Brake Master Cylinder Replacement

A brake master cylinder may need to be replaced for several reasons, including:

1. Leaks: Over time, the brake master cylinder can develop leaks due to worn seals, which can lead to brake fluid loss. This results in reduced brake performance or total brake failure.

2. Contaminated Brake Fluid: If the brake fluid becomes contaminated with moisture or debris, it can damage the internal components of the master cylinder, leading to corrosion and performance issues.

3. Brake Pedal Feels Soft or Spongy: A master cylinder failure can cause air or moisture in the brake lines, which makes the brake pedal feel soft or spongy when pressed, indicating a loss of pressure.

4. Decreased Braking Performance: If the master cylinder is failing, the car may take longer to stop or require excessive pedal pressure. This happens when the cylinder is not delivering enough pressure to the brake system.

5. Visible Damage: If the master cylinder is physically damaged (e.g., cracks or wear on the housing), it may need to be replaced to restore proper brake function.

6. Internal Seal Wear: The seals inside the master cylinder can wear down over time, causing a drop in braking efficiency. This often leads to brake fluid leaking or air entering the brake system.

7. Warning Lights: In some vehicles, a malfunctioning master cylinder may trigger the brake warning light on the dashboard, indicating an issue with the braking system.

8. ABS Issues: In modern cars with Anti-lock Braking Systems (ABS), a faulty master cylinder can interfere with the proper functioning of the ABS, leading to reduced braking effectiveness.

In any of these cases, it’s crucial to have the brake master cylinder inspected and replaced as soon as possible to ensure safe braking performance.

Steps to replace Brake Master Cylinder on 2013 Hyundai Genesis 5.0

Step 1- Remove negative battery terminal 

Step 2 - Remove engine top cover 

Step 3 - Remove ECU cover 

Step 4 - Unplug ECU move aside

Step 5 - remove brake fluid level sensor plug 

Step 6 - remove 11mm bolt from master cylinder brake lines 

Step 7 - remove both 12mm bolts holding the cylinder to brake booster 

Step 8 - remove any brake fluid from reservoir and install to new master cylinder 

BRAKE BLEED SYSTEM AFTER THESE STEPS ARE DONE! Below is attached the sequence the brakes should be bled in.

The sequence for the brake bleed in a Hyundai Genesis 5.0

Watch this video for a quick tutorial to the brake master cylinder:

quick tutorial to the brake master cylinder