05 Prius Brake problem

Overdue for brake fluid flush?

 

You need to grease the glide pins on the calipers

 

Check the rear drum brakes are operating too. Just raise the back, make sure wheels spin near-free, and that both sides lock when brakes are applied.

I'm thinking the caliper leaked because there's rust flakes or whatever in the lines, jamming, preventing good seal.

 

Are you sure you know what you are doing?
What about the rotor? Did you resurface or replace?

Do you have Techstream to flush the brake lines?

Just subscribe to Toyota TIS, and get a temporary subscription so youncan get the factory manual. $15 for a two business day subscription.

 

With third gen you can flush without techstream, using "invalid mode". Not sure about second gen though. I'm thinking dealership time. Still, if you're persevering here's a relevant thread:

Problem with rear brakes...No pressure when bleeding | PriusChat

And:

Replacing brake fluid and bleeding brakes on a GEN II Prius without Techstream | PriusChat

 

Gen2 Prius requires Techstream to bleed brakes, esp the rears.

There was one ingenious person who figured a way to do it w/o, but the process he discovered was a major PITA. No one in their right mind would want to follow in his foot steps. Given how cheap the hacked copies of Techstream is, and how invaluable it is, I am still amazed some people don't want to get it. Obviously a laptop is required. But laptops are plentiful and cheap.