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Details
| Specification | Value |
|---|---|
| Brand | SAMKO |
| MPN | f04391 |
| Thread Size | 7 /16 20 UNF |
| Brake System | TRW |
| Distance of mounting bores [mm] | 57 mm |
| Piston Diameter [mm] | 15.87 mm |
OE numbers (2)
About this product
The SAMKO Master Cylinder Clutch (F04391) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: Thread Size: 7 /16 20 UNF, Material: Steel, Brake System: TRW, Distance of mounting bores [mm]: 57 mm, Piston Diameter [mm]: EPDM, 87 mm. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Verified to fit TRIUMPH models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 138928, 2506, 4002147, 6223399 and 11 more. Matching these numbers confirms a like-for-like replacement with no loss of function. SAMKO is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
Suitable cars
Equivalent products (15)
Master Cylinder Clutch SAMKO F04391 — compatible car models
| Car models | TRIUMPH: DOLOMITE (W, TW) |
|---|---|
| Engines | 1300 |
| Year of manufacture | 1972-1981 |
| Manufacturer article number (MPN) | F04391 |
| OE part numbers | 138928, GMC1023 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
SAMKO f04391 . Brake System: TRW. Distance of mounting bores [mm]: 57 mm. Material: 1. Piston Diameter [mm]: 15,87 mm. Thread Size: 7 /16 20 UNF
- 1x Master Cylinder Clutch
Shipping, returns, warranty
Free UK delivery on orders over £50.00. Tracked standard shipping.
- Standard delivery: 4–8 business days
- Order before 5pm — ships the next working day
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Master Cylinder Clutch compatible with my car?
This Master Cylinder Clutch fits TRIUMPH vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this SAMKO Master Cylinder Clutch have?
This SAMKO Master Cylinder Clutch has the following specifications: Thread Size: 7 /16 20 UNF; Material: 1; Brake System: TRW; Distance of mounting bores [mm]: 57 mm; Piston Diameter [mm]: 15,87 mm. Check the full specifications table above for complete details.
What OE part numbers does this Master Cylinder Clutch replace?
This Master Cylinder Clutch replaces OE part numbers: 138928, GMC1023. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Master Cylinder Clutch cost?
Master Cylinder Clutch prices vary depending on brand, specifications, and vehicle compatibility. Check the current price above for this SAMKO Master Cylinder Clutch. All parts come with our 14-day money-back guarantee.
How do I know when to replace my Master Cylinder Clutch?
Regular inspection of your Master Cylinder Clutch is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Master Cylinder Clutch?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Master Cylinder Clutch fitted by a professional mechanic.
Can I use this part as a replacement for OE 138928?
Yes, this SAMKO Master Cylinder Clutch is a direct replacement for OE part number 138928. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
