From: Bjorn Brandstedt (super_deuce@hotmail.com)
Date: Sat Nov 09 2002 - 10:54:24 PST
Good info. We all learn from tossing ideas for others to respond to.
Thanks,
Bjorn
>From: "Liberty Krueger" <libertyk@bellatlantic.net>
>To: <mil-veh@mil-veh.org> (Military Vehicles Mailing List)
>Subject: Re: [MV] DOT-3 vs DOT-5 problem. Got them mixed.
>Date: Sat, 9 Nov 2002 12:02:03 -0500
>
>Incorrect. Never mix DOT-3 and DOT-5. They are not chemicaly compatible.
>When mixed they will begin to break down into a milky white residue. This
>residue doesn't make and effective break fluid and won't protect against
>corrosion or protect the seals. Never convert to a different type of brake
>fluid without changing the seals in the system because not all seal
>material
>is compatible with all fluids. If you use the wrong fluid it can break down
>the seal material and cause them to fail. Also the master cylinder is not
>vented to ambient air. The cap of the master cylinder should have a rubber
>bladder that separates the fluid in the reservior from the ambient air. If
>this rubber bladder is missing from the cap it should be replaced.
>Protecting the paint isn't the reason the military uses DOT-5. DOT-3 fluid
>begins to absorb water the moment that the seal is broken on the container
>it comes in and must be used immediately to maintain it's DOT rating. Any
>unused portion that is left over must be discarded after a few days because
>it's DOT rating can't be assured. The military converted to DOT-5 because
>it
>doesn't require any special handling and because it's DOT rating remains
>constant over the life of the product. Unused portions can be kept
>indefinitly with thier DOT ratings assured. Also vehicles that sit unused
>for extended periods of time experience no degradation of the brake fluids
>DOT rating when using DOT-5. With DOT-3 it's rating begins to degrade
>immediately after it's installed whether the vehicle is being used or not.
>
> >
> > Fact:When you accidentally add DOT-3 to DOT-5, you still have a complete
> > hydraulic system. The brakes will not fail. Most brake systems probably
>end
> > up with some water in them as a result of condensation (the master
>cylinder
> > is vented and exposed to the ambient air at all times), but the system
>still
> > works just fine with those two fluids. In the long run, there may be
>some
> > corrosion. This corrosion is more of a problem with DOT-5 since water
>may
> > collect at low points. Remember that the truck was designed for DOT-3
>fluid
> > and water mixes with DOT-3 but not with DOT-5 and seals etc are
>compatible
> > with DOT-3 for sure.
> >
> > Question: What is the real reason for using DOT-5 in MV's?
> > Personal opinion: DOT-5 was specified because it does not act as a paint
> > remover when spilled.
> >
> > Fact:When you pour DOT-3 fluid into a reservoir with DOT-5, then the
>DOT-3
> > sinks to the bottom, the fluids do not mix, but you still have a
>hydraulic
> > system of non-compressible fluids.
> > Assumption:There may be some problems at the extremes when the
>differences
> > in boiling points come into play, but having water in the system would
>be
> > more of a problem with its lower boiling point.
> >
> > Question: Would this statement be correct? "As long as the fluids are
>not
> > brought to a boil (from extreme driving, mountains etc), there is no
>reason
> > to be concerned when there are more than one type of fluid in the
>hydraulic
> > (brake) system".
> >
> > Bjorn
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > _________________________________________________________________
> > Add photos to your messages with MSN 8. Get 2 months FREE*.
> > http://join.msn.com/?page=features/featuredemail
> >
> >
> > ===Mil-Veh is a member-supported mailing list===
> > To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
> > To switch to the DIGEST mode, send e-mail to
><mil-veh-digest@mil-veh.org>
> > To reach a human, contact <ack@mil-veh.org>
>
>
>===Mil-Veh is a member-supported mailing list===
>To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>To reach a human, contact <ack@mil-veh.org>
_________________________________________________________________
Add photos to your e-mail with MSN 8. Get 2 months FREE*.
http://join.msn.com/?page=features/featuredemail
This archive was generated by hypermail 2.1.4 : Wed Apr 23 2003 - 13:37:50 PDT