Brake Bleeding Woes...
 

I decided to finally do the brakes on the Supra, they have not been bad but they have not been great. I've been meaning to do them since I got the car a year ago. There were the requisite lumps that used to be the bleeders and the brake fluid was black. To make a long story short replaced all four calipers and pads + new rotors in the front. Drained the brake lines - this may have been my fatal mistake. I now am not able to bleed the brakes properly. I bled the master cylinder according to the TSRM and it does not *seem* like I have any air in it. When I try to bleed the rear passenger caliper, I don't get really much of a flow out of the bleeder. Air does get pushed out but any fluid seems to come out very slowly if at all. Even though it did not seem to be working well I went ahead and bled them in order. I did get a good amount of fluid out the front. The issue is the system does not seem to hold brake firmness. You pump the brakes and they get hard but then after 10 seconds you can push pedal to the floor again. Is this symptomatic of air in the system? I do have ABS, I am planning on trying to pressure bleed the system this weekend to see if that will bleed/flush the system properly. Any further tips/advice on what I may be doing wrong?

Lunch2000

haha yea, i have the same problem with mine, ive been bleeding it out, but thats because my brakes were just crap, replaced all the calipers + rotors but im workin on bleedin them out, but yea, if it loses firmness im guessing its still because you have air in it, unless somone wishes to correct me, id say just keep bleeding them untill its good.

the quickest way to bleed the brakes is to get a jar or container filled with brake fluid and get a clear hose and submerge one end of the hose in the fluid. attach the other end to the bleeder screw. loosen the bleeder screw. with the master cylinder full, pump the brakes. you will see nothing at first because thats all air. shortly afteq, you will see the fluid flow through. close the valve and proceed to the next wheel. while doing this, keep an eye on the level in the master cylinder. don't let it fall less than halfway down the reservoir otherwise you'll suck in more air. do this twice and you should be fine. on the second pass, about 7 pumps should be fine. if you don't see any air bubbles then your done. don't worry about the very small bubbles. that's probably air entering in at the bleeder screw and the hose meet. by yourself it should take about 30 minutes, with a friend it should take about 15 minutes.

if you hear a hissing noise when you press on the brakes and they go to the floor and your brake performance sucks or is sensitive, then check your brake booster, that part gets overlooked

thats a good idea, i should check my brake booster, my brakes feel a bit spongy, but it might be just air in the lines cause it took me a few days to change the calipers.