From: V SCHWARTZ (vsaws@optonline.net)
Date: Fri May 05 2006 - 05:16:51 PDT
Hey John, What was the problem with your M816 before you changed the
master cylinder? I have been going nuts with the brakes hanging up on my
816 for almost 2 years. I have changed 3 airpacs and 2or three master
cylinders plus the flex lines in the back. I have had my suspicions all
along that the problem is something stupid that either I have done or
failed to do properly.
----- Original Message -----
From: "Hutterer, John (MPAU)" <john.hutterer@smiths-medical.com>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Thursday, May 04, 2006 8:59 AM
Subject: Re: [MV] M35 brakes
>
>
> 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.
>
> John
>
> -----Original Message-----
> From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On
> Behalf Of Patrick Jankowiak
> Sent: Wednesday, May 03, 2006 8:46 PM
> To: Military Vehicles Mailing List
> Subject: [MV] M35 brakes
>
> Sometimes I notice that the brake pedal has alot of travel before
> 'hitting the brakes' when the truck's running gear is cold. After run a
> while down the hiway, the pedal does not travel as far before 'hitting'
> the brakes, even though the brakes have not been used since I pulled
> away from the starting point. No problems stopping, DOT5 fluid, but this
> is odd, anyone know what it might be?
>
> Patrick
>
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