Stop in for a cup of coffee

Icetech said

Dot4 won't eat rubber and has a higher boiling point, Dot5 is based on silicone and east rubber.. 4 is fine though

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Hmmmm so DOT 4 has a better/higher boiling point , something to think about, I have all new rubber lines, all new wheel cylinder in the rear, new disk up front, maybe 7 to ten feet of old line running to the rear.