Re: IML: No Regret on Bad Brakes, DOT 5 has bad juju, I think

[santiam oregon <santiamoregon@xxxxxxxxx>]

on this same thread, I've collected all new parts and am in the process of installing and had planned on using silicone/dot 5, however when I discussed it w/ a friend who is also a really good mechanic, he reminded me that new master and wheel cyls. are lubricated w/ dot 3 when they are put together, so you'd probably want to at least wipe the cups down and wash them w/ brake clean or silicone fluid before you install them if you plan to use Dot 5. 

I've decided to just forget the gamble and use the synthetic/dot4 fluid, which is compatible w/ old dot 3 and should be fine.  I completely rebuilt the brake system on another old car in 1990 and it sat outside in Oregon rain for 9 years (someone else owned it during that time) before I got it back and the brakes are still very good w/ dot 3 after 17 years. 

 

Todd

Portland, OR

Kenyon Wills <imperialist1960@xxxxxxxxx> wrote:

> On 10/11/07, PAUL WENTINK
> wrote:
> >
> >
> > If the pedal goes away when the car sits it has
> absolutely NOTHING to
> > do with changing to DOT 5.

Maybe.

Considering that absolutely every piece besides the
drum backing plates is new (see my Epic on 1960 page
for photos) , including all metal lines on the frame,
I'm not inclined to suspect that this is a
component-related problem. Maybe a bad part, and I do
intend to address it when I get back on that horse,
but it loses pressure over 6-12 months, not overnight.

I'm too lazy to do the research for this message to
butress my argument, but I've seen things about DOT5
doing funny things to rubber like weeping over time
that support my suspicion.

Pedal works fine if I pressurize it, holds for days or
weeks even. It's just after months and months that I
got and continue to get surprises, the first one
landing me across the street in Myrtle's lawn when I
tried to use my rebuilt brake system and it declined
to operate.

No need to diagnose further here - car is in cold
storage and terribly incomplete, but I remain
convinced that I'd go with 3 if I did it again, so
that's what I was getting at.



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