Rear brake noise
Looks like a different thread there. But you should always replace drums and rotors in pairs. The dimensions will be the same and so will the materials.
Different mfgs. use different alloys. Ceramics are very good and not noisy. Don't know what make of van you have there but the Chryslers have an adjustment for front/rear brake bias.
It is a valve with a lever attached that moves when the van nose dives on braking.
