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Brake Fluid Replacement/Flush

BMW 640i xDrive Brake Fluid Flush Cost

The average cost for a BMW 640i xDrive Brake Fluid Replacement/Flush is between $104 and $143. Labor costs are estimated between $70 and $89 while parts are priced between $34 and $54. Estimate does not include taxes and fees.
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How Much Does a Brake Fluid Replacement/Flush Cost?

Brake Fluid Replacement/Flush Service and Cost

Brake Fluid Replacement/Flush
What is a brake fluid flush?

Brake fluid is a specially formulated fluid that transmits the pressure generated by the master cylinder to the calipers and/or wheel cylinders when the brake pedal is pressed.

How does the brake fluid flush work?

Using a servicing tool, the brake fluid will be completely exchanged for fresh fluid.

What are the symptoms related to bad brake fluid?

When new, brake fluid is typically a translucent light gold color. The brake fluid may become dark or discolored. A "spongy" or soft brake pedal may be noticed, especially during repeated stops from highway speeds. Brake fluid is hygroscopic, meaning it absorbs moisture from the air. This moisture decreases the fluid's ability to transmit braking force after repeated applications, such as in heavy traffic or going downhill.

Can I drive with a brake fluid flush problem?

It is not recommended to drive a vehicle for too long past the replacement interval. The vehicle may continue to stop at low speeds, but risk increases in the case of repeated stops in traffic, or cases where brake fade (soft and ineffective pedal) is probable, such as braking down a long hill or decline.

How often do brake fluid flushes need to be performed?

The standard replacement interval for brake fluid is two years, or every 20,000 miles.

Brake Fluid Replacement/Flush Repair Information

How are brake fluid flush issues diagnosed?

In the case where the last service mileage is unknown, a visual inspection for discoloration may be sufficient. There are also tools that measure for moisture contamination to determine if a brake fluid flush is needed.

How is a brake fluid flush performed?

Using a brake system servicing tool, the master cylinder reservoir is cleared of old fluid and filled with new. At each corner of the vehicle, the technician will open a bleeder screw on the caliper or wheel cylinder to bleed all old brake fluid and any air out of the system. This step is repeated on each corner until the fluid is completely new.

RepairPal Recommendations for brake fluid flush issues

You should always use the manufacturer's recommended brake fluid. When bleeding the system, make sure the master cylinder stays full of brake fluid so as to not introduce air to the system. A pressure bleeder is a tool that can make performing this job more efficient

What to look out for when dealing with brake fluid flush issues

Besides discoloration, old brake fluid with moisture contamination will promote rust in the braking system. Over time this rust can reduce braking capabilities by clogging calipers, lines and the ABS system. It is important not to exceed the recommended two year replacement interval for brake fluid.

Can I perform the brake fluid flush myself?

When performing maintenance or repairs on the brake system it is extremely important to research and understand the proper procedures necessary to complete a job. It is critical for the brake fluid to be bled properly to prevent air from getting into the system. Many modern cars also require special computer modules in order to communicate with and cycle the ABS system for complete bleeding. If you lack the required tools to perform maintenance or repairs to the system, consider contacting a RepairPal Certified Shop.

Most Common BMW 640i xDrive Repairs

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Parts
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