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Old 04-29-2014, 05:28 PM   #11
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Thanks for the reply but I am not sure where this measurement is taken. I had new tires and front airbags installed last July but never heard anything about this measurement. I would like to check it out before we start on our extended summer trip.
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Old 04-29-2014, 06:07 PM   #12
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Marty I think it's in the book that we got at CFL. It tells how the measurement us to be taken. It's something that most ships get wrong. In fact FR reset mine before the upgrade and I had to have FL redo it. I'm not home right now but I will look to see where the instructions are. It's a bit complicated because you need to match up the exact chassis and model. The correct measure for ours is 10.5 as mentioned above. The measurement I think is from the ground to the middle of the shock bolt but I would need to review that before I did any change. It's been a couple of years since I looked at it.
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Old 04-29-2014, 06:45 PM   #13
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In this write up, it says to measure from the lower flange on the frame rail to the center of the lower shock bolt. This is from Freightliner's manual.

5. Check the ride height of the air suspension by
measuring the distance from the center of the
lower shock bolt to the bottom of the frame rail.
See Fig. 1. See Table 2 for height control valve
adjustment measurements. If ride height is incorrect,
adjust the air suspension.
Height Control Valve Adjustment Measurements
Suspension Measurement
Inches ±1/4 (mm ±6)
AS120 (front) 10 (254) or
10-1/2 (267)*
AS140 (front) 11 (279)
IFS114 (front) 17-1/2 (445)
IFS ZF (front) 15-3/4 (400)
ADL-RS17/19/21 10-1/4 (260)
AD200-RS17/19 9-3/4 (248)
AD200-RS15 9-3/8 (238)
ADTB280 (rear) 17-1/4 (438)
Airliner 15k (rear) 8-3/4 (222)
AD123 (rear) 18 (457)
ADL123 (rear) 11 (279)
* Some vehicles have a different shock location. When this is the case, the
vehicle will have a 55 degree wheel cut. Ride height for these vehicles
should be set at 10-1/2 inches (267 mm).
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Old 04-29-2014, 07:06 PM   #14
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Thanks Tom. I didn't think measuring from the ground was correct.
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