If all four measurements are within the set values in SDS/DAS, and the side-to-side deviations are within tolerances, “SAVE” the measurements into Romess.Ĭheck the voltage values being displayed for the level sensors and compare them to the values that you recorded earlier in this STEP. Go to the right front axle and use the “F5” or “F6” keys until you obtain a reading within the set value range, and within the permissibleĪdjust the left rear ride height with the “F7” or “F8” keys until it is within the set value range for the rear axle.ĭo the same for the right rear, being certain that the readings are within the acceptable side-to-side deviation range.ĭouble check your measurements with Romess at all four corners starting at the left front. Raise or lower the vehicle with the “F3” or “F4” keys, while measuring the left front ride height with Romess, until you obtain a reading within the set value range for the front axle as indicated by SDS/DAS. Record the specified voltage ranges for the level sensors.ĭisplay “Actuation of level valves” screen with the set values for front and rear axle inclination angles. If you are working alone it will be necessary to maneuver SDS/DAS beneath the vehicle. The next screen displays information regarding when level calibration is necessary, what equipment should be used, the specified voltage ranges for each of the level sensors and a brief description of the calibration process. Navigate to “Main Groups / Control Units / Chassis / AIRmatic / Control Unit Adaptations / Level Calibration” If any of the measurements are out of specification proceed to STEP 4.Ĭonnect Mercedes DAS interface to the vehicle. Raise the vehicle on the lift, use Romess, measure and store the ride height data. Starting at the left front wheel, measure the ride height and select “SAVE”. Move to the right front wheel, measure the ride height and select “SAVE”. Measure the left rear and right rear ride heights, selecting “SAVE” after each one. After all 4 corners have been measured, selecting the “MEMORY” button will display all 4 readings simultaneously. Check the readings against the specifications that you previously recorded, in STEP 2. If all 4 readings are within specifications, and the side to side deviations are within acceptable limits, no further calibration is necessary. Document your measurements on the Repair Order.
Ride height check and calibration must be performed on a level alignment rack or MKS compliant alignment rack.Ī.) Vehicle on level alignment hoist, remove pins from slip and turn plates.ī.) Be certain that the “Emergency Brake” is not applied and a brake pedal depressor has not been installed.Ĭ.) Settle the suspension using the “Ride Height” switch. (Raise the vehicle using the ride height switch and wait 2 minutes. Lower the vehicle using the same switch and wait 2 minutes ) There are thousands of cases of successful ride height adjustments wit STAR diagnostics ( SDconnect c4, mb star c3) but you will not be able to get things much beyond a 1.25 to 1.5 inch drop. An an ABC car (car with Active Body Control) make sure to do a load calibration when complete. Here is some useful tips aimed at how to lower an ABC car, which sounds like a PITA.
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