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 MANUALSCHEVROLET1987HI-CUBE 6.2 J, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (ANTI-LOCK BRAKE SYSTEM - 4-WHEEL)
1987 Chevrolet Hi-Cube 6.2 J, 400/M40
Section 39 (Anti-Lock Brake System - 4-Wheel)
1987 Chevrolet Hi-Cube 6.2 J, 400/M40SECTION Section 39 (Anti-Lock Brake System - 4-Wheel)
WARNING: This page does not describe the selected car, but rather 58 other vehicles, including the 1992 Oldsmobile Bravada, 1992 GMC Yukon, 1992 GMC Suburban, 1992 GMC Sonoma, and 1992 GMC Safari. However, it is still accessible from the selected car via links, so may be relevant.
- Description
- Operation
- Bleeding Brake System
- Diagnosis & Testing
- Trouble Shooting Charts
- Notes
- Diagnostic Circuit Check
- Antilock Light On/Off
- Brake Pedal Pulses
- Wheel Pull During Hard Braking
- Code 21, 25, 31 Or 35 - Speed Sensor Failure Or Open Circuit
- Code 22, 26, 32 Or 36 - Missing Speed Signal
- Code 23, 27, 33 Or 37 - Erratic Speed Sensor
- Code 28 - Erratic Speed Sens Sig (2 Drop-Outs Above 20 Mph)
- Code 29 - Simultaneous Dropout Of All Speed Sens Above 8 Mph
- Code 35 - Speed Sens Failure Or Open CKT ("C" & "K" Series)
- Code 37 - Erratic Speed Sensor Signal ("C" & "K" Series)
- Code 38 - Speed Sensor Error
- Codes 41-54 - Control Valves
- Code 61, 62 Or 63 - Reset Switches
- Code 65 Or 66 - Pump Motor Relay Open Or Shorted
- Codes 67 Or 68 - Pump Motor Malfunction Or Ecu Output Shorted
- Codes 71-74 - Memory Errors
- Code 81 - Brake Switch Circuit Open Or Shorted
- Code 86 - Antilock Light Shorted
- Code 88 - Brake Light Shorted
- Removal & Installation
- Adjustments
- Torque Specifications
- Wiring Diagrams
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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.