If the brake pedal goes to the floor, first make sure there are no hydraulic leaks in the brake system. Make sure the brake fluid reservoir is full. If it is, chances are the brake master cylinder is bad.
Take a look through this link:
If you find the master cylinder is bad, replacing it isn't too hard of a job. When you get the replacement part, make sure it has a lifetime warranty. That way, you'll never have to pay for it again.
First, here is a link that shows how in general one is replaced. You can use this as a guide.
The new brake master cylinder will need bench bled before install. Here is a video that shows how that is done:
Here are directions specific to your vehicle. The attached pics below correlate with the directions.
Brake Fluid (Remove)
1. Remove the reservoir cap and the brake fluid from the master cylinder reservoir with a syringe.
Brake Master Cylinder
Do not spill brake fluid on the vehicle; it may damage the paint. If brake fluid does contact the paint, wash it off immediately with water.
* Press the brake pedal several times to deplete the vacuum in the brake booster.
* Be careful when handling the master cylinder. Do not hold it at the piston, or the piston may separate from the body. If the piston separates from the body, then the master cylinder must be replaced. Do not reinsert the piston back into the master cylinder body.
* Be careful not to damage or bend the brake lines during removal and installation.
* After removal, plug the ends of the hoses and the joints to prevent spilling brake fluid.
* Make sure not to get any silicone grease on the terminal part of the connectors and switches, especially if you have silicone grease on your hands or gloves.
1. Disconnect the connector (A).
2. Remove the reservoir tank (B).
3. Disconnect the brake lines (A) from the master cylinder (B).
4. Remove the master cylinder from the brake booster (C).
5. Remove the O-ring (D) from the master cylinder.
1. Master Cylinder - Inspection
1. Inspect and note these items:
* Before reassembling, check that all parts are free of dirt and other foreign particles.
* Do not try to disassemble the master cylinder assembly. Replace the master cylinder assembly with a new part if necessary.
* Do not allow dirt or foreign matter to contaminate the brake fluid.
2. If the reservoir tank hose was disconnected, install the reservoir tank (A) and the reservoir tank hose (B) to the subreservoir (C).
NOTE: Align the " " marks (D) on the reservoir tank and sub reservoir with the paint marks (E) on the hose.
1. Brake Master Cylinder
1. Install the new O-ring (A) to the master cylinder.
NOTE: Coat the O-ring with the Shin-Etsu silicone grease (P/N 08798-9013).
2. Install the master cylinder (B) to the brake booster (C).
3. Connect the brake lines (D) to the master cylinder.
4. Install the reservoir tank (A).
5. Connect the connector (B).
I hope this helps. Let me know if you have other questions.
Take care and God Bless,
Images (Click to enlarge)
Friday, March 12th, 2021 AT 10:34 PM