If the reservoir is empty or the brake fluid level is low there is most likely a leak somewhere in the brake system.
Brake pedal to the floor sometimes.
A brake pedal that feels mushy spongy or that slowly sinks to the floor when depressed can be best described as brake pedal sink.
Pressure on the brake fluid cases the brakes to be applied to the wheels.
Another common reason why your brake pedal may go down to the floor is because you are running low on brake fluid.
I cannot get the bleeder plug out so the air in.
I just today replaced all rotors and rear pads on my 01 silverado.
One of the reasons is the brake system loses pressure from an external brake fluid leak.
The first thought that comes to anyone s mind when brake pedal goes to the floor when engine running is that there is a leakage in any of the brake lines that outflow the pressure in the brake system the first thing you require is to check the brake fluid level.
Mar 26 2012 1 56am.
I have taken it to several mechanics for this problem and we have changed the master cylinder rebuilt the booster and machined the discs and replaced the pads.
Brake lines brake calipers check.
Brake pedal goes to floor troubleshoot fix in under 45 minutes check for brake fluid leak.
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.
They will sometimes leak fluid into the power brake booster but not always.
Here s an additional reason a brake pedal could go all the way to the floor.
It does not always happen.
A bad brake booster.
Brake pedal going to the floor but no fluid leak.
If it is full capacity then there is no leak.
The leak may coming from a brake line or one of the brake calipers.
I did disconnect the fluid line on the front caliper and the fluid drained out.
1 leak from brake line or brake caliper.
The most common reason this happens is because you have a leak in one of your lines.
Technically there are two main causes that would make the brake pedal sink all the way to the floor.
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.
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.