I just changed my master cylinder and bled all my lines. only one of them (left rear) had a lot of air coming out of them. the pedal is nice and firm, but only after it's traveled about and inch and a half further than it used to. did i set the master cylinder wrong? do i need to bleed them again?

 

sounds like there is still air in there

 

With replacing a master cylinder, I usually bench bleed the master. This purges the master completely of air and makes it easier to bleed the rest of the car. If you didn't do that, you are going to have to bleed your brakes about 3 times as much as you would had the master been bench bled. Just go ahead and bleed them all a couple more times (do a count of 20 for each caliper in an X rotation).

Chris

 

When you change master cylinder, you need to bleed all 4 and in sequence to properly bleed all the air out.
Start from pass rear, then drivers rear, then pass. front then last drivers front.

 

that's what i did. but the pass rear didn't spit out much air even after going through most of a bottle of fluid...

 

how are you bleeding???

Perhaps you are loosening the tap too far??? or not submerging the end of the hose and sucking air back in when you let up on the pedal.

I suggest you use two people next time, one to pump the pedal, and one to tighten off the tap and to monitor the fluid output.

Only loosen the tap enough to get it flowing when the pedal is pressed. No more than 1/2 to 3/4 of a turn. And very very slow on both pressing and lifting of the brake pedal.