Q: How to inspect and replace brake hoses and lines on Toyota Sienna?
A: About every six months, with the vehicle raised and supported securely on jack stands, inspect the rubber hoses connecting the steel brake lines with the front and rear brake assemblies for cracks, chafing, leaks, blisters, and other damage, as these are crucial parts of the brake system. If any hose shows signs of wear, replace it with a new one. To replace the front brake hose, loosen the wheel lug nuts, raise the vehicle, and remove the wheel. Unscrew the brake line fitting from the hose using a flare-nut wrench to avoid rounding off the corners, then remove the U-clip from the female fitting at the bracket and pass the hose through. At the caliper end, remove the banjo fitting bolt and separate the hose from the caliper, ensuring to replace the two copper sealing washers during installation. Remove the U-clip from the strut bracket and feed the hose through. For installation, pass the caliper fitting end through the strut bracket, connect it to the caliper with the banjo bolt and copper washers, ensuring the locating lug is engaged, then tighten the bolt to the specified torque. Push the metal support into the strut bracket and install the U-clip, ensuring the hose isn't twisted. Route the hose into the frame bracket, connect the brake line fitting, and tighten securely. After bleeding the caliper, install the wheel and lug nuts, lower the vehicle, and tighten the lug nuts to the specified torque. For the rear brake hose, repeat the removal and installation steps, ensuring to bleed the wheel cylinder afterward. When replacing metal brake lines, use the correct parts, avoiding copper tubing, and purchase genuine steel brake lines. Prefabricated brake lines with flared ends and installed fittings are available at auto parts stores. Ensure the new line is securely supported and has clearance from moving or hot components. After installation, check the master cylinder fluid level, add fluid as necessary, bleed the brake system, and test the brakes carefully before driving.