why does my Toyota Highlander Fourth Generation (2020-present) brake pedal feel soft and goes to the...

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and secure with wheel chocks.
• Wear safety goggles and gloves.

2. Inspect and Replenish Brake Fluid

• Locate the master cylinder reservoir.
• Check fluid level; if low, top up with manufacturer-recommended brake fluid (DOT 3 or DOT 4).
• If the fluid is contaminated (dark or dirty), proceed to flush the system.

3. Brake Line Inspection

• Visually inspect brake lines and hoses for signs of leaks or damage.
• If leaks are found, replace damaged lines or hoses.
• Tighten any loose connections you may find.

4. Bleed the Brakes

• Start with the wheel farthest from the master cylinder (usually the rear passenger side).
• Attach a clear tube to the brake bleeder valve and submerge it in a container of brake fluid.
• Have an assistant pump the brake pedal several times and hold it down.
• Open the bleeder valve to release air and old fluid, then close it before the pedal is released.
• Repeat the process for all wheels in the correct order.
• Recheck the brake fluid level and top off as necessary.

5. Check Brake Booster

• With the engine off, pump the brake pedal several times until it feels firm.
• Hold the pedal down and start the engine; if the pedal drops slightly, the brake booster is functioning properly.
• If the pedal does not drop, inspect the brake booster and check for vacuum leaks.