DOT 3 and DOT 4 brake fluids

Most people in the automotive industry would be aware of the insistence from Toyota of the use of Dot 3 rather than Dot 4 fluids in Toyota vehicles, or warranty is voided on the brake systems of these vehicles. It appears that the 100 Series Landcruiser is the main vehicles affected by these potential problems, but it is worthwhile to note that on the reservoir of almost all Toyota vehicles it specifically states that Dot 3 is to be used.

So what is the difference between Dot 3 and Dot 4 brake fluid?

It has been generally believed throughout the industry that there is no difference between the two, apart from a higher boiling point with Dot 4, and the fact that it meets a higher industry specification standard.

But the experts say different…..

Most Australian manufacturers say there is a composition difference between the two. So, if this is the case, how is it that Toyota vehicles for years had Dot 4 fluids flushed through their system with no apparent problems?

It’s a valid question and perhaps the answer lies in the statement from one manufacturer of brake fluid in the UK who at least verbally have come out and said that they would warrant any problems that their Dot 4 fluid causes. They are obviously not expecting any problems with a Dot 4 fluid. You can research more about that particular fluid here

So what should you do, as the mechanic who services the next Toyota – well for what it’s worth we think it’s better to be safe than sorry. It means stocking another line of brake fluid, but NBS can supply them in both 500ml and 4L containers according to your needs.