Tyres 2
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Brake Tips

Brake Fluid

Brake Fluid 2



Brake Fluid

Be aware that all brake fluids are Hygroscopic, which is that is that they absorb moisture. You can't stop it; your brake fluid is taking water from the air right now ! That's why we always keep our DOT3/4 whatever, in a sealed container.

So what happens when the water content of your brake fluid gets too high ? Well, the disc gets flippin' hot, the calliper gets flippin' hot, the fluid in it gets flippin' hot, that's what. What happens to water when it boils ? It turns into steam darn quick is what. They used to run trains on the stuff. Steam expands quickly and under enormous pressure, so where can it go ?

The answer is it expands fast and slams your brakes full on, Wham !

Not a nice scenario, so the rule is, change the fluid completely, every two years (three at the most). Check the colour, it's clear when you pour it from a sealed container. Pale yellow is 1to 2 years old.

Yours is heading toward brown ?, then it should have been changed at least a year ago, probably 10.
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Brake and Clutch fluid Dot 3/4/5

Dot 3 and Dot 4 hydraulic fluids are both Glycol based and can be mixed.
So you can top up or replace your Dot 3 with Dot 4 fluid if that's what you've got (Dot 4 is better).
You can't do this the other way around though; if your system says to use Dot 4 then you can't go backwards to Dot 3, you must use Dot 4 only

There is now a Dot 5 fluid (for extreme conditions, we don't go there) Dot 5 is not compatible with Dot 3 / 4 under any circumstances, don't use Dot 5 unless your system is designed for it..
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