I did not mix and match the parts. I got an NOS booster pack for the M211.
I have not touched its master cylinder as yet.
It is true that the M211 and M35 parts look somewhat alike, but the mounting
brackets and the brake line fittings are in different places, so you
couldn't inadvertently switch them.
It would be hard for me to believe that the check valve for the brake
hydraulics is in the booster pack, which is mounted over the rear axles in
an M211. I suppose it is possible, but it seems like it would also be
unsafe to have it so far away from the master cylinder.
Joe Garrett
cell 425-344-1402
-----Original Message-----
From: Jeanne Lacourse [mailto:cckw@mediaone.net]
Sent: Friday, June 08, 2001 5:49 PM
To: Military Vehicles Mailing List; Joe Garrett
Subject: Re: [MV] M211 Brake Problem- Any ides?
Importance: High
The M35 and the M211 have different airpacks and master cylinders. On the
M211, the check valve is in the booster as I recall. If you mixed and
matched, you may have a system with twin check valves.
Technically at least the master cylinders are the same. One has the check
valve, the other doesn't'
This is quite funny as the WW2 GMC CCKW has the same master as the M35, but
the GMC M211 has a different one (no check valve). I have my opinions on how
GMC was dealing with the government during WW2 and after.... The WW2
Chevrolet is also quite different from the WW2 CCKW in stupid things like
the closed cab dashboard. The same dash, but they drilled the holes for the
extra switches in different places. Go figure!
Steve AKA Dr Deuce(s)
----- Original Message -----
From: Joe Garrett <j.garrett@gte.net>
To: Military Vehicles Mailing List <mil-veh@mil-veh.org>
Sent: Friday, June 08, 2001 8:20 PM
Subject: [MV] M211 Brake Problem- Any ides?
> My M211 has a weird brake problem. When you apply the brakes, they stay
on
> for a while. The brake lights stay on, too, so there is pressure on the
> whole system, for about 5 to 10 seconds after the brakes are released.
>
> I put a new booster pack on the truck and this seems to have made the
> problem worse by making the brakes work better. The reason I replaced the
> booster pack is that if you opened the air tanks so there was no air
boost,
> the brakes wouldn't do this and the truck was driveable. This "implies"
> that the problem is not the master cylinder check valve, and that it
resides
> in the air system.
>
> This same thing happened on one of my M35's, too, but I just replaced
> everything; booster, master cylinder and finally all the wheel cylinders
> (the rubber boots were in pieces). I don't know which of these items
fixed
> the problem. It just went away.
>
> Anybody have any idea what is going on here? It is not the brake lines.
> They are fairly new, and they are downstream of the brakelight switch.
>
> Joe Garrett
> cell 425-344-1402
>
>
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This archive was generated by hypermail 2b29 : Thu Jul 05 2001 - 00:40:35 PDT