SOHC.co.uk Forums > CB750

Brake master cylinder.

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Johnny4428:
All seals replaced and new brake pipes, so no traces of old fluid within system Bryan.

K2-K6:
Dot 4 & 5 are compatible so won't give you any realistic problems as seal compatibility exists between them.

Apart from being less corrosive for 5 I understand it as Bryan put,  that it doesn't effectively absorb water.

It's a odd situation though as Dot 4 holds water in suspension,  and so reduces boiling point as %i ncreases. The same water ingress to Dot 5 effectively drops to the lowest point of the system IF it were to get into the system in the same fashion.  This would also reduce effectiveness in a similar fashion.

Characteristic of bike systems though with a "bladder" type seal in master cylinder, they have very very small potential ingress of water to the effectively closed system and so doesn't really have to be considered in a normal service schedule. Nothing really to worry about if all components are to specification and working properly.

Incompatibility generally in brake systems comes from those using mineral oil as the seal specification are different to the Dot type systems.

Laverda Dave:
Don't bother trying to paint the master cylinder as being anodised the paint won't stick even if you use a primer and it will craze before flaking off. Ask me how I know :-[

sye:
I painted mine just fine. Use a dremel wire brush to remove the old finish and prime with etch primer. Top coat in satin black, job done.

Seabeowner:
Dot 5 fluid is more compressible than 4 or 5.1. Don't know how much difference that makes on a small system. Bought some a while back and not tried it. And not that it worries our old machines it is not recommended for ABS as far as I know.

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