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 DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGABS-III FUNCTION CHECK "B": HOLD FUNCTION CHECK
1990 Buick Regal Custom, 3.8 L, 4T60/ME9
Abs-III Function Check "B": Hold Function Check
1990 Buick Regal Custom, 3.8 L, 4T60/ME9SECTION Abs-III Function Check "B": Hold Function Check
- Attach Tech I (94-00101-A) scanner. Raise vehicle with assistant in driver's seat. Turn ignition on and put transmission in Neutral. Instruct assistant to energize the rear hold solenoids with scanner (Rear Hold Function on ABS-III function check menu). Apply medium pressure to service brake.
- Note pedal travel and pump operational pattern while solenoid is energized. Rear wheel should turn freely for 6 seconds before brake begins application. If brake applies in 5 seconds or less, brake pedal fades to floor, or pump runs excessively, replace Powermaster-III rear solenoid. If problem persists, replace Powermaster-III. If okay, proceed to next step.
- Instruct assistant to moderately apply brakes. Energize front HOLD solenoids with scanner (Front Hold Function on ABS-III function check menu). Brake fluid spraying within reservoir should not be heard. Apply medium pressure to service brake.
- Wheel should turn freely for 6 seconds before brake begins application with only driveline resistance. If brake applies in 5 seconds or less, brake pedal fades to floor, or pump runs unacceptably, replace appropriate solenoid in Powermaster-III. If condition continues, replace Powermaster-III.
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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.