Is it ok to use DOT 5.1 brake fluid in a new set up on a 66 C10? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

msg · 12-20-2019, 11:39 AM

Im redoing the components in my braking system and will have a fresh start. New Master Cylinder, Calipers on the front, cylinders on the rear drums and new lines. I was about to buy DOT 3 and fill er up but Im reading that DOT 5.1 is compatible with DOT 3 and is better. Anyone done this already? Or should I just stick with DOT 3?

wixthedog · 12-20-2019, 02:01 PM

5.1 is compatible with 3 and 4, but not 5.

5.1 and 4 both have higher boiling points so if that is something you are after it would be wise to use it. If not, and you don't want to pay the premium, Dot 3 will still work fine.

12-20-2019, 11:39 AM	#1
msg Registered User Join Date: Feb 2013 Location: GA Posts: 1,325	Is it ok to use DOT 5.1 brake fluid in a new set up on a 66 C10? Im redoing the components in my braking system and will have a fresh start. New Master Cylinder, Calipers on the front, cylinders on the rear drums and new lines. I was about to buy DOT 3 and fill er up but Im reading that DOT 5.1 is compatible with DOT 3 and is better. Anyone done this already? Or should I just stick with DOT 3? __________________ Progress thread for my 66 http://67-72chevytrucks.com/vboard/s...d.php?t=623848

12-20-2019, 02:01 PM	#2
wixthedog Registered User Join Date: Sep 2019 Location: Magnolia, TX Posts: 225	Re: Is it ok to use DOT 5.1 brake fluid in a new set up on a 66 C10? 5.1 is compatible with 3 and 4, but not 5. 5.1 and 4 both have higher boiling points so if that is something you are after it would be wise to use it. If not, and you don't want to pay the premium, Dot 3 will still work fine. __________________ Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto



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