the trick.

Using a turkey baster, remove some but not all of the clutch fluid in the reservoir. Leave enough to cover the feed hole to the clutch line, which you will be able to see easily by looking down into the reservoir. Empty the fluid you have removed into a clean jar.

Add new clutch fluid up to the fill line in the reservoir. Replace the cap.

Pump the clutch four or five times to send the clutch fluid through the system. Remove the reservoir cap and look at the fluid. If it is still very dark or cloudy or has particles floating in it, repeat these steps until the fluid is clear. Bring your jar of used clutch fluid to your local mechanic to dispose of properly.


  • check Place your bottle of new clutch fluid on a flat surface in an area where it will not be disturbed or moved for 24 hours before you bleed the GM master clutch cylinder. This will prevent air bubbles from forming in the fluid in the bottle, which could be passed into your system.


  • close Do not remove all of the fluid from the reservoir or attempt to bleed the master clutch cylinder by removing the feed hose, as this will allow air to enter your clutch system and cause it to fail while you are driving.

Items you will need


About the Author

Cassandra Tribe has worked in the construction field for over 17 years and has experience in a variety of mechanical, scientific, automotive and mathematical forms. She has been writing and editing for over 10 years. Her areas of interest include culture and society, automotive, computers, business, the Internet, science and structural engineering and implementation.

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