Sniper4x4

Stock 75 Corvette

I already ordered it and I now have the parts, this weekend I'm about to replace the Master Cylinder and upgrade the old rubber brake lines to new stainless steel brake lines the has stock disc brakes and I plan to flush the current fluid.

Which Dot brake Fluid should I add?

How much will I need?

thanks,
Ralph

flyeri

Dot 3 would be my choice. I think the last bottle I bought said Dot 3/4.

Paul L

I agree.

ksbunting

I agree that Dot 3 is what you should use: I asked this same question on this forum many years ago and was surprised that many of the members here replied and told me to buy the Dot 3 at a FORD dealership as it was the best for our Corvettes. It is Ford Dot 3 and I have used it for years.
I did so when I restored my 68 and the Ford parts guy was shocked when I told him who recommended the fluid.

Kurt

georgiaboy

I just finished a complete replacement of calipers, lines and master cylinder and used Dot 4. It has a higher boiling point than Dot 3 but is not silicone. It is supposed to be compatible with Dot 3.

Paul L

It has a higher boiling point but is not necessary for normal driving. But no harm done to use it. I have.

GaToy

The cover on my '76 calls for Dot 3 only.

MelWff

the cover says that because perhaps that was the highest available in 76. Not only is the boiling point higher as the number goes up but more importantly the hygrosopic properties increase, resistance to water absorption. So DOT 4 or DOT 5.1 would be an improvement

Paul L

You would have to flush the entire system if you went to DOT5 (silicone-based).

BBCorv70

That's true. The previous posting referenced DOT 5.1 which is glycol based, not silicone. DOT 5.1 appears to have the same temperature properties as DOT 5.

http://en.wikipedia.org/wiki/DOT_5.1

Paul L

Thanks for correcting me! The designations can be confusing.