06 Sequoia rear brakes not working.

[AlrightGuy]

2006 Sequoia Limited, 4 wheel discs, factory rear air ride. Brake pedal just got soft one day and I found the rears weren't working. With the rear tires off the ground the brakes will hold at idle, nothing more. Rear pads were replace about a year before this started. So far I have replaced FL caliper (found one piston frozen), front pads, flushed brake fluid. Today I found that with the rear brake line port on the master cylinder plugged the pedal was still soft/mushy so I put on a new master cylinder. Still no rear brakes. What the hell am I missing?

 

[Fishnbeer]

Well if you put a plug on the m/c port and still have a soft pedal, then it sounds like you got a bad m/c. That eliminates everything else in the circuit, so long as you made sure the m/c is well bled, like doing a "bench bleed" but still on the car.

Couple questions though, what method did you use to bleed the rear brakes? Did you use a vacuum or pressure bleeder? Or have someone step on pedal while cracking the lines? And what did the fluid look like coming out? If you already had a stuck caliper piston you probably got some nasty stuff in the fluid...

 

[AlrightGuy]

I bench bled the new MC. The old fluid was dark, that's why I flushed. The method was pumping the pedal through the bleeders.

 

[Cryptictoy]

If this has the abs pump on it you may have cracking the bleeder and turn ignition on and it will pump fluid ,