1995 z32 TT
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"Bench bleeding" gets the air out the brake master cylinder (BMC) before installing it.  The brakes have to be bled afterwards regardless, but the idea is to not introduce any extra air into the brake lines during the BMC install. 

Many auto parts stores will give you free brake bleed tubes and adapters, especially if you're buying a rebuilt master cylinder.  The tubes are easy enough to fab and worth the trouble.  Buy a few feet of some clear plastic 3/16" tubing from your neighbor home supply store.   You will need some sort of nipple adapters such that the tubing will temporarily fit and seal into the brake line attachment points on the brake master cylinder and curve back up and around into the mouth of the BMC reservoir.

For street use, the "Super Blue" brake fluid may be overkill, if there is such a thing as overkill when it comes to brakes.  I was getting ready to take my car to WGI.


By depressing the BMC piston with with a 3/8" drive socket extension, the brake fluid is drawn up into the clear tubes and back into the reservoir. 

This takes a little force and an extra pair of hands, or a bench vise.

Any air bubbles rise to the top of the reservoir and are released to the atmosphere.  This avoids introducing any extra air into the brake lines during reinstallation of the BMC. 

Done with the bench bleed.  There isn't any air in the clear plastic tubing and the BMC is full of fluid.  The socket extension is withdrawn. 

After the bench bleed, plastic plugs go where the tubing was attached.  This keeps the brake fluid from draining out during installation of the BMC. 

Also, put the BMC cap back on during installation, duh.  

Bleeding points for the ABS are located under the trim panel behind the passenger seat. Plastic tubing comes in handy here, too, unless you want brake fluid running down inside your car.