Discussion
Which valve reduces rear brake pressure to prevent rear lock-up?
Answer: B
Weight transfers forward under braking so the rear wheels lock first unless their pressure is limited, which the proportioning valve does above a threshold. Residual pressure valves exist for drum brakes but serve a different purpose entirely. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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