I would recommend sticking to specs. Don't know what will happen with the 4.
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Pro 5.0 STS, C&L CAI with D/S 93, Steeda UDPs, Spohn LCAs & UCA, FRPP 4:10, JPC D/S, Eibach springs, D Specs, P/h bar, Chr VCs, FM 40s, BO Strut Brace, Seq. TLs,
The manual recommends DOT 3 fluid. I am going to do a bleed & flush. Can I upgrade to DOT 4 fluid?
Dot 3 and 4 are fully compatible with each other meaning you can even mix them if needed. Primary difference is Dot 4 has a higher boiling point than Dot 3. What you want to stay away from is mixing Dot 3 or 4 with Dot 5. 5 is completely different and in some cases detrimental to your braking system.
If you want the full benefits of Dot 4 you will need to flush out the Dot 3. When doing this, do not allow ANY air to get into your braking system. That air will reak havoc on your ABS module and in most cases has to be pressurized out at a shop.
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It would seem brake fluid doesn't "circulate" much, if at all. Once the fluid is near one of the calipers, it doesn't get back up into the reservoir to mix unless "pushed" up there as when you manually compress the caliper when changing pads.
I have had people just suck out the fluid from the reservoir only and refill it with new fluid, but I would suggest flushing out the whole system via bleeding the brake lines while feeding the DOT 4 into the reservoir. This way you can be assured you have DOT 4 at/near the calipers where the heat is.
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05 GT Vert Auto, Saleen S/C 10psi VMP tune, Roush springs,D-Specs,Steeda LCAs,Swaybar,Panhard bar & brace,Spydershaft,TruTrac,3.73,BBK shortys,Corsa A/B.
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