Thanks, I'd better be careful then !


My Sierra is 2WD, and came with this rusty bias valve.





I'm switching to a 4x4 ABS system and plan on using the valve that is on the 4x4 ABS block.


They look similar in construction, so after a good dip in citric acid, this one is going to get stripped to find out what's going on inside it.


Does anyone know what goes on inside one of these ?