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The balance valve allows the mechanic to produce a different braking
pressure between the front and rear wheels of the car. This is
necessary because the rear wheels don't have as much weight on them
during the braking action of the car. During braking, most of the
weight shifts to the front wheels. If this happens without a
proportioning valve, or balance valve acting on the system, the rear
brakes tend to lock up, causing a screeching noise while the
front brakes are not locked up. The balance valve allows you to
decrease pressure to the rear wheels in all situations where the
brakes are used the pressure is reduced by the balance valve.
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