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I have an 07 envoy. Rear brakes stopped working. mechanic replaced the master cylinder. Kind of worked, not a really hard pedal. 2 week later no rear brakes again. no fluid loss in the mc.
Any suggestion from here.
 

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07 AWD 3SS
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buy this and bleed the brakes, go through 2 of the big brake fluid bottles from your local princess auto (or whatever the auto parts stores up there are lol, I just mention that because zip ties and bias plies on youtube is awesome and he always mentions princess auto) use the thicker foam adapter in the kit that mates to your MC. assuming you have no brake leaks and no brake codes in the EBCM etc


also source an EBCM from car-part.com as a contingency, the EBCMs are SS specific on programming (in terms of brake control) from what I've read on the ol innerwebs. I saw something where you could re-program them to your VIN if you have a hookup at the GM dealership etc but it might not be necessary (never tried it so I can't confirm) ya, those SS specific parts are good to have on the shelf

1-steering rack
2-EBCM
3-B4U ride height sensors
4-accelerometer module under the pass side seat ( I think they are 2WD and AWD specific, also, not sure tho). its for stabilitrak

there are probably more I'm not aware of.?

That stabilitrak actually wears out the rear brakes faster than the front what I've seen on mine if you don't disable it, plenty of info on the whole s-trak system, turning it off with the button on the shifter but it really doesn't turn it all off, etc, stabilitrak vs ETC vs brake torque management vs trans torque management etc
 

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Is there a way to bleed the abs module, separate from the wheel by wheel caliper bleed,?
Yup electronically. I have an autel obd scanner that can cycle the abs motors for 5 sec at a time for bleeding purposes. Cost me $135. Most any dealer or repair shops have similar more fancy units that do the same
 
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