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How to bleed brakes
For the 240sx, you must bleed in a specific order to eliminate air from the lines. It's really easy to remember what the order is, too.. Simply start at the point furthest from the master cylinder and work your way in. In most cars, this means starting at the side furthest from the driver.
In USDM S-chassis, since the brake hardlines run along the passenger side framerail that makes the driverside rear brake the furthest from the master cylinder.
That means:
DRIVER REAR
PASS REAR
PASS FRONT
DRIVER FRONT
There are a few ways to do this:
1.) using a source of vacuum on the bleeder and sucking the fluid through.
2.) having a partner pump the brakes for you. Basically, your partner builds pressure in the system, and when you release that pressure, you force out old fluid and air. Make sure your partner holds the pedal down when you're releasing, and lets you know when the pedal has sunk.
3.) submerging a tube going from your bleeder into a container of old brake fluid. Just keep pumping the brakes. The new fluid will be sucked into the master cylinder more easily than the old fluid can be sucked back in.
In all of these methods, you must ensure that your brake master cylinder does not run out of brake fluid. Otherwise, you've negated everything you've done by allowing air into the lines.
Once you're finished bleeding, pump the brakes until they're stiff before turning the car on. This insures proper pedal feel.
Good luck!
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