why do my Toyota Corolla E170 (2013-2019) brakes feel spongy

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

575 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 spongy brakes 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

•Disconnect the battery before working on electrical systems.
•Allow the brakes to cool before working on them, as components can be hot.

Symptoms

•Spongy or soft brake pedal feel
•Increased stopping distance
•Brake warning light illuminated on the dashboard
•Unusual noises when braking (squeaking or grinding)
•Fluid leakage under the vehicle
•Brake pedal sinks slowly to the floor when pressed

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for any visible leaks in the brake lines, calipers, and hoses.
3
Use a brake fluid tester to check for moisture content in the brake fluid.
4
Inspect brake pads and rotors for wear and damage.
5
Bleed the brake system to check for air in the brake lines.
6
Test the brake booster for proper function and vacuum levels.

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 tester
•Socket set
•Wrench set
•Brake bleeder kit
•Jack and jack stands

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake pads (if worn)
•Brake rotors (if damaged)
•Brake lines or hoses (if leaking)

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, calipers, and hoses.
3
Use a brake fluid tester to check for moisture content in the brake fluid.
4
Inspect brake pads and rotors for wear and damage.
5
Bleed the brake system to check for air in the brake lines.
6
Test the brake booster for proper function and vacuum levels.

Solution

1. Preparation

Gather tools and parts required.
Ensure the vehicle is on a level surface and securely lifted with jack stands.
Wear safety goggles and gloves.

2. Inspect and Replace Brake Fluid

Sub-steps:
1. Remove the master cylinder cap and inspect the brake fluid level.
2. If low, top off with the appropriate DOT brake fluid as specified in the owner’s manual.
3. If the fluid is contaminated (dark or cloudy), proceed to replace it.

3. Check for Leaks

Sub-steps:
1. Visually inspect all brake lines, hoses, and connections for signs of fluid leaks.
2. Tighten loose connections if found.
3. Replace any damaged hoses or lines.

4. Bleed the Brake System

Sub-steps:
1. Start from the wheel farthest from the master cylinder (right rear), using a helper if necessary.
2. Attach a clear tube to the bleeder valve on the brake caliper and place the other end in a container.
3. Open the bleeder valve, and have the helper press the brake pedal several times until the pedal feels firm, then close the valve.
4. Repeat for the left rear, right front, and left front wheels, checking fluid levels in the master cylinder throughout the process.

5. Inspect and Replace Brake Components

Sub-steps:
1. Remove the wheel to access the brake caliper and rotor.
2. Inspect brake pads for thickness; replace if worn below specifications.
3. Check the brake rotor for grooves or scoring; replace if necessary.
4. Reassemble the brake components and wheel, ensuring all hardware is torqued to manufacturer specifications.