Ignitions and Electrical Ignition Components

Dorman

NEW MASTER CYLINDER

$220.25

SKU: D00I M630919

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Dorman M630919 brake master cylinder is engineered to restore proper brake hydraulics in BMW X3 and X4 models. It is constructed from durable cast iron, ensuring consistent performance and longevity.

This master cylinder features a 1-inch bore diameter and includes two M12x1.0 threaded outlets for secure brake line connections. The unit comes without a reservoir or sensors, allowing compatibility with existing components.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandDorman
Part NumberD00I M630919

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy