[TR] Converting from DOT3 to DOT5 hydraulic fluid in my TR4A

[Greg Lemon]

I started using DOT 5 about twenty years ago.  I have been driving British
cars for over 40 years, the first twenty were filled with frequent
hydraulic rebuilds and hardware replacement, seems like something would go
on a car every year or two when I was running DOT 3.

Until recently my experience with DOT5 was very good.  Then my brake master
cylinder went out a couple years ago, when I inspected it there was visible
corrosion on the bottom of the bore (installed new about 9 years prior, car
has led a sheltered life since).  I have pictures of it somewhere, but too
lazy to dig up now.

My conclusion was water got in the system, pooled at the bottom of the
bore, and led to a leak.

So my experience with DOT5 is mixed, I still think I have fewer leaks with
it, and when it does leak it doesn't eat paint.   After replacing the
various hydraulic bits I am still running DOT 5, but I don't trust the
school of thought that you don't need to flush or flush the fluid as often.

I have not noticed any more difficulty in bleeding or mushy pedal.

I know this is always a hot topic, and my conclusions are by no means based
on any scientific study, but I am comfortable enough with them to share
with the group with no reservations.

Greg Lemon, TR250



On Sat, Aug 21, 2021, 1:59 PM <keithstewart at bell.net> wrote:

> Amen.
>
> Keith Stewart
>
> -----Original Message-----
> From: auprichard at uprichard.net <auprichard at uprichard.net>
> Sent: August 21, 2021 7:35 AM
> To: 'William Pugh' <anabil007 at comcast.net>; 'Dave Connitt' <
> dconnitt at fuse.net>
> Cc: 'Triumphs' <triumphs at autox.team.net>
> Subject: Re: [TR] Converting from DOT3 to DOT5 hydraulic fluid in my TR4A
>
> Do we really need snippy posts like this? Everyone is entitled to an
> opinion without having to endure this.
>
> Andrew Uprichard
> Jackson, Michigan
>
> -----Original Message-----
> From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of William Pugh
> Sent: Friday, August 20, 2021 9:02 PM
> To: Dave Connitt <dconnitt at fuse.net>
> Cc: Triumphs <triumphs at autox.team.net>
> Subject: Re: [TR] Converting from DOT3 to DOT5 hydraulic fluid in my TR4A
>
>
>
>
>
> why in Earth would you…or any one want to do that?   Ego, perhaps?
>
> > On Aug 20, 2021, at 4:26 PM, Dave Connitt <dconnitt at fuse.net> wrote:
> >
> > Hi All,
> > What is the preferred way to convert from DOT3 to DOT5 hydraulic fluid
> in my TR4A. The clutch is going to be easy as the leaking master cylinder
> and slave are being replaced and the short hard and soft line will be
> fairly easy to flush. I need suggestions regarding the brakes.
> > Thanks,
> > Dave Connitt
> >
> > Sent from my iPhone
> > ** triumphs at autox.team.net **
> >
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