my Toyota Corolla E170 (2013-2019) has a spongy brake feel, what’s causing it

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

577 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 brake feel 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 brake system to cool down before inspection or repair.

Symptoms

•Spongy or soft brake pedal feel
•Longer stopping distances
•Brake pedal sinks slowly to the floor when pressed
•Brake warning light illuminated (if applicable)
•Unusual noises when braking (e.g., squeaking or grinding)

Diagnostic Steps

1
Inspect brake fluid level and condition in the master cylinder reservoir.
2
Check for air in the brake lines by performing a visual inspection and listening for hissing sounds.
3
Examine brake pads and rotors for wear and damage.
4
Inspect brake lines and hoses for leaks or damage.
5
Test the brake master cylinder for proper function and potential internal leaks.
6
Check the brake booster for vacuum leaks or failure.

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
•Screwdrivers
•Torque wrench

Parts Required

•Brake fluid (DOT 3 or as specified by manufacturer)
•Brake pads (if worn)
•Brake rotors (if damaged)
•Brake lines/hoses (if needed)

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Diagnostic Steps

1
Inspect brake fluid level and condition in the master cylinder reservoir.
2
Check for air in the brake lines by performing a visual inspection and listening for hissing sounds.
3
Examine brake pads and rotors for wear and damage.
4
Inspect brake lines and hoses for leaks or damage.
5
Test the brake master cylinder for proper function and potential internal leaks.
6
Check the brake booster for vacuum leaks or failure.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and set the parking brake.
Disconnect the negative terminal of the battery to ensure safety during the repair.

2. Brake Fluid Inspection

Remove the master cylinder cap and check the brake fluid level; top off with manufacturer-recommended brake fluid if low.
Inspect the brake fluid for contamination or discoloration; replace if necessary.

3. Bleed the Brake System

Start at the wheel farthest from the master cylinder (usually the right rear) and work towards the closest (left front).
Use a brake bleeder kit or a clear tube attached to the bleeder valve.
Open the bleeder valve and have an assistant press the brake pedal until fluid flows out; close the valve before the pedal is released.
Repeat the process until no air bubbles appear in the fluid.
Ensure the master cylinder is kept topped off during the bleeding process.

4. Inspect and Replace Brake Components

Remove the wheel to access the brake caliper and pads.
Inspect the brake pads for wear; replace if the friction material is below the minimum thickness.
Check the rotors for wear and warping; resurface or replace if necessary.
Replace any damaged brake lines or hoses observed during inspection.

5. Test the Brake Booster

Inspect the brake booster for vacuum leaks by checking the vacuum line connections.
To test, pump the brake pedal while the engine is off; it should feel firm. Start the engine; the pedal should slightly drop, indicating proper booster function.