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
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