I have a problem on my 02 Silverado that I can not figure out.
The pedal will be fine for a bout a day or two and then for some reason at random it will just go to the floor and nothing. If i pump them up they will eventually get better but a day or so later it will be right back to where it was with the brakes going to the floor. So far I have replaced the power booster, the master cylinder and bleed the brakes many times.
I am confused as to what it might be and any help would be great thanks.

 

Anyone out there with this problem or have any ideas on what it might be?

 

I would check the bqnjo bolts going into the calipers. There may be air getting in.
I think there should also be crush washers, 1 on either side of the brake line, try replacing the crush washers.

 

hoses could be dryrotted and letting air come inside, bleeder screw not fully sealing. caliper letting air in slowly. something

 

I cant seem to find anything wrong with the brake system whatsoever and I am gettin confused and a little lost.

 

have you replaced the calipers? if yes the washers that come with them can be gabage, look for leakage at the wheel cyls

 

Dont rule out the possibility of getting a bad M Cyl. I went thru three on a job one time.