my Toyota Corolla E170 (2013-2019) is making a hissing noise when I press the brakes, why?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

475 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 hissing noise when braking in Toyota Corolla E170. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Brakes

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is securely lifted if working underneath.
•Always allow the engine to cool before inspecting or working on the braking system.

Symptoms

•Hissing noise when pressing the brake pedal
•Reduced braking efficiency or responsiveness
•Brake pedal feels soft or spongy
•Brake warning light may illuminate
•Possible vacuum leak in brake booster

Diagnostic Steps

1
Inspect for vacuum leaks around the brake booster and hoses.
2
Check the brake fluid level and condition in the master cylinder reservoir.
3
Scan the vehicle's OBD-II system for any related error codes.
4
Test the brake booster for proper operation by performing a brake pedal test.
5
Visually inspect the brake lines, calipers, and pads for wear or damage.

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

•Socket set
•Pliers
•Vacuum gauge (optional)
•Brake fluid
•Funnel

Parts Required

•Brake booster hose (if damaged)
•Brake fluid (if low)

Related Faults

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Diagnostic Steps

1
Inspect for vacuum leaks around the brake booster and hoses.
2
Check the brake fluid level and condition in the master cylinder reservoir.
3
Scan the vehicle's OBD-II system for any related error codes.
4
Test the brake booster for proper operation by performing a brake pedal test.
5
Visually inspect the brake lines, calipers, and pads for wear or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface, with the engine off.
Wear safety glasses and gloves for protection.

2. Inspect and Replace Brake Booster Hose

Tools Required: Socket set, pliers, vacuum gauge (optional)
Locate the brake booster hose connected to the brake booster.
Inspect the hose for any cracks or damage.
If damaged, remove the old hose using pliers and socket set.
Install a new brake booster hose and ensure all connections are secure.

3. Test Brake Booster Operation

Tools Required: None
With the engine off, pump the brake pedal several times to deplete vacuum.
After depleting the vacuum, hold the pedal down and start the engine.
The brake pedal should drop slightly if the brake booster is functioning correctly.
If the pedal does not drop, the brake booster may need replacement.

4. Check and Replace Brake Fluid (if necessary)

Tools Required: Brake fluid, funnel
Inspect the brake fluid reservoir for low fluid levels.
If low, remove the cap and add the appropriate type of brake fluid (DOT 3 or DOT 4).
Ensure there are no leaks and that the reservoir cap is securely replaced.