How to Recognise if a Car Needs a Brake Fluid Change

Most car owners understand the importance of keeping the brakes in good condition to ensure they can drive safely, brake effectively, and avoid accidents. However, brake fluid is often overlooked, despite playing a crucial role in the braking system. Without it, the brakes wouldn’t function which is why regular brake fluid checks are essential for safety, responsive braking, and reducing the risk of costly repairs. In this post, we’ll explain what brake fluid is, the vital role it plays in a vehicle’s braking system, and how to recognise when it might be time for a brake fluid change.

What is Brake Fluid and Why is it Important?

Brake fluid is a hydraulic fluid used in a car’s braking system to transfer pressure from the brake pedal to the brake components. This is what allows the car to slow down or stop when the brake is pressed, and without brake fluid the brakes simply wouldn’t function. Over time, brake fluid absorbs moisture from the air, which can lead to reduced performance, internal corrosion, and even brake failure if it isn’t replaced.
Regular brake fluid changes are an important part of car maintenance. Many drivers don’t realise that brake fluid has a lifespan and should be replaced every two to three years, or as recommended by the vehicle manufacturer. By keeping a car’s brake fluid clean and fresh, it helps ensure safe and responsive braking, protect key components within the system, and reduce the risk of expensive repairs in the future.

Risks of Ignoring Brake Fluid Maintenance

Ignoring brake fluid maintenance might not cause any immediate issues, but over time it can lead to serious safety risks and costly repairs. Here are just some of the potential risks if the brake fluid isn’t checked and changed regularly:

Reduced Braking Performance: Brake fluid that’s old or contaminated can’t generate the same pressure, which means the brakes may feel less responsive. This can increase stopping distances and make the car feel sluggish when braking, especially in emergencies.

Brake Fade or Failure: As brake fluid absorbs moisture over time, its boiling point drops. Under heavy braking (such as driving downhill or during sudden stops), the fluid can overheat and vaporise, causing brake fade or total failure.

Corrosion Inside the Brake System: Moisture in the fluid can lead to rust and corrosion inside vital components like brake lines, callipers, and the master cylinder. This internal damage often goes unnoticed until it becomes a serious and expensive problem.

If you’re unsure whether your car needs a brake fluid change, it’s best to contact a professional garage such as Service MOT Repairs - our highly trained mechanics can inspect the brake fluid and advise on whether it’s time for a change.

How to Recognise when it’s Time for a Brake Fluid Change

As brake fluid doesn’t run out in the same way fuel or oil does, it can be harder to know when it’s time for a change. Most manufacturers recommend replacing it every 2 to 3 years, but signs of wear can appear sooner depending on the driving habits and mileage. Below, we share some common indicators that a car may be due for a brake fluid change;

Spongy or Soft Brake Pedal: A brake pedal that feels unusually soft or sinks lower than usual when pressed can be a sign of air or moisture in the brake fluid. This can reduce hydraulic pressure and affect braking performance. If you notice a change in pedal responsiveness, it’s advisable to have the fluid checked by a professional mechanic without delay to ensure there aren’t any problems.

Increased Stopping Distance: If the vehicle is taking longer to stop than normal, worn or contaminated brake fluid could be to blame. Reduced fluid efficiency can impact braking speed and safety, particularly in emergency situations. Any noticeable increase in stopping distance should be investigated promptly to ensure the braking system is functioning effectively and to prevent potential hazards on the road.

Brake Warning Light On: Modern vehicles are equipped with dashboard warning lights to indicate system faults, including issues related to brake fluid. If the brake warning light comes on, it may mean the fluid is low, degraded, or there’s a problem within the braking system. It’s essential to have the vehicle inspected immediately in such cases to maintain safe and reliable driving conditions.

Discoloured Brake Fluid: Brake fluid should be clear or have a light amber appearance. If the fluid looks dark brown, murky, or dirty, it could indicate contamination or that it has aged beyond its recommended lifespan. Visual inspection of the fluid is a quick and useful way to check its condition, and discolouration is a clear sign that a change is needed.

Unusual Brake Noises: Strange sounds such as squealing, grinding, or groaning when applying the brakes may point to problems with brake components or degraded brake fluid. Contaminated fluid can lead to uneven braking and increased wear on parts. While noises can stem from various issues, it’s important to include the fluid in the checks to rule out any underlying causes.

Need to Book a Brake Fluid Change in Kettering? 

If you’re looking to book your brake fluid change in Kettering and want a reputable local garage, why not choose Service MOT Repairs? We’re a Northampton based car garage offering a comprehensive range of repair and servicing options, including brake fluid changes. We also offer a range of other brake related services, including brake disc and brake pad repairs and replacements. To enquire regarding booking a brake fluid change, simply fill out our online contact form and we’ll get back to you shortly, give us a call on 01604 491011, or book online.