If Your Brake Pedal Suddenly Sinks To The Floor

if your brake pedal suddenly sinks to the floor


If your brake pedal suddenly sinks to the floor, In that case, you’ve got a serious problem on your hands. Nobody wants to find themselves in an uncomfortable situation where their brakes fail. 

Brinks that sink to the ground is an indication that your brakes aren’t strong enough to stop your vehicle, which is very dangerous. This would cause most people to panic and freak out. If your brake pedal suddenly sinks to the floor while you’re studying for your DMV written test, you may not know what to do. Here’s what you need to know.

Brake Pedal Suddenly Sinks To The Floor

You should shift into a lower gear and pump your brakes if your brake pedal suddenly sinks to the floor. This is the best course of action for you in such a situation. The car should not be turned off, put into higher gear, or put into neutral. Whenever your brake fails, shift into a lower gear and pump the brakes. You should know what to do if your car brakes fail. 

This is because when you pump your brakes, you’ll be able to build up enough pressure to stop your vehicle. Until the brakes are fixed, don’t drive the car again once you can stop it. The car may need to be towed to the mechanic by a tow truck.

What would cause my brake pedal to go to the floor?

if your brake pedal suddenly sinks to the floor

You can cause your brakes to sink by letting your brake fluid run low. A spongy pedal may be caused by low fluid levels or air getting into the brake line. A bad brake booster is another reason a pedal won’t work.

What are some of the symptoms of a faulty brake booster?

  1. A brake warning light is displayed on the console.
  2. There is fluid leakage in the brake system.   
  3. The brakes are too hard.
  4. Spongy brakes or sinking pedals
  5. lead to misfiring or stalling when you apply the brakes.

What are the symptoms of a bad master cylinder?

In some cases, brakes may feel fine for a moment, but then lose braking power the next. The pedal can feel firm, but not stable when there is fluid leaking from the cylinder. When this happens, it sinks toward the floor and feels spongy.

Is it possible for a master cylinder to fail without leaking?

Occasionally, brake lines leak at the threaded ends, which screw into the master cylinder. Check the brake lines for visible leaks, then ask a mechanic or a helper to inspect them from the brake fluid reservoir to the calipers after the fluid has been drained. Using a flashlight may be necessary.

Is it possible to drive a car with a bad master cylinder?

It is possible for brake fluid to leak from a faulty brake master cylinder. It is possible that the brake pedal will sink to the ground and you will not be able to brake. If this happens, you must use the brakes.

What are the signs that my master cylinder has a leak internally?

An internal leak may be exhibited by symptoms such as a sinking brake pedal, spongy brake pedal, or dragging or pulling of the brakes. In the event of a leak or if you receive a check engine or warning message, you may need to check your brake master cylinder.

What is the cost of fixing a master cylinder?

Typically, it costs between $320 and $500 to replace a master cylinder. The cost of parts is between $100 and $210, and labor is between $230 and $300.

Is it possible to repair the master cylinder?

Usually, brake master cylinders are repaired by replacing a leaky seal. The brake master cylinder needs to be replaced if it has worn out over time. It is a simple repair that can be performed, but details may vary depending on the make and model of your vehicle.

What You Should Know About Brakes

In order for your vehicle to start and stop, it must be able to do so. It is known as a brake pedal sink if your brake pedal feels mushy or spongy when you press the brake pedal. When your brake pedal is stationary, it may sink to the ground. Whenever you apply the brakes, if the pedal does not feel firm, then this may be an indication that your brakes are in trouble.

There are different types of brakes

Brake systems can be either drum brakes or disc brakes. Each vehicle has a different brake pedal sink depending on which type of brake system it has.

Components of brakes

A disc brake consists of a disc, or rotor, and a caliper assembly. Several types of hardware are used to mount brakes on vehicles, including brake pads, wheel bearings, and other components. Brake fluid is pushed through tubes, pipes, and valves from the master cylinder to the calipers.

System for drum brakes

The drum brake system consists of brake shoes, hydraulic wheel cylinders, and a drum. As the brake pedal is pressed, the rotating drum’s brake drum forces the shoes against the inner surface.

In most cases, the brake pedal sink is caused by a leaky master cylinder, brake fluid leak, or ABS unit leak.

Most modern vehicles have a Master Cylinder, which is the main pump that pushes brake fluid through the lines. In this way, the brake pads are pressed against the wheels by the brake calipers. 

Master Cylinder Replacement Signs

A cylinder’s seals may wear out over time and develop leaks inside. In particular, contaminated brake fluid may lead to leaks. Contaminated brake fluid is frequently black or dark brown. These symptoms may indicate that a master cylinder needs to be replaced:

  • The brake pressure on the vehicle does not hold as well as it should. The brake pedal sinks as a result.
  • Keeping your foot on the brake pedal is easy when you come to a halt.
  • For your car not to creep ahead, you must pump.
  • It is also possible that it does not light up when you pump the brakes.

Issues with brake fluid

The hydraulic fluid used in a vehicle’s brake system is brake fluid. Flows through the brake lines and can be compressed. Each rotor on the vehicle is loaded with this fluid when the brake pedal is pressed. High pressure and temperatures can be handled by this fluid. You couldn’t stop your car without brake fluid. Having the brake pedal sink indicates that the brake fluid is not working properly.

The light showing when the brakes are applied (like an exclamation mark within a circle enclosed by parenthesis)

  • Wet spots around hose and line connections can be identified.
  • Leakage of brake fluid from the drum brake caliper or drum wheel cylinder.
  • Brembo brake lines, hoses, calipers, or wheel cylinders may be leaking.

You can check : What Is Needed For Steering Control On a Pwc


There are always brake failures or if your brake pedal suddenly sinks to the floor you should first. When you notice any issues with your vehicle, such as a weak brake, fluid leaks, etc., it is best to have your car inspected by a mechanic. Getting your brakes looked at as soon as possible is the best way to avoid driving with bad brakes.

2 thoughts on “If Your Brake Pedal Suddenly Sinks To The Floor”

Leave a Comment