2005 Tahoe Bleeding brakes question

[Jason in DLH]

Can you elaborate on the mixed brake fluids? Are you referring to topping it off with a different kind or draining the whole system and not getting it all out?

Dot 5 is Silicone based while Dot 3 and 4 are Glycol based. Hence, Dot 3 and 4 can be mixed, but if you want to convert to Dot 5, then it’s a good idea to remove all other fluid first (including purging the ABS).