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 "A": SYSTEM FUNCTION CHECK
1990 Buick Regal Custom, 3.8 L, 4T60/ME9
Abs-III Function Check "A": System Function Check
1990 Buick Regal Custom, 3.8 L, 4T60/ME9SECTION Abs-III Function Check "A": System Function Check
NOTE:
An assistant is required to perform ABS-III System 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. Rotate each wheel. All wheels should rotate.
- Have assistant apply medium pressure to brake pedal. Wheels should not rotate. If front wheels rotate, bleed hydraulic system. See BLEEDING BRAKE SYSTEM .
- If front wheels still rotate after bleeding system, replace Powermaster-III. If rear wheels rotate, see ABS-III FUNCTION CHECK "C". If wheels do not rotate, proceed to next step.
- With medium pressure applied to brake pedal, instruct assistant to energize the HOLD and RELEASE solenoids with scanner (Release Function on ABS-III function check menu). Rotate each wheel as its solenoid is energized. Wheel should rotate. Slight drag is okay.
- If wheel does not rotate, brake pedal fades to floor, or pump runs unacceptably, check wiring harness and corresponding solenoid's connector. If wiring harness and connector are okay, replace solenoid and repeat step 3). If condition persists, 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.