From: Bjorn Brandstedt (super_deuce@hotmail.com)
Date: Tue Aug 02 2005 - 13:21:12 PDT
Funny thing that you'd bring up pressure in the brake lines. Last week I
installed a 3,000 psi gauge in the line to do some checking of possible
residual pressure in the lines (there was none). However the pressure
registered 1,800 psi. Just FYI.
As far as matching the disc brakes with drum brakes, the problem is that
drum brakes are non linear and can lock up.
Drum brakes can be modern too, look at all the tractor trailer rigs in this
country, mostly drum.
Heat dissipation is a big thing with brakes and that's the reason for the
mass of the drum brakes.
Cooling a disc brake that's facing the direction of travel is different from
one that's aligned with the wheel. The six drum brakes on the deuce can
dissipate 12,000 watts of power each (plus or minus). Three disc brakes
("pinion") would have to dissipate about 24,000 watts each to compete with
that if used alone.
Arthur, how much power can your pinion brakes dissipate?
In stop and go traffic, the engine braking effect is usually enough to slow
down with only an occasional tap on the service brakes. What I'm saying is
that the brakes are rarily tested and oil and dirt builds up so when they
are really needed they won't perform.
Perhaps we should use the brakes more just to keep them in good condition.
I think this is an important subject and it should be discussed freely.
Bjorn
>From: MV <MV@dc9.tzo.com>
>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>Subject: Re: [MV] Fw: [MV] Rockwell differentials - brake line pressures
>Date: Tue, 02 Aug 2005 14:21:34 -0500
>
>
>Actually that is probably not true. Disk brakes typically require a lot
>more PSI than drum brakes to get the same amount of braking action. Disk
>brakes on a trailer typically require about 1500 psi - the equivalent drum
>brakes require only about 800 psi or about half the pressure. I'd bet that
>the brake system in a duece or 5 ton operate at a lot less than a 1000 psi.
>
>Dave
>
>Sando wrote:
>>The brake pump already installed on our trucks "should" be enough to our
>>particular application, if it's enough to operate those huge inefficient
>>brake shoes imagine what it can do to a modern caliper! (Of course I can
>>be
>>mistaken) Anyways, it must be costly though, so I think I'll drop an email
>>to A P Bloom for his pinion brake !!!
>>
>> Sando
>>----- Original Message ----- From: "Sean Nichols" <armytrucks@gmail.com>
>>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>>Sent: Tuesday, August 02, 2005 12:18 PM
>>Subject: Re: [MV] Rockwell differentials
>>
>>
>>I saw that show too. And I got all excited about that setup until the
>>host told us viewers that in order to make those disc brakes on the
>>ends of your Rockwell axle work, you had to run the master cylinder
>>from a 1 ton Chevy truck... a vacuum boost unit.. to get sufficient
>>line pressure.
>>
>>Now where exactly are we M35 multifuel operators going to get a
>>sufficient amount of vacuum to operate that new master cylinder? And
>>I don't think it will fit the truck very well without a significant
>>amount of hacking and fabrication. Back to the drawing board.
>>
>>
>>
>>On 8/2/05, Sando <asando@prtc.net> wrote:
>>
>>>List, You might want to check this web site for disc brake conversions
>>
>>for
>>
>>>our trucks, it was on a 4x4 truck TV show WWW.differentialeng.com
>>>
>>> Sando
>>>
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>>>
>>
>>
>
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