I couldn't see an existing question about this but please link to it if you know of one ...
I should point out I'm English and the products described are bought in the UK, in case it makes a difference.
The car in question is a 1971 Morris Traveller.
I have always used DOT4 brake fluid with this, and another car of similar age, with no troubles.
However recently I bought another brand of DOT 4 brake fluid whcih had the word "Synthetic" written on it. Hmm. I don't think my usual supplier's bottles has this word.
After 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. As a result I nearly had a nasty accident. Fortuately owing to a bit of luck the car and I escaped unharmed.
I see a few possibilities :
1) 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. or ..
2) Mixing the DOT 4 and DOT 4 synthetic has caused some issue with the rubber seals.
- 3) something I haven't thought of and won't know til I get it all apart.
Obviously I don't want to be mixing fluids wrongly but I also don't want to go replacing the brake system unnecesarily either !
So the question ..
Has anoyone used DOT4 synthetic & DOT4 'doesn't mention synthetic' at all ? Are they ok to mix together ?
thanks for all help