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VR6 GT35 4mo
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11,887 Posts
Master cylinder is the only thing left. Booster doesn't affect it. You're trying to move an incompressible fluid, so if it compresses, there is air or the fluid is passing the seals in the master.
 

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VR6 GT35 4mo
Joined
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11,887 Posts
You don't need to bin the fluid btw. Just reuse it.

Unlikely, but could be dead out the box. If the seals were bad it would pass even with the engine off though. IMO it's just air. You could take your old ABS pump and fit bleed nipples onto the outlets, bleed it through and prove the master. Bit of work though.
 
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