Losing Air Pressure

[Russ Knight]

I'm losing air when sitting with the service brakes applied. Leaking brake diaphragm somewhere?

 

[simp5782]

I'm losing air when sitting with the service brakes applied. Leaking brake diaphragm somewhere?

Leaking thru intake? Which tank pressure is losing air?

 

[WillWagner]

Or a foot valve if it is leaking with foot on the pedal.

 

[Russ Knight]

Thanks guys. I'll check those things.

 

[Russ Knight]

Leaking thru intake? Which tank pressure is losing air?

It's leaking into the intake, Wes.

 

[Monkeyboyarmy]

Quick release valve under front cross member? QS2

 

[Russ Knight]

It's leaking into the intake, Wes.

@simp5782

Losing air on the Primary circuit with brake pedal depressed.

 

[Russ Knight]

Thanks to Wes, problem isolated. It is the brake pedal valve assembly. Ordered a new one today.

 

[captcarc]

Thanks to Wes, problem isolated. It is the brake pedal valve assembly. Ordered a new one today.

I lose 20# of air pressure, out through the engine intake, every time I press the brake pedal. Did replacing the brake pedal valve assembly at the brake pedal fix the problem? Where did you buy it and how much? Thank you!

 

[Russ Knight]

Got the part, I haven't done it yet, but it is definitely the problem. I ordered it on eBay, under 100 dollars.

Foot Control Valve