From: chris case (chriscase@sbcglobal.net)
Date: Wed Aug 03 2005 - 09:23:13 PDT
Bjorn, you are once again confusing drive .line accessory braking with disc
mains. The accessory system doesn't
t have this problem. The most common (autos) system uses a dual master
that puts the same psi to both the front discs and the rear drums. The gizmo
that's called a proportioning valve is only a 'bad hydraulics' idiot light
switch. The differential of braking between front and rear is accomplished
by engineering a less efficient rear brake system. The match up f/r has to
be close to the variations of vehicle loading- everything is a compromise.
The only thing that prevents one wheel from turning backwards under engine
braking is physics, the same physics are still in play when a pinion brake
is added.
----- Original Message -----
From: "Bjorn Brandstedt" <super_deuce@hotmail.com>
To: <chriscase@sbcglobal.net>
Cc: <mil-veh@mil-veh.org>
Sent: Tuesday, August 02, 2005 7:56 PM
Subject: RE: [MV] disc brake pressure, et al
> That's my concern, how do you match the two brake types operated from a
> common line?
>
> If the disks brake before the the drums all the problems of driveline
> braking appear. If the drums are wet, they will not not be as efficient
> and again the driveline braking problems show up.
>
> 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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>
>
>
>
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This archive was generated by hypermail 2.1.4 : Fri Oct 28 2005 - 23:25:25 PDT