Brake Pedal Goes To Floor When Engine Running [Fix]

One of the worst moments you can see is when the engine is running at high speed when the brake pedal is pressed, and then the brake pedal goes to the floor. This situation should not only be called bad but also extremely dangerous. So we are being discouraged from driving if the brakes do not work effectively.

If you ever notice that the brakes have gotten a weird sound and are starting to weaken, you need to make sure the vehicle is inspected as soon as possible. This article will tell you how to fix full power brakes and why we can keep spongy brake pedals while the engine is running.

The reason the brake pedal goes to floor when engine running

Technically speaking, there are only two main reasons why your brake paddles go all the way to the floor: faulty master cylinders and brake fluid leaks. But there are other reasons and things you need to be aware of. However, only if these two main causes are not to blame, and let’s discuss them one by one.

1. Brake line or brake caliper leak

Brake calipers or brake fluid leaks from brake fluid lines are a common cause of loss of brake power. The braking system should provide adequate braking power when needed, so the design should have a good amount of brake fluid.

The piston in the brake cylinder is compressed by the pressure of your foot on the brake pedal. And this compression will increase the pressure on the brake line and even induce the brake fluid to go into the brake caliper. However, due to the high pressure of this brake fluid, the brake pads will press and move to the brake rotor.

This will cause the car to stop due to the friction between these components. However, there will be no pressure on the brake pedal if there is any leakage in the brake line. So, if you put your foot in it, it will go straight to the floor without you feeling anything.

Since you are always stepping on the brakes while driving your car, you must have enough brake fluid in your system to apply the brakes whenever needed.

2. Malfunctioning master cylinder

If the master cylinder does not work properly and the master cylinder increases the brake fluid pressure, the braking force may deteriorate or decrease. The brake pedals go to the floor, but still, they can never work or even stop. Moreover, any defective master cylinder brake fluid will allow the seals to bypass internally.

If you see no problem with the braking system, you can push the brake pedal connected with the master cylinder using push. Also to activate the brakes by producing hydraulic pressure on these cylinder wheels. Again it only presses the brake fluid on four wheels.

The cylinders should therefore be completely sealed so that they can maintain the required braking pressure or strength. And it has a rubber seal on the master cylinder to protect the brake fluid from leakage. If these seals are damaged, worn out, or already old, they allow the brake fluid to survive. And after this happens, your car will lose braking power, and you will have a spongy brake pedal.

3. Brake line air

Some drivers have noticed this problem: the brake pedals sometimes go to the floor after replacing their master cylinders in the car. This usually occurs when the air does not bleed even after installing a new master cylinder. And for this, there will still be some air present if the air from the cylinder is not bleeding.

This air then obstructs the flow of brake fluid inside the brake line and gives the brake pedal a feeling of flexibility instead of firmness. This condition creates the possibility of damage to the brake line.

4. Bad booster

If you see that the brake booster is not working properly now, it may be due to the spongy condition of your brake pedal. The effectiveness of this brake booster will provide braking power while you will not only frustrate your brake pedal.

Otherwise, you don’t have to put too much pressure on the brake pedal if it is in good condition to stop your car. This braking system component is usually located between the master cylinder and the brake pedal, finally connected to the engine.

Almost all of them have a vacuum line system to overcome the fluid pressure coming from the braking system. But if you notice that your stopping distance has increased, assume that it is due to a faulty brake booster culprit. To get your car to stop normally, you don’t need to add enough power from the brake booster.

5. Your driving style

The reason your brake pedals go to the floor may be because of your driving style whenever you drive. It will only quickly become brake fluid the more you use your brakes. This will affect its designed concentration if the brake fluid is always hot.

In other words, it can become thinner. However, the thinner a brake fluid is, the less efficient it will be in applying the required braking pressure. More pressure or force may be required to provide the necessary braking power to the brake pads.

Thus, the braking system of your car is not always able to provide the necessary power. Braking power will be lacking even if you keep the brake pedal on the floor (braking will also cause this condition). I have noticed in some cases that forgetting to leave the parking brake is a reason.

6. Lack of brake fluid

You need to check in your car the brake fluid level or fluid plastic cans for brake cancer. It tends to be a daily chore of every motorist. So if there is not enough brake fluid in this container, then the braking power will be reduced.

So keep an eye on why the brake pedal goes to the floor while the engine is running, why the brake pedal goes to bed, but the car stops. Next, take a look at fixing and checking the sponge or soft brake pedal while your vehicle is running.

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The solution of brake pedal goes to floor when engine running

Thanks, the brake pedal is not so difficult to solve the problem of getting on the floor all the time or sometimes. The reason is that there are not many variables and correctly pointing out this problem is the key to the solution!

1. Check the brake fluid level in the cans

This should be your first test, as the most common cause of this problem is leaking in the brake lines. Check the brake fluid level in its plastic container again and if the story is less than normal? However, the leak is located somewhere.

2. Check the brake lines

Next, you should check the brake calipers and the brake line. Look for any residue of oil on the four wheels of the car and any one of them. And to see it or to do it, you may have to separate the tires. Then look for brake fluid lines to see if they have any cuts or holes.

Note that this could leak if there are any signs of oil or oil residue on a line. Or, if the fresh brake fluid is present and any brake fluid line is damaged, replace it. Otherwise, try to have it replaced by a certified car mechanic.

3. Check the brake calipers

Check the brake calipers of each cycle by removing the wheels to reveal the brake calipers. Notice for fluid residue or new brake fluid and bleeding screws around the calipers.

If you are new to car repair, you should ask a certified car mechanic to inspect and replace or repair parts.

4. Check the brake master cylinder

The next thing is to check the brake master cylinder. While this is only a job for an experienced mechanic, you need to know ​​how to good mind.

The oil seals in this cylinder will prevent your brake fluid from escaping. Over time, this brake fluid leaks, and the seals become tired. Then it should be replaced by a new cylinder unit for you. However, we do not recommend replacing it with a reconstruction unit because it is an important part of your car’s braking system.

If you find any signs of leaks or faults in the car’s braking system, you should not run it. In that case, you need to fix it first and if you can’t make the necessary repairs, then ask the help of a certified mechanic because he has all the tools, skills, and knowledge he needs to do this job properly.

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FAQ: Brake pedal goes to floor when engine running

Q. Why do I lose brake pressure when I start my car?

You can lose brake pressure after starting your car if you leak any of the brake components. If there is no leak, the brake pedal goes to the floor; this problem may be related to the brake booster, which leaks the vacuum.

Q. How do I know if my brake booster or master cylinder is bad?

There are many ways to detect a brake booster or bad master cylinder. So only you can feel the brakes are too soft or too spongy under your feet, and there is a leak in the master cylinder. You may also notice that the engine is stalling or the brake pedal is pressing hard and stops working when braking. These will be signs of a bad master cylinder and brake booster.

Q. Why does my brake pedal go to the floor after bleeding?

To keep the pressure on the brake brakes again and after the air from the brake fluid bleeds, you must put some stiff pressure on the brakes.

Q. Should the brakes be driven with the engine running?

Should the brakes bleed when the engine is off? To find out, be sure to watch the YouTube video:

Q. What causes hard brake pedals?

A hard brake pedal always means the brake breaker can have a problem. But if you use vacuum air from this brake booster engine, it will help to press the brake master cylinder.

Final word: Brake pedal goes to floor when engine running

We know that simply determining the right problem is the best way to solve this problem. Then if you find yourself confused while working, take the vehicle to a specialist for inspection. And always keep in mind that the brakes are related to those who use them, and any defects are associated with the vehicle’s safety. So, do the repairs properly and try to change the brake fluid at regular intervals to keep your car’s brake system in good condition.

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