RE: [MV] disc brake pressure, et al

From: Glen Closson (glen_closson@earthlink.net)
Date: Tue Aug 02 2005 - 21:03:58 PDT


Unless of course you have a locking or limited-slip differential. The
opposite side will spin in the same direction as the other wheel.

Regards,

Glen
May the Joys of today be those of tomorrow!
May the goblet of life hold no dregs of sorrow!

-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On Behalf
Of Bjorn Brandstedt
Sent: Tuesday, August 02, 2005 8:39 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] disc brake pressure, et al

"And as far as one wheel spinning backwards, what is there in the stock
system to prevent it? Yet the issue is never raised unless pinion braking
is mentioned."

This is how I see it:
If the driveshaft is locked then the "sum" of the two wheels spinning must
equal zero. That's how a differential works.
So, the two wheels can drag on the pavement, which would produce a zero
"sum" or they can rotate in opposite directions and produce a "sum" equal to
zero. The wheel with most traction will force the other side to turn in
reverse to produce a "sum" equal to zero.

When the wheels are braking at the wheels (service brakes) then the drive
shaft is still spinning from the engine/transmission. If one wheel locks up,
there is nothing making the other wheel reverse direction unless the
transmission is placed in reverse. The drive shaft will change speed that's
all.

Does that make sense?

Bjorn

--

>From: "chriscase" <chriscase@sbcglobal.net> >To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org> >Subject: [MV] disc brake pressure, et al >Date: Tue, 2 Aug 2005 19:26:23 -0700 > >Disc brakes do require more overall pressure to work. That's why they >have large or even multiple pistons, piston area may be 6 times as >large, giving >6 times the pressure. The sole advantage of discs is that they use most >of their circular travel to give off heat while only a small section is >being heated by friction. > >Using a pinion brake as an add on should be trouble free, since it's >braking will be in addition to the stock drums- the drums will prevent >the one wheel from spinning faster than the other, afterall, you still >have just as much braking in the drums as ever. Adding a pinion brake >will not add horsepower to the spinning wheel, only add more surface >area to the brake system to dissipate heat. > >And as far as one wheel spinning backwards, what is there in the stock >system to prevent it? Yet the issue is never raised unless pinion braking >is mentioned. > > > >--



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