How to Change Your Ford Focus Brake Fluid

By Nick Marchenko, PhD

Brakes play a crucial role in the functioning of any vehicle. Brake fluid, one of the most vital components in your Ford Focus, serves several critical purposes.

It resists moisture, which can lead to vapor lock brake failures, protects against corrosion, and endures the high temperatures generated during braking.

According to the owner's handbook for your automobile, it is important to change the brake fluid occasionally. In some circumstances, you might need a second individual to help.

Key Takeaways:

1. Ford Focus brake fluid resists moisture and endures high temperatures.
2. Changing brake fluid is complex and not for average DIY enthusiasts.
3. Different brake fluids exist; Ford Focus recommends DOT 4.
4. Changing brake fluid requires draining, refilling, and caliper attention with assistance.

Our guide outlines 10 essential steps to aid you in comprehending the process. However, it's important to note that changing brake fluid is not a task suited for the average DIY enthusiast.

It demands a level of professional training. Modern braking systems operate under extremely high pressures, further emphasizing the need for expertise.

To ensure compliance with legal regulations, it is advisable to consult your Ford Focus manufacturer's manual regarding any repairs to the braking system, as some may only be permitted at authorized workshops.

When to schedule a brake fluid change

1. Spongy pedal sensation: If you notice a spongy feel when pressing the brake pedal, it is time to consider changing the brake fluid.
2. After brake line servicing: Whenever the brake lines are opened during maintenance or repairs, it's advisable to include a brake fluid change in the procedure.
3. Fluid examination: Regularly inspect the brake fluid. Ideally, it should have a yellowish and translucent appearance. If the fluid appears dirty or contaminated, it is likely overdue for replacement. To prevent brake fade due to contaminated brake fluid, follow these additional guidelines:

Avoid frequent reservoir opening

Refrain from frequently opening the brake fluid reservoir to check fluid levels. This action introduces air and moisture into the braking system. The reservoir typically features max and min lines, allowing you to monitor fluid levels without the need to remove the cap.

Use fresh containers when topping up

Never use fluid from a previously opened container. Such fluid containers may have absorbed moisture over time, compromising the quality of the brake fluid. Always opt for fresh, sealed containers for brake fluid additions.

How to choose brake fluid types for your Ford Focus

Brake fluid comes in various types, denoted as DOT 3,4,5, and 5.1. These distinctions primarily revolve around the fluid's viscosity and boiling points.

Given the substantial heat generated during braking, which is subsequently transferred to the brake fluid, understanding these boiling points is crucial.

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If your brake fluid reaches its boiling point during intense braking, it can lead to the introduction of air into the system, resulting in brake failure.

A valuable guideline to follow is adhering to the vehicle manufacturer's recommendations for selecting the appropriate brake fluid. It is essential to note that brake fluids are generally not interchangeable, especially when it comes to DOT 5, which is silicone-based, while the others are glycol-based. In this case, for Ford Focus, it is better to choose a fluid that complies with the DOT 4 standard.

How to change the brake fluid

While it is important to acknowledge that each vehicle may have its unique characteristics, the general procedure for this task remains consistent.

However, before we proceed, there is an important note: having a second person assist you greatly simplifies the process. While there are techniques for solo brake bleeding, they often lack the effectiveness of having a helper apply pressure to the pedal.

1. To start, it is advisable to elevate the Ford Focus using jack stands and remove all four wheels before commencing the procedure.
2. Drain the old fluid:
   Begin by removing the cap from the brake master cylinder. Employ a turkey baster or a similar tool to extract as much of the old fluid as possible. Collect this used fluid in an appropriate container for proper disposal. After removing the old fluid, wipe out the reservoir of any possible debris using a lint-free cloth.
3. Refill the master cylinder:
   After completing the cleaning, refill the master cylinder with fresh new fluid, filling it up to the max line. Ensure you use the correct specification of brake fluid, typically indicated on the master cylinder cap. Do not replace the cap at this stage, as you will need to top it up multiple times. The goal is to displace all the old fluid with the clean new fluid.
4. Addressing the calipers/cylinders:
   Each brake caliper or drum brake wheel cylinder possesses a bleed nipple on the back. Begin by spraying each of these components with brake cleaner to remove grease and grime. Follow this by applying penetrating oil to loosen them up.
5. Starting with the farthest:
   In most cases, you should commence with the wheel furthest from the master cylinder, which is usually the rear wheel on the passenger side. Attach a short length of rubber hose to the bleed nipple and submerge the hose's end into the container used to collect the old brake fluid from the master cylinder.
6. Cooperate with a helper:
   With your assistant positioned in the driver's seat, proceed to the first bleed nipple. Place a block under the brake pedal to prevent it from reaching the floor. Instruct your helper to pump the brakes three times and then hold the pedal down. While they maintain pressure on the pedal, loosen the bleed nipple, allowing old fluid and any trapped air to escape. Tighten the nipple and signal your helper to repeat the process. Continue this cycle until new fluid flows through without any air bubbles.
7. Monitor fluid levels:
   Keep a vigilant eye on the master cylinder's fluid level as you progress. It is crucial to prevent the reservoir from running empty, which would introduce air into the brake lines and necessitate starting over.
8. Repeat for all wheels:
   Follow the same procedure for each wheel, working your way closer to the master cylinder.
9. Final check:
   Once you have finished with the last caliper, the brake pedal should feel firm, indicating that the brake system is now filled with fresh fluid, free of air. Double-check the master cylinder's fluid level and top it off if necessary. Then, close the cap securely.
10. Restore the wheels:
    With all four wheels still removed, this is an opportune moment to perform a tire rotation if desired. Reinstall the wheels, lower the Ford Focus back to the ground, and you are ready to hit the road.

Exercise caution during the initial few miles after working on the brakes. At the next fuel stop, verify the brake fluid level and refill it to the max mark if required.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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