why does the brake pedal feel soft in my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Check Brake Fluid Level

• Open the hood and locate the master cylinder.
• Remove the cap and check the fluid level; add DOT 3 or DOT 4 brake fluid if low.
• Inspect the fluid for contamination (e.g., discoloration).

3. Inspect and Repair Leaks

• Visually inspect brake lines, fittings, and the master cylinder for leaks.
• If any leaks are found, replace the damaged section of the brake line or component.
• Tighten any loose fittings as needed.

4. Bleed the Brake System

• Begin with the furthest wheel from the master cylinder (usually the passenger rear).
• Attach a clear hose to the bleeder valve and submerge it in a container of brake fluid.
• Have an assistant pump the brake pedal several times, then hold it down.
• Open the bleeder valve to release air and fluid, then close it before the assistant releases the brake.
• Repeat this process for all four wheels, ensuring no air is present until clear fluid comes out.

5. Inspect and Replace Brake Pads/Rotors (if necessary)

• Remove the wheel and inspect the brake pads and rotors for wear.
• If pads are worn beyond specifications (usually less than 3mm), replace them.
• If rotors are scored or warped, replace or resurface them according to manufacturer specifications.