Need some help with Brake issues

BobW said

The surge in the reservoir is entirely normal, it's liguid not air. It has to do with the return.
The drop in levels is not. You have a leak somewhere in the system, check your rear wheel cylinders.
BTW, Cardone products are generally rebuilt, not new.
The oil light issue is a wiring issue, you've crossed or misconnected something during the MC install.

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I did some reading and found out about the rear drums maybe the issue so I am going to readjust those, as far as the brake light I have a mess with any of the wiring and the oil light is disconnected and taped off and the prop valve connevtor is still on but I will double check. Still kind of new to brake systems so I was unaware that that surge is normal I had been thinking that it is air what is a good sign then the master cylinder is actually good so I will try to re bleed the master cylinder and go from there.