Clutch Master Cylinder for Ford Escort, Mazda 6 / 323 / Protege / MX-3 & Mercury Tracer – XUI3107A

CM246

Vehicle Compatibility & Corresponding OE Part Numbers

Vehicle Model	Production Years	OE Reference Numbers
Ford Escort	1991–2003	F1CZ-7A543-A / F4CZ-7A543-AA / F7CZ-7A543-AA / 1S4Z-7A543-AA
Mazda 6	2003–2008	GJ6A-41-990 / GJ6A-41-990A
Mazda 323	1990–1994	BR70-41-990 / BR70-41-990A
Mazda MX-3	1992–1995	BC6D-41-990A
Mazda Protege	1990–1998	BR70-41-990 / BR70-41-990A
Mercury Tracer	1991–1999	F1CZ-7A543-A / 1S4Z-7A543-AA

Item Technical Specifications

Item	Specification
Model	XUI3107A
Bore Diameter	15.87mm
Mounting Size	Φ28.8 / 60 / 45° / Φ9, M8×1.25 bolt
Connecting Size	M10 × 1.0
DORMAN Cross Reference	CM39820
Installation	Direct replacement
Packaging	Neutral box / OEM custom branding available

Quality & Sourcing Standards

Standard	Description
ISO 9001	Ensures consistent dimensional tolerances and uniform batch quality for all production runs
IATF 16949	Official automotive supply chain certification for both OEM and aftermarket procurement
VDA6	German standard audit framework to provide complete documentation for distributor qualification

 For North American and Latin American distributors integrating XUI3107A into existing Ford and Mazda catalog lines, IATF 16949 compliance supports the technical documentation requirements expected by established automotive parts procurement channels.

One Part Number, Six Models — The Ford-Mazda Platform Connection
XUI3107A covers six vehicles across three brands, spanning nearly two decades of production.
This breadth reflects the shared platform architecture between Ford and Mazda during this era: the Escort, Protege, and Mercury Tracer all drew from the same front-wheel-drive engineering base, while the Mazda 6 carried forward compatible hydraulic clutch specifications into the 2000s.
For distributors, this wide fitment window is a direct inventory efficiency advantage — a single SKU serves demand from multiple model communities simultaneously, reducing catalog complexity without sacrificing coverage depth.
The clutch master cylinder on these platforms is firewall-mounted and directly coupled to the pedal assembly. Ford and Mazda both positioned these vehicles as daily-use commuter and family cars, meaning the clutch system accumulates actuation cycles rapidly in urban driving conditions.
As hydraulic fluid ages and seal compounds harden over time, internal bypass develops gradually — often going unnoticed until pedal feel has already changed significantly.
On vehicles now 20 to 30 years old, fluid that has never been replaced compounds seal wear considerably, making master cylinder replacement one of the most common clutch hydraulic service items across all six platforms.

Common failure patterns across these platforms:
Clutch pedal slowly loses resistance and stays low — piston seal bypass allowing pressure to bleed off
Hard to find neutral at traffic stops — incomplete clutch disengagement under heat
Fluid disappears from reservoir with no drip under the car — internal leak past seals without external evidence
Pedal engages at a different point each drive — inconsistent pressure buildup from partial seal failure

Market Application
North America — Ford Escort and Mercury Tracer are high-volume catalog search items on Amazon and DORMAN-driven platforms; Mazda 6 and Protege enthusiast communities sustain consistent independent demand
Latin America — Ford Escort and Mazda Protege remain in daily use across Mexico, Colombia, and Argentina; CM39820 is a recognized reference in regional catalog systems
Australia & Southeast Asia — Mazda 323 and Protege were strong market sellers; independent workshop demand continues as these vehicles exceed 25 years of service age

Q1: Ford uses F-prefix OE numbers while Mazda uses alphanumeric codes — does XUI3107A genuinely cover both brands?
Yes. The Ford Escort and Mazda Protege/323 shared platform components under the Ford-Mazda manufacturing partnership. The clutch master cylinder specification is physically identical across both brands — only the part numbering system differs. All listed OE references cross to the same unit.

Q2: The Ford Escort was produced from 1991 to 2003 — did the OE number change during that run?
Yes. Ford issued four successive OE numbers across the Escort's production life (F1CZ → F4CZ → F7CZ → 1S4Z). Each supersedes the previous. XUI3107A is manufactured to the final superseded specification and replaces all four directly.

Q3: Is CM39820 the standard catalog reference for this part in North American distribution channels?
Yes. DORMAN CM39820 is the primary reference used by AutoZone, O'Reilly, RockAuto, and Amazon for this application. Distributors targeting North American wholesale channels can cross-reference directly to CM39820 for catalog integration.