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FL&WVMIKE · 12-04-2020, 12:02 PM

DOT 5 is a silicone based fluid, and is not compatible with DOT 3... so the system needs to be COMPLETELY flushed in order to make the switch.

DOT 4 is basically Synthetic DOT 3, and is compatible. That's what I would probably use if the system already had DOT 3 in it.

There is also DOT 5.1 which I don't know a lot about... so I'm not going to pretend and give you bad advice in regards to. lol

12-04-2020, 12:02 PM	#12
FL&WVMIKE Senior Member Join Date: May 2010 Location: Daytona Beach, Fl & Spencer, W. Va, Posts: 4,442	Re: DOT3 or DOT5 Brake fluid DOT 5 is a silicone based fluid, and is not compatible with DOT 3... so the system needs to be COMPLETELY flushed in order to make the switch. DOT 4 is basically Synthetic DOT 3, and is compatible. That's what I would probably use if the system already had DOT 3 in it. There is also DOT 5.1 which I don't know a lot about... so I'm not going to pretend and give you bad advice in regards to. lol __________________ Mike Jr. here. I get on here every few months to check messages, and look through his almost 500 saved messages for information on the '29 and '34 I still have. A lot of very nice people on here. He truly enjoyed Ford Barn.