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ABS Diagnostic Equipment

Antilock brake systems run self-diagnostic tests when the vehicle is driven to check for faults. If a fault is detected, it will usually set a code and turn on the ABS warning light to alert the driver.

Tech Tip: Scan Tools Needed for Some ABS, ESC and A/C Service

Some new technologies may require the use of scan tools to service them – in unexpected ways. A scan tool may be necessary when servicing vehicles equipped with ESC (Electronic Stability Control), for instance, even with simple service such as an alignment. This scan tool helps perform the steering center calibration, which, if not performed correctly, can result in the vehicle pulling to one side or the other.

Bleeding ABS Brake System: Why Brake Fluid and Lines Degrade

According to R. L. Polk, the average age of the vehicles on U.S. roads was 9.2 years in 2007 with 41 percent of the vehicles 11 years or older. This high median age is a good reason to consider the condition of the brake fluid and bleeding procedures when performing maintenance or repairs. Maintenance or repair of an Anti-lock Brake System (ABS) system can require the opening of the hydraulic system. Any time the hydraulic system is opened, air can be introduced into the lines and components.

Tech Tip: Mercedes-Benz Suspension/ABS-Steering Angle Sensor Service

For Model 163 vehicles, including the 2003 ML 350, ensure WIS document AR46.10-P-0400GH is followed and adhered to when removing and installing the jacket tube. Do not separate the coupling below the steering angle sensor (N49) or damage to the sensor rotor may occur.

Nivomat Shock Absorbers: Self-Leveling Monotube Ride Control Units

The Nivomat Shock Absorber is a self-leveling monotube shock absorber developed by Sachs. Nivomat shocks are used by Chrysler, Ford, General Motors, Jaguar, Kia, Mitsubishi, Saab, Volvo and other OEMs. The system is also available on the GM Suburban and Tahoe as part of ZW7 Premium Smooth Ride Suspension. Replacement units are available from Monroe, ZF Sachs and OES suppliers.

Tech Tip: SKF Offers Part Numbers for Honda Front Wheel Bearing with Integrated ABS Tone Ring

SKF provides part numbers and technical information for double-row angular contact front wheel bearings with a split inner ring. The part numbers noted in this tech tip pertain to specific Honda applications. The distinctive feature of these wheel bearings is that one of the two seals on the bearing has a built-in magnetic impulse wheel.

Reprogramming ABS Controllers

Reflashing undercar controllers is possible at your shop!

Tech Tip: Diagnosing Lit ABS Lamp on Ford Expeditions

Some 1997-1999 Ford Expedition, F-150, F-250 (2WD models only), or 1998-1999 Lincoln Navigator (2WD models only), can exhibit such diverse symptoms as: ABS lamp illumination, false ABS cycling at low speeds, increased brake pedal effort at low speeds, or any combination of the above. These problems all may be caused by an incorrectly installed front wheel speed sensor, a damaged wheel sensor, or a chipped or broken tooth on the tone ring resulting in ….

Tech Tip: Silverado Owner Complains that ABS Light Comes on at 40-50 mph

At speeds over 40-50 mph, the ABS and brake indicators come on, and the fuel and volt gauges sometimes drop low at the same time. The technician had already verified the condition and checked for codes before calling Identifix. He found code C0237 (rear wheel speed signal erratic) stored as a history code, but it had not reappeared for him. Next he road-tested with a scanner, watching the vehicle speed input through the powertrain control module (PCM) and electronic brake control module (EBCM) data. When the ….

Diagnosing Wheel Speed Sensors: WSS, ABS Systems

Some vehicles even compare the wheel speed sensor readings against the vehicle speed sensor (VSS) to make sure all of these sensors are accurate and working correctly.