Abs pumps/modulators from the comfort of your house!

Useful hints when trying to self diagnose a fault with your ABS system:

- Always refer to the appropriate anti-lock service manual before attempting to service any portion of the brake system. Some ABS systems store brake fluid in an accumulator under high pressure. Failure to depressurize these types of anti-lock systems before servicing can cause physical injury! The majority of these ABS systems can be depressurized by simply turning off the ignition and firmly depressing the brake pedal between 20 and 40 times. Check service manual for exact number. Never unplug or reconnect any electrical ABS component with the ignition on. This can cause a current surge and damage one or more of the system components. The ABS pump is the one component that helps stabilize the pressure in an ABS system. Most cars need to be "de-pressurized". There are a few cars out there that have the master cylinder/hydro-boost/ABS pump as a unit. Historic Between 1984-1991 all cars that had an ABS system did not have a diagnose system. In other words once a problem was signalled by the intermittent light it was not pointed as well. The only way to stop the warning light beaming was to disconnect the battery. After 1992 technology made it possible and cars were fitted with under hood diagnostic units. The driver had to simply turn the ignition switch on to KPII and leave the engine off, look under the hood to locate the Diagnostic Link Connector boxes and half of the job was done with maximum precision. All he had to do was refer to a manual to read the code and he could tell what the malfunction was.

Other simple facts and guidelines about the ASB

The operation of the ABS system can often be affected by electrical problems in the vehicle, as well as the ABS system itself.

Underlying conditions that may cause trouble include:

• Low battery charge - A low charge can interfere with the operation of the anti-lock control electronics. • Blown fuses - Check the brake control module fuse, main relay fuse and pump motor fuse. • Corroded/loose connectors - The main relay, fluid level sensor and control module connectors all must be tight and correctly installed. • Water intrusion - The most common causes of excessive harness resistance are water intrusion and corrosion at the sensor to main wiring harness connector. Water intrusion can occur at the sensor can or at the harness connector. • Bad grounds - Check body grounds, especially on the modulator and ABS module.