From: SGM PANTANO (TRUKS1@msn.com)
Date: Thu May 04 2006 - 17:42:57 PDT
On the M816's...there is an air system to the back...which controls brake
boost also... If it leaks -- your brakes are in deep trouble...
Deuces --once they have a leak... you are also in deep trouble.. Air in the
syster ...?/ What caused it to begin with.?/ A leaks cylinder.?? Well -- if
you had a bad one..you now have sludge in the system..and it has to go...
Flushing the system with mineral spirits..and replacing with fresh fluid
usually does the trick..
Gene
> That sounds like a possibility. There should not be any air in there, but
> some could have gotten in.
>
> Thanks!
>
> Hutterer, John (MPAU) wrote:
>
> >
> > Patrick,
> >
> > I have an M816 wrecker and was having similar problems. It was filled
> > with new silicone brake fluid, after I had replaced the master cylinder.
> > I thought that I had bled the brakes properly, with help from a friend
> > pushing on the pedal, but must not have been as thorough as I should
> > have been. I let the truck sit for several days, and then hooked up a
> > pressure bleeder to it. I connected a clear plastic hose to each bleeder
> > valve and watched the fluid as it came out. I was absolutely amazed at
> > how much air was still trapped in the system. It took me nearly a gallon
> > of fluid to bleed it completely out. A friend, who is a mechanic for the
> > Army Reserve, says that it is his standard practice to bleed the brakes
> > on a vehicle, let it sit over night, and bleed them again in the
> > morning. He invariably finds that there is still air trapped in the
> > system in the morning, and that it comes out with the second bleeding.
> > The brakes on my 5 ton work perfectly now.
> >
>
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