[TR] TR6 brake master cylinder

Randall TR3driver at ca.rr.com
Mon Mar 28 14:09:24 MDT 2016


> 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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