bleeding brakes

[ka50]

Ok, search didn't help.

When bleeding brakes (I'm going to invest into bleeder screws), let's say you pump once and fluid gets lower... do you immideatly (between each pump) add more fluid into the master cylinder reservoir or you let all fluid come out from the line and then pour fresh brake fluid? Wouldn't that create vaacum and as soon as you open you'll introduce air into the system? Then you'll have to push that air out with fresh fluid or something? Am I understanding this correctly?

[93camaro_zzz]

You shouldnt have to add it between each pump. There is a difference between bleeding the brakes, and flushing the brake system. If you have a soft pedal, you need to bleed the brakes, and if you fluid is contaminated and black and ugly, then yuo need to flush it. Flushing it, involves getting all of the fluid out of there and replacing it with new stuff. I think there is an order the flushing the system, that i dont know off the top of my head. Cuase remember, there is also fluid stuff in your proportioning valve, and some in the ABD controller thing. If you are just bleeding, then bleed each wheel till no air, and then top it off. It should use a whole resevoir of fluid, just bleeding. Good luck. ;)

[FunkZ]

Just don't let the resevoir run empty or you'll introduce air into the lines and have to start over again. Refill it when you switch to another wheel or when you've got about 1/4 left in the resevoir.

[ka50]

Can I first drain the whole thing (til it's empty), then refil it and flush the same line again ( to get rid of possible air), then do other lines?

The brake fluid most likely has never been changed, so I think it's time to do a complete flush. How about ABS module? WHere is it located?

[FunkZ]

If you drain the resevoir you're introducing air into the system. It would be better to bleed each line until you have new clear fluid coming out at each wheel. This will be very easy to see if you use piece of clear tubing over the bleed screw. The first one you do will take a bit more for the new fluid to work its way down. Make sure to keep an eye on the resevoir and add as needed.