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Just wondering if DOT 3 and DOT 4 brake fluids are interchangable? My zook says run DOT 3 only but was this made before DOT 4 was around (87)? The only difference I can find is that 4 has a slightly higher boiling temp. Supercheap only had dot 4 and I need to top up the brake fluid so is it ok to mix with the dot 3 if thats whats in it?
its all the same. Just some chemical difference. One of them is easier on the seals, so i think older cars use dot4 or sumthing . Stopping wise its all similar, and even with the seal thing I dont think its a huge fuss
I thought that DOT 4 said on the lable somewhere that is compatible for all DOT 4 and DOT 3 appliclations.
Im only going by memory here though.
I know the silicone/synthetic stuff can cause problems but I think you will be right with DOT4.
Its the seals etc, if you use a dot4 fluid in a dot3 system you can have alot of problems with your seals deteriorating. However its likely that all your brake components have been serviced, in which case they are likely dot4 compliant anyway.
Having said that, I dont think I have ever found a dot4 fluid that isnt dot3 compatible, so perhaps when dot4 first came out it was different enough to cause problems, but the newer style is cross compatable.
. Stopping wise its all similar, and even with the seal thing I dont think its a huge fuss
