Turn brake-pedal force into the hydraulic pressure that stops your vehicle with the Raybestos Element3 Brake Master Cylinder (MPN MC390613). This new aluminum unit drops in as a direct-fit replacement for the 1997-2000 Audi A8, 1997-2003 Audi A8 Quattro, 1999-2001 Audi A4, A4 Quattro, A6 and A6 Quattro, 2000-2001 Audi S4, 2001-2003 Audi S8, and 2000-2001 Volkswagen Passat (all engines).
- OE fit, form, and function: materials matching OE specifications and built to each vehicle-specific design so it fits the application like the original.
- 100% pressure tested: every cylinder is end-of-line pressure tested for consistent, safe, reliable operation.
- Ready to install: arrives ready to bench bleed and install with no assembly required.
- Build: aluminum body with two M12x1 outlet ports and two mounting holes measuring 0.854 in.
A brake master cylinder converts pedal force into hydraulic pressure that acts on the caliper and wheel-cylinder pistons, with its two outlet ports feeding the dual brake circuits. Signs the original may need replacing include a pedal that slowly sinks under steady foot pressure, a spongy pedal, or loss of brake fluid; diagnose the cause before replacing. The reservoir, cap, fluid-level sensor, bleeder hoses, and brake booster are not included. Country of origin: China.
Interchange: 11-2777 · 112777 · 11-2920 · 112920 · MCA630153 · 13639 · NMC21808 · NMC2920 · 13-2777 · 132777 · 13-2920 · 132920 · 130.33115 · 131.33115 · M630153 · 4D0611021A · F139960 · MC139960 · V0160 · Manufacturer part number MC390613 · Part Eazy SKU MC390613
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Will this master cylinder fit my vehicle?
It fits the 1997-2000 Audi A8, 1997-2003 A8 Quattro, 1999-2001 A4/A4 Quattro/A6/A6 Quattro, 2000-2001 S4, 2001-2003 S8, and 2000-2001 VW Passat (all engines). Check the Buyer's Guide tab to confirm.
Does it include a reservoir or cap?
No. The reservoir, cap, fluid-level sensor, bleeder hoses, and brake booster are not included, so transfer or source those separately as directed by the service procedure.
What is the master cylinder made of?
The body is aluminum. It has two M12x1 outlet ports and two mounting holes measuring 0.854 in.
Do I need to bench bleed it before installing?
It arrives ready to bench bleed and install with no assembly required; follow the vehicle service procedure for bench bleeding and bleeding the brake system.
How do I know my master cylinder is failing?
Signs the original may need replacing include a pedal that slowly sinks under steady pressure, a spongy pedal, or brake fluid loss. Diagnose the cause before replacing.
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