----- Original Message -----
From: "tonygull" <tonygull@ozemail.com.au>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Tuesday, January 23, 2001 8:04 PM
Subject: Re: [MV] CCKW...She brakes...Petersons Off-road
> thanx for that...i was actually thinking that myself...the main issue
> i guess is u r supposed to bleed every 1-2 years, but not many people do.
>
Well, not just bleed but completely change owing to the hydroscopic nature
of brake fluid. The problem is that entrained water in a _modern_ high temp
brake system where disc pistons have a large contact area with the pad, can
turn to steam giving the effect of total brake failure which, of course, is
unapparent when the ensuing wreck is investigated and the system has cooled.
(See the investigation of the fatal wreck that killed Princess Grace of
Monaco [Formerly Grace Kelly])
Why ever cars and trucks can't have the atmospheric sealing bellows in the
master cylinder like motorcycles I will never know.
> try an XJ Jaguar for instance-yuk...much, much easier on a CCKW, even
> allowing for 6.
>
But very much more essential. (You Yanks will buy this old British Leyland
rust-bucket dross.)
> Silicon is allegedly non-flammable and wont damage paint
>
True, but more difficult to bleed owing to entrained air and wholly not
recommended for modern vehicles that put large quantities of heat into the
system. It is intended for older vehicles that may stand a lot and put low
demands on the fluid, also some twit, confusingly, has officially called it
DOT 5.1 which is handy when the top spec regular fluid is DOT 5 and has led
to a huge re-labelling campaign here.
> do u know to what exxtent the old brake fluid needs to be removed,
> ie what % of contamination of the silicon is permissable?
>
Totally. Something approaching zero contamination is the aim.
The system should be purged with methylated spirit, I think that's
de-natured alcohol in the US.
Richard
Southampton - England
This archive was generated by hypermail 2b29 : Mon Feb 05 2001 - 07:13:51 PST