Class 1 Practice
Results
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#1. You're driving a vehicle equipped with an automatic front-wheel limiting system (ratio valve). If you brake hard during an emergency stop, the air pressure delivered to the front brakes will be approximately _____ of the air pressure to the rear brakes.
The front-brake limiting effect is greatest for brake application pressures below 40 psi (276 kPa). At brake application pressures over 60 psi (414 kPa), there is no limiting effect; the air pressure delivered to the front brakes equals that delivered to the rear brakes.