I gravity bled my system and my pedal is mushy, not good. My question is how low can fluid in the master cylinder get before it sucks air? I was thinking it could get close to empty, but I think I saw something in there sticking up. I let it get to like 30 % full during the bleeding. Is that my problem? I let it get to low?

 

I mean't "how low can fluid in the brake fluid resevoir"

 

I'm not sure how low, but I have done the gravity bleed twice. I just sucked all the old fluid out that I could, then filled it up to the MAX level and started bleeding them. My fluid level never go that low (and neither should yours).

The brake pedal was rock hard right after finishing, but then after a lapping day not so hard. I really like this method of bleeding brakes though, even if it is a waste of time.

 

The problem must be that the lines were bled incorrectly before the gravity bleed. In other words, gravity bleed probably doesn't work well when the system already has air in it.

I'm going to bleed tonight using manual two man method. If that doesn't work then there must be air in the master cylinder, which I will have to bleed.

 

So I two man bled all four corners. Serious air came out of the passenger front. No air came out of the other corners.

This car is better, but still not stopping anything like it should. Here is what I had done. Machined rotors, goodridge steel lines and hawk HPS pads.

I did the bed in procedure twice in the car. Once after the initial gravity bleed, which probably wasn't sufficient given the available pressure, and once after two man bleed, which I was able to engage ABS during.

I am wondering if the master cylinder was damaged during the initial two man bleeding disaster performed by guys that said they new what they were doing.

Does anyone have experience with either messing up a master cylinder, or getting air in there and having a tough time getting it out?

 

the symptoms are slightly mushy pedal, no initial bite and the car will simply not stop in the distances it did before, this even when giving all the leg I can into it.

 

I guess I will two man bleed again and see what happens.