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

4 min read

604 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 symptoms, diagnostic steps, and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always allow the vehicle to cool before working on the braking system.
•Ensure the vehicle is securely elevated if working on the brakes underneath.
•Disconnect the battery before starting work on any electrical components.

Symptoms

•Brake pedal feels soft when pressed
•Brake pedal travels to the floor
•Longer stopping distance
•Brake warning light may be illuminated
•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 the brake lines or around the brake calipers.
3
Inspect the brake pads and rotors for wear.
4
Examine the brake master cylinder for signs of failure or internal leaks.
5
Use a brake bleeder kit to check for air in the brake lines.
6
Test the brake booster for proper function, if applicable.

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 bleeder kit
•Socket set
•Wrench set
•Screwdriver set
•Torque wrench

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake lines (if damaged)
•Brake pads and rotors (if worn)
•Master cylinder (if faulty)

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 the brake lines or around the brake calipers.
3
Inspect the brake pads and rotors for wear.
4
Examine the brake master cylinder for signs of failure or internal leaks.
5
Use a brake bleeder kit to check for air in the brake lines.
6
Test the brake booster for proper function, if applicable.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
Disconnect the battery to prevent any electrical issues during repair.

2. Check Brake Fluid

Remove the master cylinder reservoir cap.
Inspect the brake fluid level; if low, top it up with the recommended DOT fluid (usually DOT 3 or DOT 4).

3. Inspect Brake Lines

Visually inspect brake lines and hoses for any signs of corrosion, damage, or leaks.
If any leaks are detected, replace the affected brake lines or hoses.

4. Bleed Brake System

Use a brake bleeder kit to remove any air from the brake lines:
1. Start with the wheel furthest from the master cylinder (typically the rear passenger side).
2. Attach the bleeder kit to the brake bleeder valve on the caliper.
3. Have an assistant press the brake pedal while you open the bleeder valve to allow fluid and air to escape.
4. Close the valve before your assistant releases the brake pedal to prevent air from re-entering.
5. Repeat the process for each wheel in the order: rear passenger, rear driver, front passenger, and front driver.

5. Inspect and Replace Master Cylinder (if necessary)

If the problem persists, inspect the master cylinder for internal leaks:
1. Disconnect brake lines from the master cylinder.
2. Remove the master cylinder from the brake booster.
3. Replace with a new or reconditioned master cylinder if leaks are found.

6. Reassemble and Test

Reattach all components in reverse order.
Refill the master cylinder with brake fluid.
Reconnect the battery.
Conduct a test drive to ensure proper brake function.