CAMARO6 - View Single Post - Is all DOT-4 Fluid the same?

cdrptrks · 06-08-2020, 06:57 PM

You're welcome! According to the brake manufacturer Raybestos, wet boiling point is 3.7% moisture and dry is 0%. Idk if the boiling point temperature decrease is linear as moisture % increases or not.

This is the type of moisture tester I mentioned. Only $7 so not sure on the accuracy level but I tested 3 year old 600 degree F DOT4 fluid on another car before changing it and it jumped between 2-3% moisture. I definitely wouldn't go much more than a year between DOT4 brake fluid changes on a car driven on track though. Also some high torque aftermarket race brake pads can generate more heat on track and require using the absolute most expensive brake fluid like SRF and titanium shims on heavy cars like the Camaro.

06-08-2020, 06:57 PM	#4
cdrptrks Drives: 2017 Blue Camaro 1SS 1LE with PDR Join Date: Sep 2018 Location: Houston, TX Posts: 966	You're welcome! According to the brake manufacturer Raybestos, wet boiling point is 3.7% moisture and dry is 0%. Idk if the boiling point temperature decrease is linear as moisture % increases or not. This is the type of moisture tester I mentioned. Only $7 so not sure on the accuracy level but I tested 3 year old 600 degree F DOT4 fluid on another car before changing it and it jumped between 2-3% moisture. I definitely wouldn't go much more than a year between DOT4 brake fluid changes on a car driven on track though. Also some high torque aftermarket race brake pads can generate more heat on track and require using the absolute most expensive brake fluid like SRF and titanium shims on heavy cars like the Camaro. Last edited by cdrptrks; 06-08-2020 at 07:16 PM.