I want to convert to dot 4 brake/clutch fluid, and I want to know if there are any potential issues. I boiled my brake fluid during some spirited driving, and I think dot 3 is no longer an option. Any problems with corrosion in using dot 4?

How do you bleed the abs unit? I would think that bleeding the brakes alone would not affect the abs unit, and I need to rid the entire system of the dot 3.

Any suggestions on specific brands of brake fluid that wont boil when I want to have fun in the twisties? It will also need to be able to withstand the Michigan winter.

 

I live in Canada. I'm running DOT 4 too, the GM Dot 3 is shitty and gets dirty real fast. I don't know how you're doing this fluid exchange but I work in a shop so I have access to our brake fluid flush machine. It's literally just dumping in fluid as it's sucking fluid out of the bleeder. You don't have to bleed the ABS unit, the fluid just routes through the entire system. I'm running a brand called BG. You might feel the pedal will be a tad softer than with the old fluid after you go for a test drive, but that's normal.

 

Only difference with DOT3 and DOT4 is boiling point, DONT EVER mix DOT5 with DOT3 or DOT4 bad bad news bears.

Just take it to a shop that does brakes and flush the DOT3 out with DOT4

 

Wilwood 570 (I think thats the number) or Motul 600 are good DOT 4 fluids to use.

 

ive heard a lot about the motul fluid, so ill go with that one. Does the machine at the shop flush it any better? I also doubt they will let me run alcohol through their machine to flush out the dot 3.

 

The little bit of dot3 fluid should have minimum affect on the boiling point of the fluid, as long as the shop is a good shop.

 

i have wilwood 570 and ss lines and never had a problem with boiling since and my track sessions are about 30 mins a piece...

 

Shouldn't be a problem at all - just flush through the bleeders thoroughly with the Dot 4, and you're good to go. Its a pretty easy swap-over.

 

operator error is to blame on this isssue.

 

since when is finding the limits of your vehicle operator error? more like driving 101 if you ask me :P

 

ATE SuperBlue Dot4 is the best. It actually comes in yellow and blue. Bleed your brakes in the correct order (it's on here somewhere) and when you start seeing only blue fluid coming through you're done with that line. When it comes time to change use the yellow so you know when you've got the new stuff in the lines. Then the blue. Then the yellow. Repeat as necessary.

 

WOAH WOAH??? Alcohol?what for..... just flush with the dot 4 you will never get it all out and you would only damage internals with alcohol

 

ive read in several sources that you can use denatured alcohol to help it flush more thoroughtly. it isn't very corrosive at all. in fact, brake fluid is like 10x more corrosive. I also have a vacuum pump to pump out the alcohol before i refill with brake fluid.

 

Motive products makes a good kit to bleed brakes. You basically fill a reservoir with new fluid and pressurize that tank. Then open the bleeders in order until fresh fluid comes out. Sorry for the lack of a link but google them.

 

ATE is not the best but it does a good job for how cheap it is.

ATE dry boiling point = 536*F, wet boiling point = 388*F

Motul 600 dry boiling point = 595*F, wet boiling point = 421*F