High pressure ss issue

[aca carwash 2]

I have two ss bays, when I run the high pressure in one bay a lot of water is coming out of the wand on the other bay. Where do I look for problems?

 

[I.B. Washincars]

Usually that's a bad check valve on the weep system.

 

[aca carwash 2]

Thanks I will try that

 

[Greg Pack]

Usually that's a bad check valve on the weep system.

To clarify, its a bad check valve on the bay that is running.