OEM Clutch Slave Cylinder for Mazda B-Series & BT-50 – OE UB39-41-920 | XUI4118A

CM246

Technical Specifications Table

Parameter	Details
Xusen Part No.	XUI4118A
OE Reference No.	UB39-41-920
Cross Reference	CM246
Compatible Make	Mazda
Compatible Models	B1600 / B1800 / B2000 / B2200 / B2500 / B2600 / B2900 / BT-50
Vehicle Type	Light Commercial Pickup Truck
Compatible Years	1985 – 2012 (manual transmission variants)
Transmission Type	Manual
Component Type	External Clutch Slave Cylinder
Seal Material	EPDM (DOT 3 / DOT 4 compatible)
Quality Standard	ISO 9001 / TS16949
Packaging	Neutral / OEM / Private Label

 

What Is a Clutch Slave Cylinder — and How Is It Different from the Master Cylinder?
If the clutch master cylinder is the “pump” (it creates hydraulic pressure when you press the pedal), then the slave cylinder is the “actuator” — it receives that pressure and converts it back into physical movement to push the release bearing or fork, disengaging the clutch plate from the flywheel.

The two parts work as a pair but wear independently.
A failed slave cylinder typically shows up as a clutch pedal that goes to the floor without resistance, or a clutch that won't fully disengage — causing grinding when changing gears.
Unlike the master cylinder, the slave cylinder is mounted near the gearbox, where it's exposed to heat, vibration, and road contamination — making it a more frequent replacement item in commercial use.

Why the Mazda B-Series Is a Catalogue Staple
The Mazda B-Series is not a niche product.
It's one of the most enduring light pickup truck platforms in history, produced across multiple generations from the mid-1980s through the mid-2000s, and sold under both Mazda and Ford badges (as the Ford Courier and Ford Ranger in several markets).

The BT-50 continued the lineage into the 2010s.
This means a single OE number — UB39-41-920 — covers an exceptionally wide vehicle population across Southeast Asia (Thailand, the Philippines, Indonesia), East and Southern Africa, South America (Chile, Colombia, Peru), and the Middle East.
For distributors managing a commercial vehicle parts catalogue, this is exactly the type of high-breadth, steady-demand SKU that justifies stocking.

What Buyers Look for in a Slave Cylinder — and What XUI4118A Delivers
Seal integrity under heat — the slave cylinder's EPDM seals must withstand sustained temperatures near the gearbox and resist swelling or hardening from brake fluid. EPDM performs better than standard rubber at elevated temperatures and maintains dimensional stability across a wider operating range.
One SKU, eight model lines — XUI4118A covers B1600 through BT-50 under a single part number, reducing your catalogue complexity and warehouse SKU count without sacrificing fitment accuracy.
External mount design — this is an external slave cylinder (not a concentric type), meaning installation and future replacement require standard tools only — a significant practical advantage for repair workshops in markets without specialist equipment.
Private label packaging — available in neutral or fully customised packaging to suit your brand and destination market.

Q1: What's the difference between an external and a concentric (internal) slave cylinder?
An external slave cylinder mounts on the outside of the gearbox bell housing and connects to the release fork via a pushrod.
A concentric slave cylinder fits inside the bell housing around the input shaft.
The Mazda B-Series uses an external design, which is more accessible for servicing and replacement — especially relevant for markets without specialist workshop tooling.

Q2: Should the master cylinder and slave cylinder be replaced at the same time?
Not necessarily — they fail independently and should be diagnosed separately.
However, many distributors stock both together as a kit, since when one fails, the other is often nearing end of life.
Xusen manufactures both components; ask us about paired part numbers if you want to offer a kit option in your catalogue.

Q3: How do I confirm which B-Series variant a customer has?
The OE number UB39-41-920 applies consistently across B1600, B1800, B2000, B2200, B2500, B2600, B2900, and early BT-50 manual variants.
If a customer provides their OE number and it matches, fitment is confirmed.
If they only have a chassis number, cross-reference with a Mazda parts catalogue or VIN decoder.

Q4: Does this part also fit Ford Courier or Ford Ranger versions sold in some markets?
The Mazda B-Series platform was shared with the Ford Courier and early Ford Ranger in several markets (Australia, South Africa, Thailand).
Cross-fitment depends on the specific year and market variant.
We recommend confirming via OE number match before ordering for Ford-badged vehicles.

Q5: What documentation is available for customs and import compliance?
We provide ISO 9001 / TS16949 quality certificates, factory test records, and material declarations per order.
For specific import markets with additional documentation requirements, let us know in advance so we can prepare the relevant paperwork.