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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLPOWER BRAKE ASSISTTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCHECKING FUNCTION OF POWER FLOW REGULATOR
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Checking Function of Power Flow Regulator
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Checking Function of Power Flow Regulator
CHECKING FUNCTION OF POWER FLOW REGULATOR:
- Start engine. Pressure continues rising up to the upper switching off pressure.
Upper switching off pressure = 52-57 bar (764-838 lb sq in).
- Drop the reservoir pressure (pressure gage) to switching on pressure by operating the brake pedal with the engine running.
Lower switching on pressure = 36-41 bar (529-603 lb sq in).
Afterwards the power flow regulator switches again to "charging reservoir" (pressure rises again). If test values are not reached, replace the power flow regulator.
- With engine off, drop the reservoir pressure (pressure gage) to zero by operating the brake pedal about 20 times.
- Remove pressure tester and check oil level in supply tank.
RENDER: 1.0x
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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.