Have a '95 Hilux Surf (KZN130). 3" lift. Have been told by a couple of people that the rear brake valve (I think that's what it's called?) needs adjusting. Just wondering if anyone has done this adjustment to compensate for the lift - and if they could share how to do it properly.
Refer to image below. This is what needs adjusting, correct? If yes, up? How far etc.?

Thanks.