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 MANUALSBUICK1990REGAL CUSTOM, 3.8 L, 4T60/ME9REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGABS-III FUNCTION CHECK "E": PUMP RUN TIME INSUFFICIENT
1990 Buick Regal Custom, 3.8 L, 4T60/ME9
Abs-III Function Check "E": Pump Run Time Insufficient
1990 Buick Regal Custom, 3.8 L, 4T60/ME9SECTION Abs-III Function Check "E": Pump Run Time Insufficient
- Depressurize system. With ignition off, pump brake pedal a MINIMUM of 40 times with complete pedal strokes. Remove accumulator and install Pressure Gauge (J-37118). Attach accumulator on gauge. See HYDRAULIC SYSTEM DIAGNOSIS CHART. Bleed Powermaster-III at bleeder valves. Bleed brake system. See BLEEDING BRAKE SYSTEM. Turn on ignition while observing pressure gauge.
- System pressure should quickly rise from zero to 500 psi (35 kg/cm2 ). If pressure is not as specified, replace accumulator. If pressure is okay, allow system to pressurize until pump stops. Apply and hold brake pedal while observing time necessary to activate pump.
- If pump off time is less than 50 seconds, check accumulator precharge. If precharge is less than 600 psi (42 kg/cm2 ), replace accumulator. If precharge exceeds 600 psi, pump off time must increase proportionately. See MINIMUM PUMP OFF TIME table. If pump off time does not increase proportionately, replace Powermaster-III unit.
MINIMUM PUMP OFF TIME
| Accumulator psi | Seconds |
|---|---|
| 600 | 30 |
| 700 | 35 |
| 800 | 40 |
| 900 | 45 |
| 1000 | 50 |
| 1100 | 55 |
| 1200 | 60 |
RENDER: 1.0x
NO RELATED
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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.