Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2805 (FUNCTIONAL DESCRIPTION - F10 - STABILITY CONTROL SYSTEM, TIRE & WHEEL SYSTEM, LUBRICATION SYSTEM)STABILITY CONTROL SYSTEM - FUNCTIONAL DESCRIPTIONDYNAMIC STABILITY CONTROL (DSC)HYDRAULIC SYSTEM DIAGRAM
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
Hydraulic system diagram
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION Hydraulic system diagram
WARNING: This page does not describe the selected car, but rather 45 other vehicles, including the 2016 BMW M5, 2016 BMW 550i xDrive, 2016 BMW 550i, 2016 BMW 535i xDrive, and 2016 BMW 535i. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Explanation |
|---|---|
| 1 | Tandem brake master cylinder |
| 2 | Primary circuit |
| 3 | Secondary circuit |
| 4 | Primary circuit damping volume |
| 5 | Secondary circuit damping volume |
| 6 | Separator valve |
| 7 | Electric changeover valve |
| 8 | Inlet valve, left rear |
| 9 | Outlet valve, right rear |
| 10 | Outlet valve, left rear |
| 11 | Secondary circuit, left rear |
| 12 | Secondary circuit, right rear |
| 13 | Primary circuit, left front |
| 14 | Primary circuit, right front |
| 15 | Outlet valve, front left |
| 16 | Outlet valve, front right |
| 17 | Brake pressure sensor |
| 18 | Inlet valve, right front |
| 19 | Inlet valve, left front |
| 20 | Inlet valve, right rear |
| 21 | Low pressure accumulator |
| 22 | Low pressure accumulator |
| 23 | Electric changeover valve |
| 24 | Separator valve |
| 25 | Primary circuit damping volume |
| 26 | Primary circuit damping volume |
| 27 | Secondary circuit damping volume |
| 28 | Secondary circuit damping volume |
| 29 | Direct current motor |
| 30 | 2-circuit hydraulic pump, secondary circuit |
| 31 | 2-circuit hydraulic pump, primary circuit |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.