I've been reading for the past few years the problems with using DOT 3 brake
fluid vs the merits of the DOT 4 silicone fluid in the TR's systems. One
www site advised on the newer TR series (TR6 and 7's) it was fine but was a
problem with the rubber in the older TR's (2 to 4). Recent posts on this
list advise not using DOT 3 as it breaks down and disintegrates the rubber
in all Triumphs due to the type of rubber being used. I've recently
replaced the clutch system and rear brake pistons and used DOT 3 but am now
looking at going to DOT 4 due to the above comments. What is the best way
to flush out the DOT 3 and replace it with the newer DOT 4. Is it as easy
as draining out the 3 and replace it with 4?
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