Yes I let the lines drain all day checking and rerfilling the mc . It is a nhra legal car so everything about the brakes have been changed . I even pulled a vacum on all lines . I think it has something to do with a pressure vowl from the distribution box . Some master cylinders have inside something to slow down the pressure to keep fluid from backing back out of the lines when one releases the pedal , like 3 pounds of release . I am thinking that switch is bad for releasing the pedal shoots all fluid out of the master cylinder with the lid off . It is the front brakes fluid cavity that blows dry instant .