why does my Toyota Corolla E170 (2013-2019) brake pedal feel soft and goes to the floor

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

538 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a soft brake pedal issue in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on the braking system.
•Ensure the vehicle is securely lifted and supported before removing wheels.

Symptoms

•Soft brake pedal feel
•Brake pedal travels to the floor
•Reduced braking performance
•Warning light on the dashboard (if equipped)
•Possible brake fluid leakage under the vehicle
•Increased stopping distance

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks on brake lines, calipers, and master cylinder.
3
Examine brake pads and rotors for wear or damage.
4
Perform a brake fluid pressure test using a pressure gauge.
5
Scan vehicle for any related error codes using an OBD-II scanner.
6
Inspect the brake booster for proper operation and vacuum leaks.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Brake bleeder kit
•Wrenches
•Socket set
•Torque wrench
•Brake line wrench
•Funnel
•Container for old fluid

Parts Required

•Brake fluid
•Brake pads (if worn)
•Brake rotors (if damaged)
•Brake lines (if leaking)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks on brake lines, calipers, and master cylinder.
3
Examine brake pads and rotors for wear or damage.
4
Perform a brake fluid pressure test using a pressure gauge.
5
Scan vehicle for any related error codes using an OBD-II scanner.
6
Inspect the brake booster for proper operation and vacuum leaks.

Solution

1. Preparation

Gather tools and parts required for the repair.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Brake Fluid

Tools Required: Brake fluid, funnel, container for old fluid.
Remove the master cylinder reservoir cap and inspect fluid condition.
If fluid is low or contaminated, siphon out old fluid and replace with new brake fluid per manufacturer's specifications.
Reinstall the master cylinder cap securely.

3. Inspect and Repair Brake Lines

Tools Required: Wrenches, brake line wrench, brake line replacement (if needed).
Visually inspect all brake lines for signs of corrosion or damage.
Tighten any loose fittings and replace any damaged sections of brake lines.
Use a brake line wrench to avoid stripping fittings.

4. Bleed the Brakes

Tools Required: Brake bleeder kit, clear tubing, container.
Starting from the furthest wheel from the master cylinder, attach the clear tubing to the bleeder screw.
Open the bleeder screw and have an assistant press the brake pedal several times until fluid flows without air bubbles; then close the screw.
Repeat for all wheels in the correct order (typically RR, LR, RF, LF).
Check the brake fluid level in the master cylinder periodically during this process.

5. Inspect and Replace Brake Components

Tools Required: Socket set, torque wrench.
Remove the wheel and inspect brake pads, rotors, and calipers.
Replace worn brake pads or damaged rotors as necessary.
Reassemble the wheel and torque to specifications.