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HOMESERVICE MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMSAFETY PRECAUTIONS
1990 Pontiac Grand Prix STE, 3.1 V

Safety Precautions

1990 Pontiac Grand Prix STE, 3.1 VSECTION Safety Precautions
WARNING: Failure to depressurize ABS before servicing brake system could lead to physical injury.
  • NEVER  open a bleeder valve or loosen a hydraulic line while ABS is pressurized.
  • NEVER  disconnect or reconnect any electrical connectors while ignition is on. Damage to ABS control unit may result.
  • ONLY  use specially designed brake hoses/lines on ABS equipped vehicles.
  • DO NOT  tap on speed sensor components (sensor, sensor rings). Speed rings must be pressed into hubs, NOT hammered into hubs. Striking these components can cause demagnetization or polarization, affecting the accuracy of the speed signal returning to the ABS control unit.
  • DO NOT  mix tire sizes. Increasing the width, as long as tires remain close to the original diameter, is acceptable. Rolling diameter must be identical for all 4 tires. Some manufacturers recommend tires of the same brand, style and type. Failure to follow this precaution may cause inaccurate wheel speed readings.
  • DO NOT  contaminate speed sensor components with grease. Only use recommended coating, when system calls for an anti- corrosion coating.
  • When  speed sensor components have been removed, ALWAYS check sensor-to-ring air gaps when applicable. These specifications can be found in each appropriate article.
  • ONLY  use recommended brake fluids. DO NOT use silicone brake fluids in an ABS equipped vehicle.
  • When  installing transmitting devices (CB's, telephones, etc.) on ABS equipped vehicles, DO NOT locate the antenna near the ABS control unit (or any control unit).
  • Disconnect  all on-board computers, when using electric welding equipment.
  • DO NOT  expose the ABS control unit to prolonged periods of high heat (185°F/85°C for 2 hours is generally considered a maximum limit).
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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.