TwinTurbo.NET: Nissan 300ZX forum - On your questions: You might still get some air in the
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Subject On your questions: You might still get some air in the
     
Posted by jzack on January 23, 2014 at 6:53 PM
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In Reply To brake master cylinder, need confirmation please >> posted by stockplayerz(nyc) on January 23, 2014 at 02:37 PM
     
Message system if the reservoir totally empties. Could have some air bubbles in the piston - best to add the fluid slowly allowing the bubbles to perk up.

You should be able to skip the full bleed if you do the replacement this way:

- Skip the standard bench bleed, just plain messy

- Plug up the brake line connection ports using the plastic disposable bench bleed threaded plugs, put a screw in the nipple holes where the bench bleed short hoses are supposed to connect.

- Slowly fill the reservoir tipping it left'/right & back/forth to get the air bubbles to perk up. Fill a little, tip around, let sit, fill some more, tip, etc.

- Once reservoir is decently full, attach the MC and connect up the two brake lines.

- Get a friend to push down on the brake pedal and leave it there (don't pull it back up).

- Crack each of the brake lines nuts (separately) a little bit and let them spray some - should push out any air. Idea is just to crack a bit - just enough so you can get both done.

That's it.

PS - Another way to get the air out if the car is already off the ground with both front wheels removed. Connect up the MC a mentioned above, push the caliper pistons back a bit (like doing a pad replace) - that will force fluid into the MC and push air out. Only worth trying if the front end of car is already being serviced.

     
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