From: MV (MV@dc9.tzo.com)
Date: Tue Aug 02 2005 - 15:13:35 PDT
Wow, I had no idea that they were using braking pressures that high.
The typical sedan with drum brakes (not many of those around now) had
brake pressures of about 1000 psi max.
I don't think that Arthur's disk brake addition was meant to be the
primary brakes, just an additional braking resource. That would make a
lot of sense to me if the M35 brakes are really that bad.
Personally I think I'd try and improve the M35 brakes first before
adding more stuff, but that's just my opinion.
They have some pretty good brake materials that were not available years
ago that might make the brakes a lot more effective. I just put some
carbon ceramic disk brake pads on a 2 ton truck and they stop really
well. A lot better than the original pads.
Dave
Bjorn Brandstedt wrote:
> 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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>
>
>
>
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>
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