Technically there are two main causes that would make the brake pedal sink all the way to the floor.
Why does my brake pedal go to the floor after changing pads.
Here s an additional reason a brake pedal could go all the way to the floor.
The brake system in your car is a sealed hydraulic system and relies on close tolerances between the brake pads and rotors or the brake shoes and drums.
1 leak from brake line or brake caliper.
If the brake shoes are worn the air gap between the shoe and the drum will be enlarged making the brake pedal travel downward beyond its normal throw.
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.
When you are ready to leave for work after your car has sat for a prolonged period of time check the ground underneath your car for puddles.
No brake pressure pedal goes to floor.
One of the reasons is the brake system loses pressure from an external brake fluid leak.
Check out these three tips for dealing with a soft brake pedal as safely as.
Normal after the brake change you need to make sure the brake fluid is just above the max full level with the engine running apply the brakes peddle fully to the floor 5 to 10 times to reset the pistons in the callipers.
If it s low top it off to the mark on the side of the reservoir.
Also if a leak occurs in the system it will be unable to build pressure due to the lack of fluid causing the brake peddle to travel to the floor which can be followed by the brake system.
In case your car has a drum brake system after the above most common reasons for brake pedal goes to floor check your car s rear brake shoes.
The leak may coming from a brake line or one of the brake calipers.
The most common reason this happens is because you have a leak in one of your lines.
Check your brake fluid.
Reasons your brake pedal goes to the floor.
Low brake fluid level.
Another common reason why your brake pedal may go down to the floor is because you are running low on brake fluid.
A bad brake booster.
Pistons are push all the way back when you change the pads.
A brake pedal that feels mushy spongy or that slowly sinks to the floor when depressed can be best described as brake pedal sink.
Also known as spongy brakes this brake pedal feel is almost always an indication of a problem with your vehicle s brake fluid system and it has several potential causes.
If your master cylinder doesn t work properly or only works sometimes you re going to lose braking power and occasionally your brake pedal will go all the way to the floor.
