Does anyone know of a good DIY guide on how to properly flush the brake fluid on the oem brembos? So far I have not been able to find one. Thanks!

Will

I would suggest getting a Mighty Vac (I got mine from Pepboys) and different colored brake fluid like ATE Super Blue so you'll know when the new fluid is through the lines.

The Mighty Vac makes it a one person job, otherwise you'll need a friend to pump the brake pedal while you open and close the bleeder.

Start with the right rear caliper, attach the mighty vac, crack open the bleeder and suck fluid until the new color comes through. Check the brake fluid reservoir often to make sure you aren't running out of fluid which will cause you to suck air into the lines.

Repeat at the left rear, right front and left front.

I am having a buddy help me. How much new fluid do i need to buy to fully flush the system out. Is it ok to add the new fluid to the reservoir with the old fluid at the beginning of the flush or should i try and get it as low as possible?

A liter should do it. You can add fluid to the reservoir at first. The important thing it not to suck air into the lines while bleeding.