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Problem: Potential safety risk and possible component damage

Cause: Not adhering to proper safety precautions when servicing ABS equipped

 

Solution:

• NEVER open a bleeder valve or loosen a hydraulic line while ABS is pressurized. The accumulator must be depressurized in accordance with individual manufacturer’s repair instructions.

• 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 onto hubs, NOT hammered onto hubs. Striking these components can cause demagnetization or polarization, affecting accuracy of speed signal returning to 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 over tighten wheel lug nuts. Bent rotor or brake drum may occur, which can lead to inaccurate wheel speed readings.

• DO NOT contaminate speed sensor components with grease. Only use recommended coating when system calls for an anticorrosion 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, bluetooth, 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. Alternate method: Place welding clamp as close to work as possible.

• 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).

• Do not disconnect the battery to clear codes. This only works on a small number of vehicles.

• Do not overfill the brake fluid reservoir. Follow manufacturers instructions.

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