1998 Chevy S10 Blazer - Brake Replacement

I am slightly confused by your post.

What is the air that you hear when you pump the pedal? Is it like the normal sound when you push the pedal (slightly fluid squishing sound) or just the spring and pedal movement sound?

There shouldn't be air going from the pedal you push to the air intake. As I understand it your power brakes are vacuum assisted by the engine but that is separate from the hydrolic system that you bleed the air out of.

It is normal for brakes to require adjusting after replacing the pads. If you only replaced the pads, you should not need to bleed them. You should have compressed the cylinders to get your new pads to fit over the disk, one or two pumps should return the pistons to the disk.

Usually even if you have air in your lines, you can build up some pressure by pumping the pedal from full release all the way to the floor. If you still cannot build up any pressure, check the level in your resivior if it has dropped, start looking for the leak. It is possible that the flexible line that goes to your caliper has cracked or ruptured and is leaking the pressure you are trying to build.

This is only my opinion, if this doesn't help, I am certain one of the experts will chime in with better advise.

Good luck,

Drew

Your booster seal is torn, letting the diaphragm air come back down the pedal shaft. Simply, if you push the pedal down to far it will tear the rubber. I use wood blocks under the pedal to prevent the long travel. If it went to the floor...... Sorry.

Ray, your answer looks real good, but if the pedal is still going to the floor, could the piston in the master cylinder be stuck all the way in?

My '90 Ranger brake pedal is going back to living near the floor again, I guess I have to adjust the rear wheels again. The automatic adjusters just don't last, I swear I've replaced them recently, star wheels and all. Luckily flooring it doesn't blow the diaphragm in this model.

Had to replace the master cylinder a while back. It had rusted inside past any honing repair. Go figure. Who would expect to have to purge brake lines to remove water buildup in the master cylinder. That is more than just a casual bleeding.

Ford has a firewall modification for F150 and ranger. Check and see if the firewall (at the pedal mount) is separated. First time I saw it I couldn't beieve it. The sheet metal magnifies the problem. I hate star wheels, too.

Weird, that happened to my Karman 30 years ago. You are right. I'm goin out to look at my S-10 right now. Just wondering if the MS is aluminum. The Firewall comment was the truth.

"Changed" front brakes. What exactly did you change?

HAVE A 98 BLAZER THAT I HAD SOME PROBLEMS WITH BRAKES,HAD TO GET A GUY WHO WORKED AT CHEVY DEALERSHIP TO HOOK UP TO COMPUTER TO RESET SOMETHING,FOUND A WHEEL SPEED SENSOR BAD AND REPLACED IT AND CLEARED CODES AND WORKS OK NOW