[RockyMtnProDriver]

Originally Posted by bob h

Even if the red dash valve leaks out to the TP control port, there is still no air on the blue line unless a service brake application is made.

So, in order for air to leak out the blue line, you would require a 'second' leak; the first leak is through the red dash valve, the second leak through the foot valve (where the blue air comes from), and it's VERY unlikely that foot valve air would leak from 'supply' to 'delivery'.

In the original post, he says the air is leaking out the Blue Line when he is making a brake application, and red and yellow dash valves are out.

[Rcbm007]

Can I bobtail

[Fozzy]

Dude, You're posting on a thread from 2009.. Whats up?