Originally Posted by penpen989
about your brakes, im flushing out my old fluid and replacing it with some motul synthetic, do you know if just flushing it is enough to clear the system of the old fluid or will i have to run something through the system to get rid of all the old fluid before putting in the synthetic.
Just make sure you are using something compatable with DOT 3. A DOT 5 will not mix, and will potentially eat away your lines. A DOT 5.1 is perfectly safe and is good till 600* wet boiling point (ATE Super Blue). Make sure it's not a silicone brake fluid, they should never be used. If mosture gets into a silicone brake fluid it can cause a loss of the braking system.
For ABS do this order: Driver Rear - Pass. Rear - Driver Front - Pass. Front
For Non-ABS do this order: Pass. Rear - Driver Rear - Pass. Front - Driver Front
Then tell your helper to step on the pedal and press down gently but firmly. Open the bleeder valve and watch the fluid as it flows through the clear hose into the clear glass or bottle. Bleed as you would normally. When the fluid color changes from grungy black to some thing closer to what the new fluid looks like, you can stop. Close the bleeder valve and go to the next wheel brake. Be very sure to add fresh brake fluid up to the level in the reservoir every single time. (Basicly you do the brakes as normal but allow for the new fluid to get through each line)
For ABS before moving to the next wheel:
Before you do the final top-off (it might overflow), have your helper apply the brakes over and over, to exhaust the high-pressure reservoir of the ABS. This will cause the level in the master cylinder reservoir to rise slightly. It may take 25 to 35 pedal applications to do this, but when the level stops rising after a couple of dozen, that should be it. (There's a miata myth that the ABS will always store air pockets in it, which leads to the spongy pedal feel. I think doing this last step helps, at least it doesn't hurt)
This might not be how everyone else does it, but it's how I've done it. A vacuum pump makes things easy as well.