EURORELIC

34 31 7 838 638 –Brake master cylinder – Z4 M (S54)

Available newchecked 2026-10-08source: bmwpartsdeal.commarket: US+EU

BMW part number 34 31 7 838 638 (34317838638) is the Brake master cylinder – Z4 M (S54), a brakes part catalogued for the E85 (Z4 M3.2), E86 (Z4 M3.2). As of our last check (2026-10-08, bmwpartsdeal.com), it is still available new from BMW. Interchange records list it on E46 as well.

⚠ Safety-critical part. Have a qualified mechanic verify fitment and installation before driving.
  1. 1 New from BMW
    Listed as orderable new by the status source.
  2. 2 Aftermarket new
    No sourced aftermarket equivalent yet
  3. 3 Used / NOS
    Search live listings on eBay US/DE.
  4. 4 Interchange
    Same BMW number listed on 1 other chassis
  5. 5 Kit / reman
    None recorded yet
  6. 6 Community fix
    No forum workaround recorded yet
  7. 7 DIY guide
    No guide yet
  8. 8 Paid hunt
    We search dealers, breakers and forums for you.

Buy new

Listed as orderable new at bmwpartsdeal.com when checked.

  • 🇺🇸 USAvailable newbmwpartsdeal.com
  • 🇪🇺 EuropeAvailable newLeebmann24 (DE): "3-4 Working Days" €656.77 (our Leebmann24 lookup of 2026-09-28)leebmann24.com
View 34317838638 at bmwpartsdeal.comCross-reference 34317838638 on RealOEMCatalog diagram (bmwfans.info)

Aftermarket options (0)

No sourced aftermarket equivalent recorded yet. We only list brand numbers that a brand catalog or vendor page explicitly cross-references to this BMW number.

Where to buy

Every link opens 34317838638 at that seller: “View” = the part’s own page, “Look up” = the seller’s part-number page, “Search” = the seller’s search pre-filled with the number. You can order from either region.

United States

Europe (DE · UK · DK)

“Ships internationally” is shown only where we read it on the vendor’s own shipping page (checked 2026-09-28); otherwise check with the vendor. Import duties and taxes are the buyer’s responsibility. Amazon links carry our Associates tag, so we may earn a commission; other seller links are not affiliate links today.

Used & NOS listings

Cross-model interchange (2)

Listed directly for E85 and E86 in our data (see Fits). Models below are other listings of the same number.

Same part numberCatalog matchbmwfans.info

Same BMW part number listed for this model in catalog data. Not a physical fit test.

E46
M3 S54M3 CSL S54

Community fixes (0)

No forum workaround recorded yet. If you know a thread, the hunt team wants to hear about it.

Kits, reman & retrofits (0)

No kit or reman service recorded yet.

DIY

No DIY route recorded yet.

Repair guides & how-tos (0)

No repair write-up or video linked for this part yet.

Notes & sources

Listed $661.24 on bmwpartsdeal. SAFETY-CRITICAL (brakes/steering/fuel/airbag): have a qualified mechanic verify fitment and installation.