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Why Is My Mercedes C320 Rear Wheel Leaking Brake Fluid?

Over the past few days if you’re noticing some kind of fluid under your vehicle, near the wheel. You might wonder if it could be brake fluid leaking from your car’s brake system. Which made you anxious thinking about why is my mercedes c320 rear wheel leaking brake fluid? Remember your brakes are the most crucial safety system on your vehicle. The braking system composes of a brake pedal, switches, reservoirs, brake lines, cylinders, links, pistons, and brake fluid. Most automotive brake systems are hydraulic. This means that pressurized fluid is sent through the lines from the master cylinder to the calipers and drums. In order to activate the pads and slow down the car.

Components such as the reservoir, master cylinder, and brake lines are stationary while switches and pistons are frequently on the move. Damage to any of these components can result in brake fluid leaks that can affect the performance and response of your vehicle’s braking system. If your brake fluid is leaking, it’s a sign that there’s something seriously wrong. Keeping your brake system in proper working order is critical to maintaining a safe and dependable vehicle.

What Is A Brake Fluid?

Brake fluid is the liquid chemical solution use in the hydraulic braking systems of modern cars. It is essential for the safe operation of your vehicle. It amplifys your foot’s force on the brake pedal and turn it into pressure on your car’s brakes. First, it needs a constant viscosity across wide temperature ranges. The best way to determine the right brake fluid type for your car is to check the owner’s manual or ask your nearest car care experts. A brake fluid leak can cause a loss of brake pressure, resulting in an inability to stop the vehicle.

What Does Brake Fluid Do?

Before discussing mercedes c320 rear wheel leaking brake fluid. First, let’s see what does brake fluid do? The force from your foot is enhanced by a vacuum booster just behind the pedal. This boosted force activates the master cylinder, which pushes pressurized brake fluid into the brake lines. The harder you press on the brake pedal, the more pressurized the fluid becomes, which increases the stopping force applied by the brakes. From there, the brake fluid flows through the brake lines until it reaches the caliper on each wheel.

At that point, the pressurized fluid forces a set of pistons to push the brake pads against a spinning rotor. This works because liquid including brake fluid is incompressible, meaning it can act as a solid force under pressure, even though it moves as a liquid. When the brake pads rub against the rotor, the friction causes the wheels to slow and eventually stop.

Reasons Behind Mercedes C320 Rear Wheel Leaking Brake Fluid?

The vehicle’s braking system is both simple and complex. There are a number of parts required to make it work properly. However, if fluid is leaking from somewhere in the system, it could mean that you’ll have insufficient fluid for proper brake operation.

1. Worn Brake Pads:-

If you’re suspecting the fluid is leaking because of the level in the reservoir is low. Then, it might be nothing more than worn pads. As the pads wear, more fluid is held in the system because the caliper piston remains farther out due to the reduced pad material.

2. Damaged Master Cylinder Reservoir:-

The plastic reservoir attached to your master cylinder becomes brittle due to heat exposure by the time passes. It can eventually crack, allowing brake fluid to seep out and down the back of the engine.

3. Faulty Or Damaged Bleeder Valve:-

Each caliper has a bleeder. These valves allow mechanics to bleed air out of the lines, but they can become damaged leading to your mercedes c320 rear wheel leaking brake fluid.

4. Damaged Brake Line:-

Your car has both rubber and steel brake lines that carry fluid to and from the master cylinder. Both types are prone to wear and can be punctured. If this occurs, fluid will steadily leak out of the line.

5. Faulty Wheel Cylinder:-

On drum brakes, one of the most likely culprits is the wheel seal. Which fails over time and through normal wear and tear, eventually lead to weeping brake fluid.

6. Damaged Piston Seal:-

The piston in your caliper is activated by fluid, and it’s a moving part, which means a seal is necessary to keep the fluid inside while allowing the piston to move. If the seal is damaged or cracked it will leak brake fluid.

Therefore, these are some common reasons behind your mercedes c320 rear wheel leaking brake fluid.

What Is The Average Repairing Cost Of The Brake Fluid Leak?

On average, the cost for a Mercedes-Benz C320 Brake fluid is leaking Inspection is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

How To Diagnose The Brake Fluid Leak?

If you’re facing brake fluid leaks in your mercedes c320 then you should carefully pop the hood and check the brake fluid reservoir to confirm a leak. A severe leak will cause very low brake fluid levels in the reservoir. If you’re having trouble locating the brake fluid reservoir, you can refer to your vehicle’s owner’s manual. Or else you should look out for a professional to diagnose the issue carefully. 

The mechanic will inspect all aspects of your vehicle’s brake system, including possibly checking trouble codes in the computer if the ABS light is on (set off by the brake fluid level sensor). The mechanic will trace the leak to its origin, and then advise you on the next step required to repair the problem.


We hope the above-mentioned information about your mercedes c320 rear wheel leaking brake fluid will be helpful to all the readers. If anybody’s doubts persist feel free to comment in the comment section below. We’ll try to solve your doubts as soon as possible.