![]() ![]() Nowhere have I seen anything saying "this is ok". However mixing for example Glycol DOT3 with Glycol DOT4 would give unpredictable performance. This thranslates to not mixing DOT 5 with any other DOT standard fluid. Generally this is a bad idea, but the main thing warned against is mixing Silicone based fluid with Glycol. DOT5 is exclusively silicone based because only silicone meets the criteria specified by the DOT5 standard. ![]() There are based on two materials: Glycol based ("traditional" brake fluid) and Silicone based. ![]() The difference between them is a specificed standard regarding the boiling temperature, which rises as the DOT number rises, and amount of water absorption. The information & links posted by Paulster2 offer excellent explanation of what the various types of brake fluid are. Has anoyone used DOT4 synthetic & DOT4 'doesn't mention synthetic' at all ? Are they ok to mix together ? Obviously I don't want to be mixing fluids wrongly but I also don't want to go replacing the brake system unnecesarily either ! 3) something I haven't thought of and won't know til I get it all apart.Fortuately owing to a bit of luck the car and I escaped unharmed.ġ) The reason I had to top the Master Cylinder up in the 1st place was a hint at impending troubles, and the new brand of brake fluid has ntohing to do with this.Ģ) Mixing the DOT 4 and DOT 4 synthetic has caused some issue with the rubber seals. As a result I nearly had a nasty accident. I don't think my usual supplier's bottles has this word.Īfter topping up with the new brand, a few days later the brake master cylinder gave way such that the pedal didn't operate any brakes (little/no resistance) but no fluid was leaking from amywhere. However recently I bought another brand of DOT 4 brake fluid whcih had the word "Synthetic" written on it. I have always used DOT4 brake fluid with this, and another car of similar age, with no troubles. The car in question is a 1971 Morris Traveller. I should point out I'm English and the products described are bought in the UK, in case it makes a difference. I couldn't see an existing question about this but please link to it if you know of one. ![]()
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