Renault Clio I, Clio II & Thalia Brake Wheel Cylinder Replacement – 7701047838

CM246

Item	Detail
Application	Renault Clio I (B/C57_, 5/357_), Clio II (BB_, CB_), Clio II Box (SB0/1/2_), Thalia I (LB_)
OE No.	7701047838, 6001549726
Other Reference	CR.645
Bore Diameter	17.46mm
Mounting Size	Φ19.5/M6x1
Port/Connecting Size	M10 x 1.0, M7 x 1
Packaging	Neutral box or custom OEM/ODM branding
Certifications	ISO 9001, IATF 16949, VDA6

A Wheel Cylinder That Outlasted Three Vehicle Generations
The OE number 7701047838 attached to this wheel cylinder shows up against a wider range of vehicles than the application list alone suggests. Beyond the Clio I, Clio II, Clio II Box and Thalia I covered here, the same physical specification carries forward into the Clio III, Clio IV, Dacia Sandero and Dacia Logan II in Renault's own parts documentation. That continuity across nearly three decades of model changes is unusual — most rear drum brake hardware gets redesigned at least once when a manufacturer moves to a new platform generation. Renault kept this dimension stable instead, which means a distributor stocking the XUI2831A is effectively holding inventory relevant to vehicles spanning the early 1990s through to current Dacia production.

A Simpler Mounting Pattern Than Other Renault Wheel Cylinders
The mounting size for this part — Φ19.5/M6x1 — is a single bolt circle with one thread spec, compared to the two-hole Φ31.5/32/2-M6x1 mounting pattern used on the Logan/Twingo wheel cylinder or the Φ31.8/25/2-M6x1 pattern on the older Renault 21. This is not a different design tier; it reflects a different backing plate attachment method used on the Clio/Thalia rear axle versus the larger Renault saloon platforms. Buyers should not read the simpler mounting spec as a sign this is a lower-grade part — it is simply a different fixing method appropriate to this axle design, and it has been retained across multiple Renault generations precisely because it works.

Reading the OE and Cross-Reference Numbers
7701047838 and 6001549726 represent Renault's two parallel numbering prefixes again, the same "77 01" and "60 01" pattern seen elsewhere in Renault's catalog system. CR.645 is an aftermarket cross-reference code used by several European brake parts brands to index the identical specification. Distributors will also find this same physical part listed under Brembo, Delphi, FTE and other aftermarket brand catalog numbers, since this is one of the more heavily multi-sourced wheel cylinders in the Renault range due to its broad vehicle coverage.

Compatibility
This wheel cylinder fits the Renault Clio I (B/C57_, 5/357_), Renault Clio II (BB_, CB_), Renault Clio II Box (SB0/1/2_) and Renault Thalia I (LB_).

Why Distributors Treat This as a Core Stock Item
Because this specification spans the Clio I through Clio IV generations and into current Dacia Sandero and Logan II production, distributors covering Renault and Dacia in any market treat this as one of the highest-turnover wheel cylinders in their catalog rather than a niche fitment. Workshops servicing a mixed fleet of older and newer Renault/Dacia vehicles can use this single part number across a disproportionately large share of their rear brake jobs.
OEM/ODM private label packaging available for distributors building a Renault/Dacia brake parts range.

Confirming Fitment for Mixed Clio/Thalia Inventory
Since the application spans the B/C57_ and 5/357_ chassis codes for Clio I alongside the BB_/CB_ codes for Clio II, distributors stocking parts for both generations side by side should verify chassis code against the customer's vehicle registration rather than assuming model year alone determines which generation a given Clio belongs to, since Clio I production overlapped with early Clio II sales in some markets.

Q1: Does this same wheel cylinder really fit newer Clio III, Clio IV or Dacia Sandero models?
The 7701047838 specification carries forward into those later models in Renault's own documentation, though this application list is specifically confirmed for Clio I, Clio II, Clio II Box and Thalia I — verify against the OE number for newer models before ordering.

Q2: Why does this wheel cylinder have a simpler one-hole mounting pattern than other Renault wheel cylinders?
The Φ19.5/M6x1 single-bolt mounting reflects the backing plate design used on the Clio/Thalia rear axle, which differs from the two-hole pattern used on larger Renault platforms like the 21 or the Logan/Twingo line. It is a different fixing method, not a lower-spec design.

Q3: I see different aftermarket brand numbers for what looks like the same part — is that normal?
Yes. This specification is multi-sourced by several aftermarket brands including Brembo, Delphi and FTE, each with their own catalog numbering, alongside the CR.645 cross-reference and the Renault OE numbers.

Q4: How do I tell whether a customer's vehicle is a Clio I or early Clio II if the production years overlap?
Check the chassis code on the vehicle registration document — B/C57_ or 5/357_ indicates Clio I, while BB_ or CB_ indicates Clio II — rather than relying on the model year alone.

Q5: Given how many vehicles this part covers, is it a high-volume or niche item for distributors?
High-volume. Because the specification spans Clio I through Clio IV and current Dacia production, this is typically one of the faster-moving wheel cylinder SKUs in a Renault/Dacia parts catalog rather than a slow-moving niche listing.