Discussion
Assertion (A): Rear brake pressure is limited by a proportioning valve.
Reason (R): Weight transfers to the front axle during deceleration.
Select the correct answer from the options below.
Answer: D
The rear axle carries less weight under braking, so its wheels lock at a lower pressure and must be limited to keep the vehicle stable. The reason therefore explains the assertion, and rear lock is the instability that the valve exists to prevent. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.
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