From: Steve & Jeannie Keith (cckw@comcast.net)
Date: Fri May 13 2005 - 13:17:51 PDT
It almost sounds like the actuation valve on the booster is screwed up.
Is the booster holding the brakes ON when the engine is running and you
have a hard pedal?
AHHHH Light dawns over Marblehead.... You probably have 2 check
valves in the hyd system. Remove the one from the master and try it.
The M35 and CCKW masters need the chack valve, the M135's do not.
Other than that, the 3 masters are the same!
Steve AKA Dr Deuce
----- Original Message -----
From: "chance wolf" <chance_wolf@shaw.ca>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Friday, May 13, 2005 4:13 PM
Subject: [MV] CCW/CCKW Brake Experts
> I've worked on M135 brakes, M35/M54 brakes, M38/37/151/MB/M38A1 brakes and
> M75 brakes, but the CCW system is the spawn of Satan.
>
> I know how it's *supposed* to work. The CCW I'm working on has a
> civvy-style hydrovac mounted on the opposite side to the usual CCKW
> mounting, but hooks up exactly the same way. I've replaced the one that
> was
> in there with an identical unit, and replaced all the wheel cylinders,
> most
> of the brake lines (Copper!), and bled everything a few million times in
> addition to checking the one-way vacuum valve on the manifold - but each
> time we fire it up - the brake pedal is as hard as a rock and refuses to
> travel so much as a quarter-inch while the engine is running.
>
> If you shut the engine off and let the vacuum dissipate, you have brakes
> after a fashion - but I wouldn't want to be travelling downhill with any
> sort of load. The only thing I *haven't* changed as yet is the master
> cylinder, but seeing as it will stop the vehicle without the vacuum
> assist,
> it seemed to me that the master cyl was unlikely to be at fault.
>
> Any help appreciated. This is one of those vehicles I'm mighty sick of
> right about now, and I'd just like to be able to park it under the carport
> with a 'Fit for Duty' tag on it and never look at it again. :)
>
>
>
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