A. To adjust the pressure to 9.3 bar on vehicles with a Haldex air dryer.
B. To adjust the pressure to 9.3 bar and to prevent the pressure flowing back to the air dryer.
C. It's a check valve to allow the four-way valve to function if air is lost in one of the circuits.
D. It allows the pressures in the circuits to be regulated between 6.5 and 9.3 bar.
QUESTION 2. What is the correct order of filling of the circuits in a 4 series vehicle?
A. Handbrake, rear circuit, front circuit, accessory circuit.
B. Rear circuit, front circuit, accessory circuit, handbrake.
C. The handbrake first and then down to the lowest capacity last.
D. Circuits with the lowest capacity first, and then the handbrake last.
QUESTION 3. When will the APS allow pressure to rise to 12.4 bar?
A. After the vehicle is started when the pressure had dropped to below 6 bar.
B. If the brake system needs this pressure for a higher axle loading.
C. On a decline and when the air suspension system needs it.
D. When the APS wants to regenerate.
QUESTION 4. How is the compressor activated?
A. By falling air pressure in the brake system.
B. Electrically by the air dryer.
C. By the falling pressure in the air dryer filter.
D. By the back pressure on the outlet from the air dryer.
QUESTION 5. When does the blowdown valve in the air dryer close?
A. After the regeneration tank has blown empty.
B. After the compressor is activated again.
C. When the moisture is blown out of the air dryer.
D. When the air pressure in the air tank of the brake system has dropped
A. To adjust the pressure to 9.3 bar on vehicles with a Haldex air dryer.B. To adjust the pressure to 9.3 bar and to prevent the pressure flowing back to the air dryer.C. It's a check valve to allow the four-way valve to function if air is lost in one of the circuits.D. It allows the pressures in the circuits to be regulated between 6.5 and 9.3 bar. QUESTION 2. What is the correct order of filling of the circuits in a 4 series vehicle?A. Handbrake, rear circuit, front circuit, accessory circuit.B. Rear circuit, front circuit, accessory circuit, handbrake.C. The handbrake first and then down to the lowest capacity last.D. Circuits with the lowest capacity first, and then the handbrake last. QUESTION 3. When will the APS allow pressure to rise to 12.4 bar?A. After the vehicle is started when the pressure had dropped to below 6 bar.B. If the brake system needs this pressure for a higher axle loading.C. On a decline and when the air suspension system needs it.D. When the APS wants to regenerate.QUESTION 4. How is the compressor activated?A. By falling air pressure in the brake system.B. Electrically by the air dryer.C. By the falling pressure in the air dryer filter.D. By the back pressure on the outlet from the air dryer.QUESTION 5. When does the blowdown valve in the air dryer close?A. After the regeneration tank has blown empty.B. After the compressor is activated again.C. When the moisture is blown out of the air dryer.D. When the air pressure in the air tank of the brake system has dropped
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