Still lean and brakes???

[REBEL GT TURBO]

My cars still running mega lean! :cry:

Can the master brake master cause this?
If I press the brakes in it has no resistance? And if I pump the pedal it goes mega lean then the engine stalls!? Is there an air lean on the master to fault??

Please help!

[LYNCHSTAR]

could be the one way return valve at the back of the manifold. or the one on the brake servo.