What are the symptoms of a failing brake master cylinder?

Common signs include a brake pedal that feels spongy or sinks to the floor when pressed, a low brake fluid level, or visible fluid leaks around the master cylinder itself. You might also notice reduced braking effectiveness.

Does this master cylinder come with brake fluid?

This DFC brake master cylinder does not include brake fluid. You will need to purchase the appropriate brake fluid for your vehicle separately and bleed the brake system after installation.

What tools are typically needed to replace a brake master cylinder?

Replacing a master cylinder usually requires basic hand tools like wrenches and sockets to disconnect brake lines and mounting bolts. You will also need a brake fluid bleeding kit and potentially a flare nut wrench for the brake lines.

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Est. 1957

DFC 98-03 BMW 740i Brake Master Cylinder

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Specifications

Brand: DFC
Part #: 355-31021
UPC: 190920374999

DFC 98-03 BMW 740i Brake Master Cylinder

Name: DFC 98-03 BMW 740i Brake Master Cylinder
Brand: DFC
Price: 69.46 USD
Availability: InStock

$69.46

Only 8 left in stock

DFC brake master cylinder for many BMW models. Ensures proper brake fluid pressure for reliable stopping.

Key Features

Fits 1998-2003 BMW 525i, 528i, 530i, 540i, 740i, 740iL, 750iL, M5, and X5.
Replaces the original brake master cylinder to restore proper hydraulic pressure.
Designed to meet original equipment specifications for a direct fit.
Ensures consistent brake pedal feel and reliable stopping performance.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

When you're working on the braking system of a BMW like a 540i, 740iL, or even an M5, and you suspect the master cylinder is the culprit, this DFC unit is a solid option. The master cylinder is the heart of your hydraulic braking system; it converts the force from your brake pedal into hydraulic pressure that pushes the brake pads against the rotors. If you're experiencing a spongy pedal, or if fluid is leaking from the unit itself, replacing it is key to restoring safe and effective stopping power.

This DFC master cylinder is built to meet the original specifications for a range of BMW vehicles from the late 90s and early 2000s. It's designed as a direct replacement, meaning it should fit right into the existing brake lines and mounting points without needing modifications. Having a well-functioning master cylinder is critical for consistent brake performance, especially when you need to stop quickly.