Dorman - First Stop Brake Master Cylinder P/N:M39403
Replace a worn or leaking unit with the Dorman First Stop Brake Master Cylinder M630599, a new master cylinder designed to convert brake-pedal force into hydraulic pressure for the brake lines. It fits many vehicles, among them the 2007-2016 Volkswagen Eos, 2014-2015 Volkswagen Caddy and 2007-2013 Audi A3, all engines. See the Buyer's Guide tab for the full list.
Dorman precision-engineers this master cylinder to replicate the original unit's design, function and performance on the listed applications. It is built from new, high-quality materials for a safe, durable replacement.
Specifications: 0.875 in bore diameter and two outlets. The secondary and rearward outlet threads are M12 x 1.0, and the primary outlet thread pitch is 1 mm. The package contains the master cylinder only; the reservoir, sensor and mounting hardware are not included. Transfer or replace the reservoir and any sensor as directed by the service procedure. Consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Interchange: 100-1072 · 13-3414 · 11-3414 · 11-3874 · 130.33124 · 355-74004
1001072 · 133414 · 113414 · 113874 · 13033124 · 35574004 · NM55382 · MC391231 · 1K1614019D · 1K1614019K · F142349 · MC142349 · R135196
This part cross-references / interchanges with the following part numbers:
Will this Caddy master cylinder fit my 2014-2015 Volkswagen Caddy?
Yes. M630599 is listed as a direct-fit replacement for the 2014-2015 Volkswagen Caddy with all engines. Check the Buyer's Guide tab to confirm your vehicle.
What does a brake master cylinder do?
It converts force from the brake pedal into hydraulic pressure and sends brake fluid through its outlets to the brake lines.
Does it come with a reservoir or mounting hardware?
No. The box holds the master cylinder only. Transfer or replace the reservoir as the service procedure directs, and check the service information for the correct fasteners and whether they may be reused.
What are the key specifications of M630599?
It has an aluminum housing, a 0.875 in bore and two outlets, with M12 x 1.0 secondary outlet threads and a 1 mm primary outlet thread pitch. Its rubber parts use an EPDM compound for resistance to glycol-based brake fluid.
What are signs a master cylinder may need replacing?
A soft or sinking brake pedal, fluid leaking around the unit, or a lit brake warning light can be signs. These can have other causes, so diagnose the brake system before replacing parts.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.