Brakes› Master Cylinders-Boosters and Components

Dorman

NEW MASTER CYLINDER

$136.53

SKU: D00I M39743

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 M39743 brake master cylinder is designed to restore proper brake hydraulics in select Ford and Mazda models. Engineered with durable cast iron and featuring a built-in reservoir, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.

Master cylinder bore diameter is 0.875 inches for precise hydraulic control. Constructed from cast iron for strength and durability, it includes a reservoir for brake fluid storage. The cylinder features two outlet ports with a rearward outlet size of M10 x 1.0 and a secondary outlet thread diameter of 10mm. The thread pitch is 1.0 for secure fitting. The package contains the master cylinder only; mounting hardware is not included.

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 M39743

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