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Brake Pedal Goes to Floor

Brake pedal goes to floor is a result of a problem on master cylinder, specifically the brake master cylinder has leak or is leaking.

If brake fluid is leaking from a pipe or hose, fluid pressure will not be transmitted to the wheel cylinders/disc brake cylinders, resulting in an extremely dangerous situation where the breaks loose their effectiveness.

Brake pedal goes to floor because of the following

(1) Internal leak on master cylinder

Car troubleshooting

If brake pedal goes to floor when the brake is applied, it usually means that there is a leak on the master cylinder. Master cylinder consists of a primary and secondary pistons which operates on either the front or rear brakes. Both pistons is sealed with a component called “cup” when the brake pedal goes to floor the most likely to happen is that the primary cup that seals the primary piston is leaking brake fluid even when brake is lightly applied.

The master cylinder converts the motion of the brake pedal into hydraulic pressure. It consists of the reservoir tank, which contains the brake fluid, as well as the piston and cylinder, which generate the hydraulic pressure. The tandem master cylinder has two independent hydraulic lines. If either of the lines is malfunctioning, the other line is still capable of functioning.

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What to do?
In case fluid leakage due to piston cup wear occurred, overhaul the master cylinder or you need to replace the master cylinder. There is available rebuilt cylinder if you want a cheaper master cylinder. For safety purposes never drive the car instead have the car towed to the nearest reputable shop that specialized in brake repair. Have a mechanic inspect the brake system, explain to the mechanic what you think is the problem and ask to check the cylinder to confirm your findings.

If you do the repair yourself refer to your shop manual of your car model, be careful not to splash brake fluid on a painted area because it may cause damage to the paint. If brake fluid is splashed on a painted area, immediately wash it away with water. Never use mineral oil such as kerosene or gasoline while cleaning and assembling.

Make sure that there are no foreign materials on the cylinder wall, piston or cup seal. Be careful not to scratch the parts with a tool while assembling.

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