Bias valve

[Ben]

Hi guys,

Changed my rear beam from a drum one to a gti one around a year ago. My drum brakes had a bias valve in the line and also a compensator.
The new beam had neither of these and I just assumed that on the older cars the brake lines just went straight from the front into the brakes, so this is what I did.
I've recently heard a couple of people saying that the bias valve is very important, and I'm thinking maybe I shouldn't have removed it? :/

Anyone fancy explaining what should be in a braking system?

Ben