Actually there are FOUR cams per wheel...two on top and two on the anchor
points at the bottom. You have to remove the inspection port on the drum and
check pad to drum spacing at 8 and 11 o'clock for the front pad and 5 and 1
o'clock for the rear pad ( 8 and 5 o'clock clearance is 0.010" and 1 and 11
o'clock is 0.020". Bottom check/adjustment is done first.). If out of spec
you do the bottom cams before doing the drag routine with the top cams.
Check the manual if this sounds confusing.
Ron
----- Original Message -----
From: "Joe Garrett" <j.garrett@gte.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Friday, September 21, 2001 9:22 AM
Subject: Re: [MV] M35A2 Weak Brakes -- Need Suggestions...
> Sounds like your air pack is working fine. With it disabled, though, your
> brakes should work just as well, but be much harder to apply. The airpack
> is simply "power brakes". It does not increase the braking power of the
> system. It works exactly like a vacuum booster but uses positive
pressure.
>
> The next stop should be to adjust all the brakes at the wheels. Each
wheel
> has two bolts on the back of the backing plate. They are cams that adjust
> the brakeshoe. Jack up each wheel until it turns freely. Start turning
the
> wheel and turn the adjusting cam nut until the wheel stops turning. Back
it
> off until the wheel turns without dragging. Do this on both cam nuts. as
> each one only controls half the brakes on that wheel. Once you have
> adjusted all six wheels, you may have to adjust the brake pedal itself, as
> it may be set too tight. Symptoms will be brakes lights that take a long
> time to go off, or brakes that stay applied after you release them.
>
> The next stop is to flush the system. If it was my truck, I would
> completely flush the system with DOT 3 brake fluid. From your
description,
> changing the brake fluid is most likely what is needed. (The changing to
> DOT 3 is a separate issue based on opinion).
>
> When workign properly, the brakes on an M35 are just as effective as
> anythign you will find on a modern pickup truck. You should not be
feeling
> uncertain of their stopping power. Just because you asked the question, I
> would say there is defintiely something wrong.
>
> Let us know how you make out. We don't get a lot of feedback from these
911
> calls.
>
>
> Joe Garrett
> cell 425-344-1402
>
> -----Original Message-----
> From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org]On
> Behalf Of Jim Newton
> Sent: Friday, September 21, 2001 1:14 AM
> To: Military Vehicles Mailing List
> Subject: [MV] M35A2 Weak Brakes -- Need Suggestions...
>
>
>
> Hi List...
>
> A friend (thanks, G!) drove my M35A2 last week and told me the brakes
> are very weak.
>
> This being the first M35A2 I've ever even SEEN, let alone drive, I
> thought the brakes were normal.
>
> So I emailed to another lister (thanks, J) and he gave me some good
> suggestions, and indicated it might be the air pack.
>
> So I tested the air pack by opening the air tank bleed valves and
> draining the air tanks to no pressure, then driving (carefully) the
> truck to see if the brakes were the same or worse. They were WAY
> worse, with almost no braking. This means the air pack is working at
> least a little bit.
>
> So I'm not sure what to try next.
>
> Could the air pack be only working partially?
>
> Could the brake shoes be worn or glazed?
>
> Could the hydraulics be going bad?
>
> Should deuces stop easily if the brakes are working properly, or are
> they always scary at stoplights?
>
> Here are some facts:
>
> o Brake fluid full (silicone as specified on sticker)
>
> o Brake pedal is firm (not spongy as if bleeding were required)
>
> o Air pressure charges up to a full 120 PSI
>
> o Trailer air brake line shoots air when brake is pressed
>
> o Small air puff hiss sound is heard when brake is released
>
> o Tremendous leg strength is required to stop
>
> o No leaking brake fluid around master cylinder or wheel cyls
>
> o I have not inspected brake shoes or drum inner surfaces yet
>
> Thanks!
>
> --
>
> Jim "Ike" Newton
>
> o 1984 M1007 CUCV Military Suburban
> 6.2 Liter Turbo-Diesel Engine
> 5/4 Ton Cargo Capacity, 4WD
>
> o 1971 M35A2 Military Troop/Cargo Truck "Deuce and a Half"
> 478 Cubic Inch Turbo-Diesel Multi-Fuel Engine
> Air Shift Front Axle
> 2 1/2 Ton Cargo Capacity, 6WD
>
> See them at: http://www.CUCV.net
>
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This archive was generated by hypermail 2b29 : Mon Oct 08 2001 - 10:59:00 PDT