One of the reasons is the brake system loses pressure from an external brake fluid leak.
Abs brake pedal goes to floor.
No brake pressure pedal goes to floor.
The leak may coming from a brake line or one of the brake calipers.
Brake pedals can go down to the floor for various reasons.
Check your brake fluid.
If the brake pedal sinks to the floor only when the abs unit activates then your isolation valves may be the problem.
If the abs unit activates but does not isolate the brake pedal the brake fluid will flow directly into the the accumulator a spring loaded brake fluid container for abs systems.
Low brake fluid level.
Reasons your brake pedal goes to the floor.
If you step on the brake pedal and it has little to no pressure and goes all the way to the floor especially if you re getting no braking.
If you notice your brake pedal is soft you may wonder what part of the brake system causes this issue.
The final reason for a brake pedal to go to the floor is failing axle bearing.
Axle bearings hold the brake rotor true without play while they both rotate.
Technically there are two main causes that would make the brake pedal sink all the way to the floor.
One of the signs that your brake system is not properly functioning is the brake pedal being soft or spongy which means the pedal goes down to the floor when pushed.
1 leak from brake line or brake caliper.
This lets the pedal sink to the floor.
If your brake pedal sinks towards the floor when you are stopped while your foot is on the brake or does not feel as firm when the brakes are applied this could indicate you are having some sort of trouble with.