Randall,
Interesting. I have been running DOT3 in my TR4A since I got the car
drivable (about 2 years now) and only used DOT3 because there was a big
sticker on the side of the master cylinder telling me "USE ONLY DOT 3 BRAKE
FLUID OR WARRENTY IS VOID". I was wondering how big a PIA it would be to
flush out the DOT3 fluid and replace it with DOT5. I have read many posts on
this list where people have used DOT 5 with no issues so I am considering
changing over as I should probably replace the current fluid after 2 years
anyway.
Dave Connitt
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Randall
Sent: Monday, March 28, 2016 4:09 PM
Cc: triumphs@autox.team.net
Subject: Re: [TR] TR6 brake master cylinder
> That was going to be my next question. About how carefully one had to
> drain the dot 4 when installing dot 5. It sounds like I can put in my
> fresh MC, fill it with silicone, then bleed each brake till I see
> purple fluid.
Another contested question. My experience is as Paul said, just "bleeding
through" will not remove all of the old brake fluid from the system.
However, I saw no ill effects from the small pockets of old fluid left over.
The DOT 5 will not mix with the old fluid, and is slightly less dense, so
you get little pockets of fluid in corners that don't get used (like the
base of the rear slave cylinders). The DOT 5 also surrounds it, so it can't
promote corrosion (and I assume not absorb water or salt).
Main disadvantage seems to be that the remaining DOT 3/4 will suck all the
purple dye out of the DOT 5.
Randall
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