So I changed all four pads. For the rears, I opened the bleeder when pushing the piston back in, squirting brake fluid out. For the fronts I did not.

Now when I go to bleed the brakes, by having someone pump the brake pedal up and me open the rear bleeders, nothing comes out, and the pedal doesn't move. If I do the front it bleeds normal. I tried leaving the bleeder in the rear open, with it hooked up to the bottle half filled with brake fluid and pumping the brakes, and nothing got sucked in or pushed out.

Any ideas?

 

Did you leave the ignition on the ON position (without engine running)?

 

Ok I just put it ON position and that did the trick. But the pedal still feels spongy. I'm guessing I need to have the dealer bleed the ABS mechanism??

 

The brakes are spongy as its not a standard master-cylinder design, but if you think you got air into the ABS actuator system you need to either get your hands on a Toyota ABS check tool, part no 09990-00150 with the correct cable (google it), it does cost ~$500, or just bring it to a Lexus dealer

 

Why did you bleed?

There's no need to do so for changing pads; just push the calipers in.

 

I believe it is recommended every 2 years or 24,000 miles

 

i have never heard of that

 

Brake and steering fluid are probably the two fluids that people neglect the most. Over time, the fluids break down and moisture can enter the system. If the water vapor evaporates into air, you'll have air in your line or MC. Nothing lasts forever on our car, especially fluids.

 

How spongy is it?

A stock GS definitely feels spongy. Just as long as you dont have to put your pedal to the floor just to get some braking power, I think you're fine. My car still has that spongy feel, despite changing the pads. The problem is our calipers. By changing that alone (upgrade to supra or aftermarket calipers), you'll notice a big difference in pedal feel. I'm going to do a caliper swap soon because I also hate the stock feel.