Ford Escort & Mazda Clutch Master Cylinder 15.87mm – F1CZ-7A543-A / XUI3107A

CM246

OE Cross Reference Coverage Table

Classification	Part Number References
Ford OE Original Parts	F1CZ-7A543-A, F4CZ-7A543-AA, F7CZ-7A543-AA, 1S4Z-7A543-AA, BC6D-41-990A, BR70-41-990, BR70-41-990A
Mazda OE Original Parts	GJ6A-41-990, GJ6A-41-990A
Aftermarket Replacement Part (Dorman Brand)	CM39820

Buyers sourcing directly against any of these numbers will land on the same specification. This breadth of catalog coverage makes the part findable across Ford, Mazda and Dorman catalog systems simultaneously — relevant for distributors managing multi-brand inventory databases.

Technical Reference Table

Item	Detail
Bore Diameter (DIA)	15.87mm
Mounting Size	Φ28.8/60/45°/Φ9, M8×1.25 bolt
Port/Connecting Size	M10 × 1.0
Packaging	Neutral box or custom OEM/ODM branding
Certifications	ISO 9001, IATF 16949, VDA6

What Is a Clutch Master Cylinder?
The clutch master cylinder sits behind the firewall, connected directly to the clutch pedal. Press the pedal, and it generates hydraulic pressure that travels to the slave cylinder, which physically separates the clutch disc so gears can change. On the Ford Escort, Mazda Protege and Mercury Tracer, a failing master cylinder typically shows up as a spongy or sinking pedal, fluid leaking at the firewall, or a clutch that stops disengaging. The XUI3107A is an OEM-spec replacement for these models, cross-referenced to Ford, Mazda and aftermarket part numbers listed on this page.

Why One SKU Covers Ford, Mazda and Mercury
Ford and Mazda ran a joint engineering partnership for several decades, sharing compact car platforms and hydraulic system components across their separate brand lineups. The Mazda 323, Mazda Protege and Mazda MX-3 were built on the same BG/BJ-family platform, and the Ford Escort and Mercury Tracer were North American badge variants of the same architecture, sharing firewall-mounted clutch hydraulics with the Mazda lineup. The clutch master cylinder bore, mounting geometry and port thread carried across all of these vehicles without change.
The Mazda 6 sits on a different, later platform (GG) but its clutch hydraulic specification remained compatible with the same master cylinder design referenced by these OE numbers. Buyers should verify against the specific OE reference on their application before ordering.
For distributors, the practical result is a single SKU that covers workshops handling Ford Escort, Mercury Tracer and Mazda compact models across three separate decades — genuine inventory consolidation, not just a long fitment list.

Who Orders This Part and Why
North American and European aftermarket distributors are the primary buyers. The Escort and Mazda 323/Protege ran in large volumes through the 1990s, and that vehicle population is now firmly in the high-mileage replacement cycle. Workshops that handle both Ford and Mazda models particularly value a part that covers both with one line item — it reduces ordering complexity and dead stock risk. Parts importers building a Ford-and-Mazda clutch hydraulics range will find the ten-OE-number coverage a strong argument for including this SKU.
OEM/ODM
Custom packaging, label printing and logo branding available for bulk orders. MOQ and lead time confirmed per order.

Addressing Distributor Concerns
Fitment accuracy is the primary concern when sourcing clutch master cylinders for 1990s Ford and Mazda applications. The 15.87mm bore diameter is the critical dimension — it determines hydraulic pressure output and pedal travel. The XUI3107A holds this to OEM tolerance, along with the Φ28.8/60/45°/Φ9 mounting pattern and M10×1.0 port thread, so the part bolts directly to the original bracket and connects to the existing fluid line without modification. Production runs under ISO 9001 and IATF 16949 certified processes with batch inspection records, supporting the traceability requirements of buyers who need documented supply chain evidence for their own wholesale customers. Early failure and warranty returns are the cost items that erode distributor margin fastest — consistent dimensional accuracy is the most direct way to avoid them.

Q1: Does this part fit all listed Ford Escort and Mazda models?
The listed applications use the same clutch master cylinder specification referenced by the OE numbers shown above. Buyers should cross-check against the specific OE number for their year and engine variant before placing a bulk order.

Q2: Why do the Ford and Mazda OE numbers both work for this part?
Ford and Mazda shared compact car platform components through a long-running engineering partnership. The clutch master cylinder specification, including bore, mounting and port thread, was common across both brand lineups on these vehicles.

Q3: What does the 15.87mm bore diameter affect?
The bore diameter directly determines hydraulic pressure output. A bore that is out of spec will produce either insufficient pressure — resulting in incomplete clutch disengagement — or excessive pedal effort. Matching the OEM bore exactly is what makes the pedal feel correct.

Q4: Is Dorman CM39820 the same part?
CM39820 is a Dorman aftermarket catalog reference for the same specification. Buyers cross-referencing from a Dorman catalog will find this part matches that listing.
MOQ and sample terms are confirmed per order — contact us for current details.