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Brake master cylinder.

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cbxman:

--- Quote from: Johnny4428 on October 05, 2021, 08:44:08 PM ---Thanks guys, next question is this being quite a simple brake system will it work with Dot5 silicon based brake fluid, don’t think it has the paint stripping qualities.

--- End quote ---

Hi John,

I have had DOT5 in my CBX, front and rear, for 20 years after a full strip and rebuild and have not touched the brakes since.  Japanese bikes tend to be OK with Silicon.  I believe that Italian bikes are not compatible, but that is old information.  Things may have moved on in that regard.

As mentioned before, Just make sure every part and pipe is cleaned and change all the rubber parts together.  No problem.

Cheers,

Jerry

Yoshi823:

--- Quote from: K2-K6 on October 06, 2021, 01:05:00 PM ---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.
--- End quote ---

DoT 4 and 5 are not compatible. It is DoT 5.1 which is.

I used DoT 5 back in the early '80s for my Honda CB750F2 Special & never had any problems. It did need very careful bleeding as tiny air bubbles would compress under braking if not bled successfully.

K2-K6:
Yep, you're right and I missed the  .1 there  :-[

It's even written on the cap of systems I'm currently working with

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Albeit on mountain bike hydraulic brakes.

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