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

588 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 your 2013-2019 Toyota Corolla E170. 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 work on a cool engine to avoid burns.
•Ensure the vehicle is securely supported before working underneath it.
•Wear appropriate safety gear to protect against brake fluid, which is corrosive.

Symptoms

•Soft brake pedal feel
•Brake pedal travels to the floor
•Increased stopping distance
•Possible brake warning light illuminated
•Fluid leakage under the vehicle
•Air noise or hissing sound when pressing the pedal

Diagnostic Steps

1
Inspect the brake fluid level in the reservoir to ensure it's within the recommended range.
2
Check for any visible leaks in the brake lines, calipers, or master cylinder.
3
Use an OBD-II scanner to check for any related error codes that may indicate braking system faults.
4
Inspect the brake pads and rotors for wear or damage.
5
Bleed the brake system to remove any trapped air in the lines.
6
Test the master cylinder for proper operation by applying pressure and monitoring for any fluid movement.

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

•Brake fluid (DOT 3 or DOT 4)
•OBD-II scanner
•Brake bleeder kit
•Wrenches
•Socket set
•Torque wrench

Parts Required

•Brake fluid
•Brake lines (if damaged)
•Brake calipers (if leaking)
•Master cylinder (if faulty)
•Brake pads and rotors (if worn)

Related Faults

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Diagnostic Steps

1
Inspect the brake fluid level in the reservoir to ensure it's within the recommended range.
2
Check for any visible leaks in the brake lines, calipers, or master cylinder.
3
Use an OBD-II scanner to check for any related error codes that may indicate braking system faults.
4
Inspect the brake pads and rotors for wear or damage.
5
Bleed the brake system to remove any trapped air in the lines.
6
Test the master cylinder for proper operation by applying pressure and monitoring for any fluid movement.

Solution

1. Preparation

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

2. Check Brake Fluid and Inspect for Leaks

Open the hood and locate the brake fluid reservoir.
Inspect the fluid level; if low, add DOT 3 or DOT 4 brake fluid as needed.
Visually inspect all brake lines, calipers, and the master cylinder for any signs of fluid leakage.

3. Bleed the Brake System

Locate the brake bleeder valves on each wheel caliper.
Have an assistant pump the brake pedal several times and hold it down.
Open the bleeder valve to release fluid and air, then close it before the pedal is released. Repeat until no air bubbles appear in the fluid.
Ensure to check and refill the brake fluid reservoir as needed during this process.

4. Inspect and Replace Parts if Necessary

If leaks are found, replace damaged brake lines, calipers, or the master cylinder as needed.
Replace worn brake pads or rotors if they do not meet manufacturer specifications.

5. Test Drive and Final Checks

After repairs, take the vehicle for a test drive to ensure the brakes feel firm and responsive.
Recheck the fluid level and inspect for any leaks again after the test drive.