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Hi, I have a 2002 Trailblazer and changed all the calipers, all rubber brake hoses and the master cylinder. The brakes will not bleed?? Ihave a good Autel Maxi scanner and also bled the abs....still will not get a brake pedal. I pulled the vac hose off the booster and it got rock hard so, booster is good. Is there a secret to bleeding these brakes?? I'm at a complete loss....I never had brakes that gave me this much trouble. Any advice will be MUCH appreciated. Thanks, Gene yea, I'm not having a good day! lol
 

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I'm not sure about our trucks, but on some vehicles it is possible to install the caliper upside down, and then you can't get the air out of the system. This didn't accidentally happen, did it? The bleeder screw must always be at the top of the caliper.
(I guess a better way to put it would be accidentally swapping a caliper left side for right side.)
 
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