Brake bias valve

[mark]

My car passed iva fine with standard sierra drums at the back with no bias valve to reduce rear effort

All parts were brand new execept the m/c and the rear drum back plates

The rear was one pipe with a t piece to each drum

The tester siad the car was well within spec and a few times i have locked them up on purpose in real world conditions with to see what would happen with weight transfer etc and the rears never lock first

Its strange how some peoples cars need reduced pressure to the rear to pass and others dont

Spud passed sva with the same setup