[Mgs] Brake Fluid disappearing

Mogrits mogrits at gmail.com
Sat Apr 21 07:53:44 MDT 2018

I'll respectfully disagree, unless in the 31 years I've owned my '72B the
seal technology has changed. It was well recognized in the 80's and 90's
that DOT3 was the kiss of death for British brake seals. Maybe all those
rubber based seals are gone now. When I first bought my B I topped up with
DOT3 and within 2 weeks was re-doing my entire system. My mechanic was
eager to point out the admonishment on the reservoir cap to use Castrol LMA


On Sat, Apr 21, 2018 at 9:11 AM, PaulHunt73 <paulhunt73 at virginmedia.com>

> Not so, DOT 4 and DOT 5.1 are both compatible with DOT 3 and you can
> change the fluid without doing anything else, they are all glycol-based
> fluids.  Having said that all seals in hydraulic systems are supposed to be
> replaced every 3 years or 36k.
> It's DOT5 that is the problem, that is silicone-based and cannot be mixed
> with any of the others, you have to go through a several-stage flushing
> process to change to that fluid from one of the others.  Going back is even
> worse.
> Originally DOT 5 was introduced because it had a higher boiling point than
> DOT 3 or DOT 4.  But it cannot be used in ABS systems so DOT 5.1 was
> developed which equals it in performance.
> PaulH.
> ----- Original Message -----
> ... If you ever used DOT3 you need to replace every seal in the system.
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