There's no problem with bleeding/flushing the brakes on an ABS car, there are just a couple extra steps you might need to take. The Miller cup cars we ran use a stock ABS system and we flushed the system every couple of races since they used stock brakes and really punished them, even the motec ABS system we run on the vipers has its own bleed routine built into the software.
If you want to flush out the old fluid you can just do a standard bleed routine. Always start at the caliper farthest from the master cylinder/reservoir and work your way closer, if you have a caliper with a bleed on both the inside and outside, always start on the inside caliper. Like Dean stated sucking all the old fluid out of the reservoir can speed up the process considerably, then after that just continue to bleed each corner until the fluid runs clear and your set. Make sure you keep an eye on the reservoir and keep plenty of fluid in it so you dont suck air into the master.
Once you get the fluid to run clear on all 4 corners rebleed each corner with the engine running. This will get the ABS pump to cycle and force any air out that might get caught in the ABS circuit. You'll obviously need somebody on the stupid end of the brake pedal to help you out on this, and having the car up on jackstands/blocks will make the whole procedure much easier.
The synthetic fluid is definitely the right stuff if you can spend the cash ( we use castrol SRF, about $75 a quart) if not get a good quality standard brake fluid, (Motul RBF 600 or 660)
If you have any questions or feel a little uneasy about doing it yourself swing by the shop and we can get you sorted out.
Tyler
Alchemy Motorsports
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