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

563 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 in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms, diagnostic steps, 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 electrical systems.
•Allow the brake system to cool before handling components.

Symptoms

•Soft brake pedal feel
•Brake pedal travels to the floor
•Increased stopping distance
•Brake warning light illuminated on the dashboard
•Possible fluid leakage under the vehicle

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for any visible leaks in brake lines, hoses, and around calipers.
3
Examine brake pads for wear and ensure they are not excessively worn.
4
Test for air in the brake lines by performing a brake bleed.
5
Scan for any error codes related to the braking system using an OBD-II scanner.

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
•Socket set
•Wrench set
•Jack and jack stands

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Replacement brake lines or calipers (if leaks are found)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for any visible leaks in brake lines, hoses, and around calipers.
3
Examine brake pads for wear and ensure they are not excessively worn.
4
Test for air in the brake lines by performing a brake bleed.
5
Scan for any error codes related to the braking system using an OBD-II scanner.

Solution

1. Preparation

Gather tools and parts.
Ensure the vehicle is on a flat surface and securely elevated using jack stands.
Wear safety gloves and goggles.

2. Inspect and Top Up Brake Fluid

Sub-steps:
- Open the hood and locate the brake fluid reservoir.
- Check the fluid level; if low, top it up with manufacturer-recommended brake fluid (DOT 3 or DOT 4).
- Inspect the condition of the fluid; if it appears dark or contaminated, consider flushing the system.

3. Inspect Brake Lines and Components

Sub-steps:
- Visually inspect brake lines and hoses for any signs of wear, corrosion, or leaks.
- Check brake calipers for any fluid leakage.
- If leaks are found, replace the affected components (lines, hoses, or calipers).

4. Bleed the Brake System

Sub-steps:
- Begin at the wheel furthest from the master cylinder (usually the rear passenger side).
- Use a brake bleeder kit; attach it to the bleeder valve on the caliper.
- Have an assistant pump the brake pedal several times and hold it down.
- Open the bleeder valve to release air and fluid, then close it before the assistant releases the pedal.
- Repeat this process until no air bubbles are present in the fluid.
- Move to the next wheel (rear driver side, then front passenger side, and finally front driver side).

5. Final Checks

Sub-steps:
- After bleeding all brakes, check the fluid level in the master cylinder again and top off if needed.
- Test the brake pedal feel before lowering the vehicle.
- Ensure that all components are securely fastened and the system is free of leaks.