From: santoken@bright.net
Date: Tue Aug 02 2005 - 19:17:57 PDT
Actually, a late model vehicle with ABS, in a panic stop, are capable of pressures four times that.
Kent
>
> From: MV <MV@dc9.tzo.com>
> Date: Tue Aug 2, 6:13 PM
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Subject: Re: [MV] Fw: [MV] Rockwell differentials - brake line pressures
>
> 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
> >>>>
> >>>> ===Mil-Veh is a member-supported mailing list===
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> >>>> To switch to the DIGEST mode, send e-mail to
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> >>>> To reach a human, contact <ack@mil-veh.org>
> >>>>
> >>>
> >>>
> >>
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> >
> >
> >
> >
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> >
>
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