Breaks Go To The Floor

I replaced the master cylinder new and a week later i had to lock up the emergency brake to keep my grand kids from harm by sliding through the intersection.
Breaks go to the floor. One of the more common causes for the brake pedal going to the floor is a loss of brake fluid. This is pretty easy to diagnose. When you re out of brake fluid your brakes simply won t work. The leak may coming from a brake line or one of the brake calipers on your vehicle.
Also brake pedals tend to go to the floor when there is air in the line and they need to be bled but this only happens when the pedal is depressed. Technically there are two main causes that would make the brake pedal sink all the way to the floor. Axle bearings hold the brake rotor true without play while they both rotate. The final reason for a brake pedal to go to the floor is failing axle bearing.
1 leak from brake line or brake caliper. If this bearing goes bad it will allow the brake rotor it move back and fourth which pushes the caliper piston back into the caliper creating an air gap. The first thing to check when your brake pedal goes to floor is to raise the hood and check the brake master cylinder s reservoir. One of the reasons is the brake system loses pressure from an external brake fluid leak.
You should be able to see brake fluid underneath the car if there s a leak in the system. I had the brake pedal go to the floor with my grand kids in the truck with me. Check the backside of each tire. If the reservoir is empty or the brake fluid level is low there is most likely a leak somewhere in the brake system.