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Just pointing something out that I recently learned from a rebuilder of air packs and it makes sense to me... I'll leave it at that. However back to my actual air pack question (and Clinto's) in post 32, Does anyone know if either airpack has the residual pressure valves?

It may not be a problem, I'm just putting it out there that its something to be aware of. Both single and dual circuit trucks have the same 6 wheel cylinders that require the same volume of fluid (Dot 5) to operate. If the hydraulic side of the airpacks are the same size, then more pneumatic...

Maybe a better way to say it is that your safety factor is much lower with the short style air pack on a single circuit truck. If shoes are adjusted tight then its probably okay, if they are fairly loose or you have a leak somewhere then you may run out of "stroke" on the short air pack where as...

Does anyone know if either airpack has the residual pressure valves? I'm pretty sure the short ones must because the Master Cylinder in an A3 doesnt have them, but I am curious on the long airpacks. Also I posted this elsewhere but I think its important..... I'd personally wouldnt use the...