Hi I have a 2004 Volvo with secondary air pressure problem wen I’m drive the gauge for the secondary

Hi I have a 2004 Volvo with secondary air pressure problem wen I’m drive the gauge for the secondary air tank going to 0 and back back to the normal air pressure can same one helping me please,wen I hold the brakes pedal I can see the secondary gauge going down little bit and hold the pressure I’m starting doing that wen the secondary it’s around 60psi the primary air gauge it’s around 100psi I already took to Volvo dealership but can’t find the problem

 

Please any clue???

 

Do you please know any mechanic I can take my truck to who knows about this problem because I already pay lots money to Volvo and the trucks still that with the same problem i appreciate thanks very much.

 

Nasriza can you please answer me what do you recommend me to do.to fixing my truck can you helping me please I thinking you are the only person here to understand about the problem on my Volvo

 

I still have the problem with my 2004 Volvo I have a full air tank on primary and secondary,and the secondary air gauge drop to zero and start buzzing and going back to the normal psi 135.going back and fort,I already changed the pressure sensor for the secondary air tank but still doing the same problem.wen I inverted the pressure air sensor cable the problem started doing on the primary air gauge any clue?????

 

I already replaced on the 2004 Volvo Cummis Isx lots parts but problem it’s not resolved took all the air leakings.

 

I replaced the air valve fittings but my gauge still dropped tho zero and started buzzing can you tell what’s can be this problem today I will replaced the cluster see if this problem will going way I appreciate if someone can helping me with this problem.