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Details
| Specification | Value |
|---|---|
| Brand | RAP BRAKES |
| MPN | r-m0178 |
| Category | Master brake cylinder |
| Thread Size | 12 X 1 (2) |
| Brake System | ATE |
| Piston Diameter [mm] | 25.4 mm |
OE numbers (4)
Search by this OE number to find compatible parts
- AUDI / VW—8E0611021A
- SEAT / SKODA / VW—8E0611021B
- SKODA—8E0612105L
- AUDI / SEAT / SKODA / VW—8E0612105N
Where this part fits
Original-fit position for OE 8E0611021A. The red ring marks where this part installs on the vehicle.
About this product
RAP BRAKES Master brake cylinder (R-M0178) is manufactured to OEM tolerances, ensuring a direct-fit replacement that restores your vehicle to factory specification without any modification. Technical specifications — Thread Size: 12 X 1 (2), Material: Steel, Brake System: ATE, Piston Diameter [mm]: 25, Copper mm — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Compatible with AUDI, SEAT, SKODA, VW vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 03.2125-0026.3, 03.2125-0373.3, 05-0613, 0986481072 and 26 more. Matching these numbers confirms a like-for-like replacement with no loss of function. RAP BRAKES 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
Equivalent products (27)
Show all 27 OE numbers
Master brake cylinder RAP BRAKES R-M0178 — compatible car models
| Car models | AUDI: A4 B5 Avant (8D5), A4 B6 (8E2), A4 B6 Avant (8E5), A4 B6 Convertible (8H7), A4 B7 (8EC), A4 B7 Avant (8ED), A4 B7 Convertible (8HE), A6 C5 (4B2, 4B4), A6 C5 Avant (4B5, 4B6), ALLROAD C5 (4BH); SEAT: EXEO (3R2), EXEO ST (3R5); SKODA: SUPERB I (3U4); VW: PASSAT B5 (3B2), PASSAT B5.5 (3B3), PASSAT B5.5 Variant (3B6), PASSAT B5 Variant (3B5) |
|---|---|
| Engines | 1.6; 1.8 T; 1.8; 2.5 TDI quattro |
| Year of manufacture | 1994-2013 |
| Manufacturer article number (MPN) | R-M0178 |
| OE part numbers | 8E0611021A, 8E0611021B, 8E0612105L, 8E0612105N |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
RAP BRAKES r-m0178 Master brake cylinder. Brake System: ATE. Material: 1. Piston Diameter [mm]: 25,4 mm. Thread Size: 12 X 1 (2)
- 1x Master brake cylinder
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 Master brake cylinder compatible with my car?
This Master brake cylinder fits AUDI, SEAT, SKODA, VW 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 RAP BRAKES Master brake cylinder have?
This RAP BRAKES Master brake cylinder has the following specifications: Thread Size: 12 X 1 (2); Material: 1; Brake System: ATE; Piston Diameter [mm]: 25,4 mm. Check the full specifications table above for complete details.
What OE part numbers does this Master brake cylinder replace?
This Master brake cylinder replaces OE part numbers: 8E0611021A, 8E0611021B, 8E0612105L, 8E0612105N. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Master brake cylinder cost?
This RAP BRAKES Master brake cylinder is available for £33.99. Master brake cylinder prices vary depending on brand, specifications, and vehicle compatibility. RAP BRAKES parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Master brake cylinder?
Regular inspection of your Master brake cylinder 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 brake cylinder?
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 brake cylinder fitted by a professional mechanic.
Can I use this part as a replacement for OE 8E0611021A?
Yes, this RAP BRAKES Master brake cylinder is a direct replacement for OE part number 8E0611021A. 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.
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