How often should I replace the brake fluid on my Subaru Forester?
As a general rule, you should replace the brake fluid in your Subaru Forester every 2-3 years or 30,000 miles, whichever comes first. Proper maintenance of your vehicle's brake system is crucial for ensuring safe and reliable performance, and regularly changing the brake fluid is an important part of that.
Why Brake Fluid Needs to Be Replaced
Brake fluid is a critical component of your Subaru Forester's braking system. It transmits the force from the brake pedal to the brake calipers, causing the brake pads to press against the rotors and slow or stop the vehicle. Over time, brake fluid can become contaminated with moisture, which can lower its boiling point and reduce its effectiveness. This can lead to a "spongy" brake pedal feel and increased risk of brake failure, especially during heavy or repeated braking.
Additionally, the brake fluid in your Forester contains additives that help prevent corrosion and maintain the integrity of the system's components. As the fluid ages, these additives become depleted, leaving the system vulnerable to damage.
Recommended Brake Fluid Replacement Interval
Subaru recommends replacing the brake fluid in the Forester every 2-3 years or 30,000 miles, whichever comes first. This interval is based on the typical lifespan of the fluid and the conditions it experiences in normal driving. However, if you frequently tow heavy loads, drive in mountainous areas, or engage in aggressive braking, you may need to replace the fluid more often.
It's important to use the correct type of brake fluid specified by Subaru, which is typically a DOT 3 or DOT 4 fluid. Using the wrong fluid can damage the system's components and lead to brake failure.
Signs It's Time to Replace Brake Fluid
- Spongy or soft brake pedal feel: This can indicate that the brake fluid is contaminated and needs to be replaced.
- Decreased braking performance: If you notice that your Forester's brakes are not as responsive or effective as they once were, it may be time for a fluid change.
- Visible fluid discoloration: Brake fluid should be clear or slightly amber in color. If it appears dark or murky, it's likely time for a replacement.
If you notice any of these signs, it's best to have your Subaru Forester's brake system inspected by a qualified mechanic as soon as possible. Neglecting to replace the brake fluid can lead to more serious and costly issues down the road.
Conclusion
Regularly replacing the brake fluid in your Subaru Forester is an essential maintenance task that helps ensure the safety and reliability of your vehicle's braking system. By following Subaru's recommended replacement interval of every 2-3 years or 30,000 miles, you can help prevent brake-related problems and keep your Forester running at its best.
What is the 100000 mile service on a Subaru Forester?
A Subaru Forester's 100,000-mile service is an extensive maintenance check that includes replacing the spark plugs, changing transmission and differential fluids, and performing all previous 10,000 and 20,000-mile service items like oil and filter changes, tire rotations, and brake inspections. It also involves inspecting and servicing fluids, filters, belts, hoses, brakes, suspension, and steering components.
Key tasks at 100,000 miles
- Engine and fluids:
- Replace spark plugs
- Replace engine oil and filter
- Replace transmission and differential fluids
- Replace engine coolant
- Inspect and adjust all fluid levels
- Filters and belts:
- Replace engine and cabin air filters if necessary
- Inspect and adjust drive belt tension
- Brakes and tires:
- Inspect and service front and rear brakes
- Rotate tires and inspect for wear
- Inspect tires and adjust all tire pressures
- Perform a wheel alignment (recommended)
- Inspection and lubrication:
- Inspect axle boots
- Inspect steering and suspension components
- Inspect all lights, wipers, and washers
- Inspect the undercarriage for damage
- Lubricate latches, hinges, and locks
- Service the battery
How often should I change the brake fluid on my Subaru Forester?
every 30,000 miles
Subaru recommends new brake fluid every 30,000 miles, but if your vehicle has any of the following warning signs, we recommend an immediate brake inspection and regular brake fluid flush service: Brake light is on. Grinding, squealing, or squeaking sounds. Leaking fluid Wobbling or vibration when braking.
Is a brake fluid flush really necessary?
Yes, a brake fluid flush is necessary to prevent brake system failure. Brake fluid is hygroscopic, meaning it absorbs moisture from the air, which can lower its boiling point and cause corrosion within the brake system. This can lead to spongy brakes, reduced stopping power, and potential failure, especially under heavy braking conditions.
This video explains what brake fluid is and why it's important: 1mRoyalty Auto ServiceYouTube · Mar 28, 2025
Why a brake fluid flush is important
- Prevents corrosion: Moisture absorbed by the brake fluid can cause internal corrosion of brake lines and components, which can compromise the system's integrity.
- Maintains performance: The presence of water in the fluid lowers its boiling point. Under heavy braking, this moisture can turn to steam, leading to a soft or spongy brake pedal and a reduction in braking ability.
- Avoids system damage: A flush removes old, contaminated fluid, which can prevent damage to expensive components like the ABS system.
How often should you get a flush?
- General recommendation: Most manufacturers recommend a flush every two to three years or approximately every 30,000 miles, whichever comes first.
- Driving conditions: If you frequently drive in humid or wet conditions or perform heavy braking (e.g., mountain driving, towing), you may need more frequent flushes.
- Owner's manual: Always consult your vehicle's owner's manual for the specific maintenance schedule recommended by the manufacturer.
This video demonstrates how to check the brake fluid with a tester: 59sFaye HadleyYouTube · Sep 4, 2023
Do I really need to replace brake fluid every 2 years?
YOU SHOULD REPLACE BRAKE FLUID EVERY FEW YEARS
And the best way to find out how often to change brake fluid is to follow your manufacturer's recommendations. Some manufacturers say you should replace your brake fluid every two years. Others recommend every three years, or every 45,000 miles.
