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HOMESERVICE MANUALSMERCURY1971CYCLONE BASE, 7.0L ENG VIN J, AUTOMATIC TRANS, TRANS MFR CD FMXREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONBRAKESANTI-LOCK BRAKE SAFETY PRECAUTIONS - GENERAL INFORMATIONANTI-LOCK BRAKE SAFETY PRECAUTIONS
1971 Mercury Cyclone Base, 7.0L Eng VIN J, Automatic Trans, Trans Mfr CD FMX

Anti-Lock Brake Safety Precautions

1971 Mercury Cyclone Base, 7.0L Eng VIN J, Automatic Trans, Trans Mfr CD FMXSECTION Anti-Lock Brake Safety Precautions
WARNING: Failure to depressurize ABS 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.
  • DO NOT  attempt to bleed hydraulic system without first referring to the appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section.
  • Only use specially designed brake hoses/lines on ABS equipped vehicles.
  • DO NOT  tap on speed sensor components (sensor, sensor rings). Sensor rings must be pressed into hubs, NOT hammered into hubs. Striking these components can cause demagnetization or a loss of 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 transmission 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.