1991 Mazda B2200 Series Brake light and Anti-lock light on? Brake pedal pushed to the floor and truck won't stop. Is it the master cylinder and wheel bearing?

Air in lines or bad master cylinder

bleed the whole system back to front..still fade you are getting air somewhere... may have to bleed the master out of the car then put back

check all brake lines and wheel cylinders for leakage. if no leaks its probably the master cylinder. symtoms are-- pedal will sink to floor when stopping or not. or master cylinder leaks from behind "it", and runs down brake booster. if booster goes bad the pedal will be very hard! good-day !

Sounds like it might be your master cylinder that is bad.The seal around the piston inside the master cylinder is allowing fluid past it therefor letting the pedal go to the floor.

Be sure to follow the proper steps to bleed the brakes. Start with a full master cylinder. Have someone in the car pump the brake pedal 3 times and hold it down while you loosen the bleed screw to let the air out. The pedal will go to the floor and must be held down until you tighten the fitting back up. If the brake pedal is let up before you tighten the fitting, it will draw air back into the system. You may have to do this procedure several times on each wheel to get the air out of all 4 lines. Be sure not to let the master cylinder run out of fluid while you are bleeding the lines.

this is an internal issue and the master will need to be replaced. system should be flushed while your at it and bled properly.

adjust your rear shoes up so that the rear drums just turn, with them ajusted to a low setting the brake pedal will be low .
also when you start your engine it is noral for the pedal to drop because of the boster ! [ but not to the floor ]
Bruce Pike

you need to get this check out soon. sounds like a master cylinder problem or if you lucky, it just could be air in the system and a proper bleed job would take care of that.

Replace both clutch slave and master cylinders, and bleed well. I've also had this happen.

The problem may be that the master cylinder needs to be bench bled,there is most likely air trapped in the piston of the master cylinder.The problem comes from the piston not being fully actuated when connected to the pedal assembly.A vacuum bleeder will generally pull it out.