Which Rear Brake Wear Sensor Fits Mercedes-Benz W211 and W204?
Introduction: The Mercedes-Benz W211 and W204 rear brake wear sensor selection starts with OE 2115401717, rear-only fitment, and a retaining clip that must stay visible in every catalog record.
Matching a rear brake wear sensor to the Mercedes-Benz W211 and W204 starts with one OE number, one axle position, and one retaining clip design. The challenge is catalog accuracy: a wrong chassis row can send a counter clerk to the wrong bin, while a vague row forces a workshop to order on guesswork. W211 and W204 both use a rear sensor under OE 2115401717, so the catalog record should make that number, the rear-only position, and the retaining clip easy to read together. Build the row in the same order every time: start with the OE number, confirm the rear application, capture the clip, add the chassis entries, and check the finished set against the official application list.
How OE 2115401717 Defines the Rear Brake Wear Sensor Application
OE 2115401717 is the number recognized by the parts system, the workshop, and the distributor. In the FREY range it carries item number 780700101. The chassis list, stock bin, pick label, catalog image, and description line all depend on that number. The part is a wear indicator mounted at the rear caliper and rides against the pad. As friction material wears, the probe reaches its trigger point and opens the circuit, which brings up the brake wear warning described in Mercedes-Benz owner’s manuals. The warning only works when the sensor is in the correct position, so the rear axle location is part of the part identity, not an extra note. A front sensor will not substitute for it. The retaining clip is the second identity marker. The sensor body locks into the caliper bracket through the metal clip, which holds the probe at the correct depth against the pad. Technicians often check for that clip before they inspect anything else in the box. When the clip is missing from a catalog description, the buyer cannot separate this part from a plain push-fit design in the same category. Put the clip in the description, the listing title, and the photo set, because counter staff often confirm a rear brake pad wear sensor visually before handing it over. Keep the OE number in the same record as well; a chassis name alone is too broad to identify one sensor. An automotive brake sensor manufacturer can support that consistency by keeping the OE number, rear position, and clip together in the application data.
How W211 and W204 Fitment Changes Catalog Entry and Stock Grouping
W211 and W204 are usually the first entries distributors need. The E-Class W211 and C-Class W204 carry high volumes of rear brake service work, and both sit inside the 2115401717 application range alongside W203, W212, W220, W221, W169, W245, and W166, with Maybach applications in the same range. One SKU therefore has unusual reach, which changes how the catalog row and stock bin should be built. A loose line reading “Mercedes-Benz rear brake wear sensor” does not help at the counter, because the clerk usually starts with the chassis in front of them, not the OE number. Three practices keep the record usable.
• Chassis-level rows under one SKU: Create a separate application row for W211 and for W204 so a chassis lookup returns this sensor immediately, rather than forcing the clerk to search by number while a customer waits.
• One physical bin with a shared pick label: Stock the part once and print the covered chassis range on the bin label so pickers, auditors, and new staff can see why a single bin serves two model lines.
• Separate published application counts: Fitment figures appear as 759 in one catalog record and 766 in another, so keep each figure with the record it belongs to rather than averaging or overwriting them during a migration.
Stock grouping is where this fitment work pays off. Because W211 and W204 draw from the same bin, a distributor can hold one rear sensor depth that covers both E-Class and C-Class rear brake jobs, which is easier to justify than carrying two slow-moving numbers side by side. Maybach applications in the same range add reach without adding a second SKU. Grouping gets sloppy at the edges: a W212, W220, W221, or W166 owner can arrive at the same counter with the same request, and the catalog only serves them well if those chassis rows are written as clearly as the two headline entries. For a car parts manufacturer, this is where application structure matters: one SKU can serve a broad range only when each chassis row remains explicit.
How Bulk Search and Online Catalog Review Reduce Fitment Errors
A distributor may take over a brake sensor category with hundreds of rows, half inherited from a previous owner. Matching chassis names one at a time is slow and easy to mis-key, and one wrong row sends incorrect parts to a workshop. Bulk Search changes the job: the manager loads the OE number list into the catalog tool and compares the returned data with the published application range in one pass, then switches to chassis-number lookup where a customer supplied a model rather than a number. The task becomes a comparison of one list against one authority instead of a memory test spread across a morning. The review step matters as much as the lookup. For every row that comes back under 2115401717, confirm three things before publishing: the position reads rear, the retaining clip is noted, and the chassis list matches what the customer expects to see on the shelf. Rows that return under a different number stay out of this group, even when the vehicle looks similar from the outside. Where a brake wear sensor supplier publishes 759 models in one place and 766 in another, treat the official application list as the determining record and keep the two counts separate until that list resolves them. Repeat the review whenever the range is updated, not only at onboarding. An automotive brake sensor manufacturer can supply cross-reference data, but the distributor still has to verify the chassis rows before they go live.
Conclusion
Once the OE number, rear position, and clip are locked into a catalog record, the W211 and W204 entries become a repeatable data task. FREY lists this rear brake wear sensor as 780700101 under OE 2115401717, covering W211, W204, and the wider Mercedes-Benz and Maybach chassis range, packed individually and supplied from a 100-piece minimum order. As an auto parts manufacturer, we can send the application data behind this SKU so your team can compare it with the rows it plans to publish. Share the intended chassis list, or run the numbers through the online catalog and add them to a quotation request, and confirm final entries against the official application list before they go live.
FAQ
Q: Which rear brake wear sensor number should be matched to Mercedes-Benz W211 and W204?
A: Match OE 2115401717, listed as 780700101. W211 and W204 both sit inside the published application range along with W203, W212, W220, W221, W169, W245, and W166, plus Maybach applications. Match on the OE number first, then confirm the chassis appears in the official application list before publishing the row.
Q: Does OE 2115401717 fit front and rear brake positions?
A: It is a rear-only sensor. The retaining clip is shaped to lock into the rear caliper bracket and hold the probe against the pad. Use it for rear applications only; front brake work uses a different part under a different number, and mixing positions in a catalog leads to returns.
Q: How can a distributor group W211 and W204 applications in a brake sensor catalog?
A: Keep one SKU with separate chassis rows for W211 and W204, stock the part in a single bin, and print the covered chassis range on the pick label so the shared grouping is visible. Keep each published application count with its own record—759 in one and 766 in another—rather than merging them, and confirm the final list against the official application data.
Sources / References
Mercedes-Benz USA Owners Manuals
