Does this master cylinder for Z4 come with the fluid reservoir?

Yes, it is a complete assembly including the reservoir, cap, and grommets.

My brake pedal slowly sinks to the floor; will this master cylinder fix it?

Yes, an internal leak in the master cylinder is a primary cause of a sinking pedal.

Do I need to bench-bleed this master cylinder before installing it in my Z4?

Yes, bench bleeding is essential to remove air and ensure a firm brake pedal.

What warranty coverage is provided on this master cylinder?

We offer a one-year warranty covering any manufacturing defects or premature failure of this component.

How quickly can I expect delivery of this master cylinder for my Z4?

Orders typically ship within 24 hours and standard delivery takes between 3 to 5 business days.

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Part

Master Cylinder

Compatible with BMW Z4

✓ Fits 3 Verified BMW Z4 Variants

Z4 M40iZ4 M40i Pure Impulse ATZ4 M40i Pure Impulse

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Product Description

Maintain full hydraulic pressure to your brakes with this new master cylinder for Z4. When you press the brake pedal, this cylinder converts that force into hydraulic pressure for the calipers or wheel cylinders. The smooth bore and high-quality seals ensure a perfect seal and consistent pedal feel. Replace a failing unit in your Z4 to eliminate a spongy or sinking pedal. Ensure the safety of your Z4 with this essential braking system component.

Key Features

Precision-machined aluminum or cast-iron body for durability
Bore size matched perfectly to OEM specifications for your Z4
Includes a new reservoir and cap with fluid level sensor
Internal surfaces are super-finished for smooth piston travel
100% factory tested for pressure retention and leak-free performance

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