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Details
| Specification | Value |
|---|---|
| Brand | Borsehung |
| MPN | b12539 |
| Category | brake fluid reservoir |
OE numbers (2)
Search by this OE number to find compatible parts
- BMW—34336873446
- BMW—34336881095
Where this part fits
Original-fit position for OE 34336881095. The red ring marks where this part installs on the vehicle.
About this product
Sourced from Borsehung, this brake fluid reservoir (B12539) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Verified to fit BMW 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: 34336873446, 34336881095. Matching these numbers confirms a like-for-like replacement with no loss of function. Borsehung is a recognised supplier of automotive braking 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
No equivalent parts found.
brake fluid reservoir Borsehung B12539 — compatible car models
| Car models | BMW: 5 (G30, F90), 5 Touring (G31), 5 Touring Van (G31), 6 Gran Turismo (G32), 7 (G11, G12), X3 (G01, F97, G08), X3 Van (G01), X4 (G02, F98) |
|---|---|
| Engines | 518 d; 520 d xDrive; 620 d; 725 d, Ld; sDrive 18 d; xDrive 20 d |
| Year of manufacture | 2015-2022 |
| Manufacturer article number (MPN) | B12539 |
| OE part numbers | 34336873446, 34336881095 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
Borsehung b12539 brake fluid reservoir
- 1x brake fluid reservoir
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Tracked standard shipping.
- Standard delivery: 5–9 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 brake fluid reservoir compatible with my car?
This brake fluid reservoir fits BMW 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 Borsehung brake fluid reservoir have?
The package includes the brake fluid reservoir as described in the specifications above. Check the "What's included" section for a full list of components. If mounting hardware or accessories are required, they will be listed separately.
What OE part numbers does this brake fluid reservoir replace?
This brake fluid reservoir replaces OE part numbers: 34336873446, 34336881095. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a brake fluid reservoir cost?
This Borsehung brake fluid reservoir is available for £90.99. Brake fluid reservoir prices vary depending on brand, specifications, and vehicle compatibility. Borsehung parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my brake fluid reservoir?
Regular inspection of your brake fluid reservoir 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 brake fluid reservoir?
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 brake fluid reservoir fitted by a professional mechanic.
Can I use this part as a replacement for OE 34336873446?
Yes, this Borsehung brake fluid reservoir is a direct replacement for OE part number 34336873446. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
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