SOHC.co.uk Forums > Anorak's Corner
DoT 5.1 Brake fluid what specification do you use ?
Bryanj:
Not sure if its true but have read somewhere that the 5 boils at a lower temp than 3(when 3 is new)
K2-K6:
https://en.m.wikipedia.org/wiki/Brake_fluid
Information posted above is quite informative, and lucid, in discussing this. I hadn't looked before, but it seems to give decent appraisal of using silicone and why such a system would have any contaminate within it.
Also description of difference between 5.1 and 5 regarding silicone content and incompatibility or not.
McCabe-Thiele (Ted):
--- Quote from: K2-K6 on September 24, 2020, 09:31:26 AM ---https://en.m.wikipedia.org/wiki/Brake_fluid
Information posted above is quite informative, and lucid, in discussing this. I hadn't looked before, but it seems to give decent appraisal of using silicone and why such a system would have any contaminate within it.
Also description of difference between 5.1 and 5 regarding silicone content and incompatibility or not.
--- End quote ---
DoT 5.1 is not silicone based and can be mixed with all older Dot fluids fluids except silicone based fluids such 5.0.
DoT 5.1 is what I use in all my cars but will probably go for 5.0 for the Honda CB400F2.
Interestingly some cars now have none water based coolants that are more heat efficient than water/Ethylene Glycol based- the new generation coolants can be used retrospectively but every trace of water must be removed first. They make a special flushing liquid to remove every scrap of water - not cheap designed more for very high performance vehicles - very good for reducing engine corrosion from coolants. The flushing agents can cost around the same price as the waterless coolant itself so its an expensive conversion unless you have a fully stripped down engine to start with.
https://www.carparts4less.co.uk/p/evans-vintage-180-waterless-coolant-5ltr-993778061?gclid=CjwKCAjwh7H7BRBBEiwAPXjadrsC2OuV8WAb6mrckteD9t9qdPQ0b1HSdV3u2VPmC68ITog6DG-8rhoCrgMQAvD_BwE
K2-K6:
Yes I know that the two 5 denoted fluids are not the same. It's more that it causes confusion that somehow those responsible for naming the two have contrived to muddy the water by apparently putting one as a derivative of the other with the .1 iteration.
They really should have given one of them a different primary category to avoid potential conflicts.
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