210) The function of a proportioning control valve (PCV) in a brake system is to

ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation

reduce the brake fluid pressure when the brakes approach their lockup point

cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level

cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

Answer is:

cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

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211) The condition that causes vapour locking in a brake system is

Answer is:

overheating of the fluid due to frequent brake application

Explanation:

The condition that causes vapour locking in a brake system is overheating of the fluid due to frequent brake application.
Although brake fluids are designed to work at extreme temperatures above 250 Degree Centigrade but still as the age of brake fluids goes on increasing, it starts loosing its properties and hence under high pressure and temperatures developed by applying brakes causes vapour lock.