[jdkskyking]

Newell just finished replacing all eight airbags with new ZF airbags. 

   

When Newell removed the drive tires they found a cracked rotor and brake pads destroyed. 

   

   

My advice is to pay to have the tires removed and visually inspect and measure rotor and pad thickness.


I requested that an alignment be completed since I replaced all eight control arm/bushings for the drive and tag axles. 

During the process the tag axle hydraulic pressure was check. Gauge indicated 150 psi. 100 psi low! I DID NOT HAVE A TAG AXLE INDICATOR AT THE DRIVER POSITION. 
The pressure sensor had also failed. That’s two failed sensors on my coach since I’ve owned it. In theory, when the pressure in the ZF RAS drops below 230 psi, a warning light should illuminate at the driver annunciator panel.

We noticed two of the hydraulic lines that connect the REAR CENTERING CYLINDER to the rear ZF RAS  HYDRAULIC BLOCK were wet. We replaced all four lines with a high quality line. Cost was $150 at a local Miami OK shop Newell uses. 

   

Newell has decided to increase the ZF RAS hydraulic pressure to 275 psi. 
I’m in the process of determine what the accumulator nitrogen charge should be set to. 


As a reminder, I was told that the ZF RAS pressure accumulator has a 10 year lifespan and the system pressures should be checked annually. 

I certainly hope to continue to increase my knowledge on the ZF suspension system and work to keep owners informed. 

JK