brake warning light on

9 times out of 10 you will need front brakes because the fluid goes into the caliper to make up the worn pads here is guide to help you see what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

Please let us know what you find.

Cheers

Yep, the pads were all the down I followed the great guide you sent and got them done in an afternoon :)

Brakes problem
1992 Chevy Blazer 6 cyl Four Wheel Drive Automatic 180000 miles

the master clynder was replaced brakes were bleed but anti brake light and parking brake light stays on dash brakes are good when master went bad peddle went to floor and lights came on ?

sometimes is hard to get those lights out, try rebleeding the entire brake system in the correct order and see if the lights go out then. also check for a leaky brake line, often leaky brake lines will cause the master cylinder to go bad in the first place..

Brakes problem
2001 Chevy Blazer 6 cyl Four Wheel Drive Automatic 130000 miles

Have a Innova 3160 obd 11 scanner ABS/ brake scanner all one unit won't give me a code. sensors to each caliper on all 4 wheels look fine. replaced front wheel bearings were bad. Any ideas. Brake Control Module?

check all your fuses and make sure they are ok. I would stop at your local dealer or shop and see if they can communicate with the ABS module