my Genesis G70 has a pulsating brake pedal when stopping, what should I check

Genesis G70 1st Gen (2018-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

509 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 pulsating brake pedal in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is securely supported on jack stands before working underneath.
•Allow brake components to cool before handling after driving.

Symptoms

•Pulsating brake pedal during braking
•Vibration felt in the steering wheel
•Increased stopping distance
•Brake warning light may illuminate
•Unusual noises when braking (grinding or squeaking)

Diagnostic Steps

1
Inspect brake pads and rotors for wear and damage.
2
Check for warped brake rotors using a runout gauge.
3
Examine brake fluid level and condition; look for contamination.
4
Verify proper installation and tightness of brake components.
5
Scan for any trouble codes related to the brake system using an OBD-II scanner.

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

•Lug wrench
•Jack and jack stands
•Runout gauge
•Torque wrench
•OBD-II scanner

Parts Required

•Brake rotors (if warped)
•Brake pads (if worn)

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Diagnostic Steps

1
Inspect brake pads and rotors for wear and damage.
2
Check for warped brake rotors using a runout gauge.
3
Examine brake fluid level and condition; look for contamination.
4
Verify proper installation and tightness of brake components.
5
Scan for any trouble codes related to the brake system using an OBD-II scanner.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the battery to ensure safety during brake work.

2. Remove Wheel

Use a lug wrench to loosen the wheel lug nuts.
Raise the vehicle using a jack and secure it with jack stands.
Completely remove the lug nuts and take off the wheel.

3. Inspect and Replace Brake Rotors (if warped)

Inspect Rotors:
- Check the surface of the rotors for grooves or warping.
- Use a runout gauge to measure rotor runout; if it exceeds manufacturer specs, replacement is necessary.
Remove Rotors:
- Unbolt the caliper from the rotor and hang it using a bungee cord (do not let it dangle on the brake line).
- Remove the rotor from the hub.
Replace Rotors:
- Install new rotors, ensuring proper alignment and torque the retaining bolts to manufacturer specifications.

4. Inspect and Replace Brake Pads

Inspect Pads:
- Check thickness of the brake pads; if below minimum thickness, replace.
Replace Pads:
- Remove the caliper bracket bolts, then remove the old pads.
- Install new pads in the caliper bracket and reattach the caliper.

5. Reassemble Components

Reattach the caliper over the new pads.
Reinstall the wheel and hand-tighten the lug nuts.
Lower the vehicle and torque the lug nuts to manufacturer specifications.

6. Final Checks

Reconnect the battery.
Pump the brake pedal to seat the pads.
Check brake fluid level and top off if necessary.