Brakes not working

Hi and thanks for using 2CarPros.com.

There are a few things that can cause the brake pedal to hit the floor. Things such as low brake fluid, a broken brake line or hose, a bad wheel cylinder or brake caliper, or a faulty master cylinder.

First, make sure the brake fluid in the master cylinder reservoir is full. If it is empty, refill it with the proper brake fluid and check for leaks. Have a helper pump the brakes while you watch under the car for where a leak may be located.

If the master cylinder is not empty, but instead is full of brake fluid, suspect a faulty master cylinder.

Take a look through this link. It discusses in more detail causes of this type of problem.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

If you determine that the problem is the master cylinder, here are the directions for replacing it. Picture 1 correlates with these directions.

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REPLACING MASTER CYLINDER ASSEMBLY
Removing Master Cylinder Assembly

NOTE:
Install all new components included in the repair kit used to service this master cylinder.

Lubricate rubber parts with clean brake fluid to ease assembly. Do not use lubricated compressed air on brake parts as damage to rubber components may result.

If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the brake system.

The fastener tighetening specificatons are for dry, unlubricated fasteners.

Perform service operations on a clean bench, free from all mineral oil materials.

REMOVE OR DISCONNECT
1. Battery.
2. Air box.
3. Perform gear tension release procedure. See: Antilock Brakes / Traction Control Systems > Testing and Inspection

4. Electrical connector to fluid level switch.
5. Electrical connectors from ABS both solenoids.
6. 3-pin and 6-pin motor pack electrical connectors.
7. Brake pipe tube nuts from master cylinder and modulator assembly. Plug open brake pipes to prevent brake fluid loss and contamination.
8. Master cylinder mounting nuts.
9. Master cylinder and modulator assembly from booster.

INSTALL OR CONNECT
1. Master cylinder and modulator assembly to power booster assembly. Tighten master cylinder and modulator assembly mounting nuts to 27 Nm (20 ft. lbs.).
2. Brake pipes tube nuts to master cylinder and modulator assembly. Tighten brake pipe tube nuts to 23 Nm (17 ft. lbs.).
3. Electrical connector to fluid level switch.
4. Electrical connectors from both solenoids.
5. 3-pin and 6-pin motor pack electrical connectors.
6. Fill master cylinder to proper level with clean brake fluid.
7. Bleed hydraulic system. See: Hydraulic System, Brakes > Procedures
8. Battery.
9. Air box.
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Here is a link that shows how to replace one in general. It may help in the process.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Let me know if this helps or if you have other questions.

Take care,
Joe