Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
1.0		Normal level	Level control raise/lower switch (S77/1s2)	Engine: at idle LED's in switch: OFF Measure and record distance A at front and rear axle.
		Vehicle level at stage 1		S77/1s2 in position: raise level stage 1 (press switch 1X). As soon as LED in switch is constantly lit: Measure and record distance A (Figure 1) at front and rear axle.	Vehicle height increase: +15 mm at front axle +15 mm at rear axle	Leveling Valve Pressure Test 33 (if no change in level is noted at front or rear of vehicle). Internal Leakage Test, Front Axle Circuit 34 Internal Leakage Test, Rear Axle Circuit 35
		Vehicle level at stage 2		S77/1s2 in position: raise level stage 2 (press switch 2X). As soon as LED in switch is constantly lit: Measure and record distance A (Figure 1) at front and rear axle.	Vehicle height increase: +15 mm at front axle +15 mm at rear axle (Total level change =30 mm)	Leveling Valve Pressure Test 33 (if no change in level is noted at front or rear of vehicle). Internal Leakage Test, Front Axle Circuit 34 Internal Leakage Test, Rear Axle Circuit 35
		Normal level		S77/1s2 in position: Normal level (press switch down 2x) As soon as LED's in switch are OFF: Measure and record distance A (Figure 1) at front and rear axle.	Vehicle height decrease: -30 mm at front axle -30 mm at rear axle There may be some delay in leveling to normal level, if vehicle is stationary.	Leveling Valve Pressure Test 33 (if no change in level is noted at front or rear of vehicle).