Experiencing a flashing ABS light on your 1998 BMW K1200RS after a rear disc replacement? This is a common issue, and it’s often related to the sensitive ABS system on this model. While the 1998 BMW K1200RS utilizes an earlier ABS2 system, understanding potential fault codes and troubleshooting steps is crucial for maintaining your bike’s safety and performance. Let’s explore how to diagnose and potentially resolve this ABS fault, focusing on the key area of the rear ABS sensor.
Diagnosing ABS Faults on a 1998 BMW K1200RS
The ABS2 system on your 1998 K1200RS is known for its sensitivity, particularly concerning the gap between the ABS sensor and the ABS ring. Unlike later BMW motorcycle models, the ABS2 system has a very narrow tolerance range for this sensor gap. After performing work near the rear wheel, such as a disc change, it’s essential to check this gap as it’s a frequent cause of ABS fault lights.
Checking the Rear ABS Sensor Gap
A primary step in troubleshooting your flashing ABS light is to inspect and measure the rear ABS sensor gap. This gap should be within the range of 0.45 to 0.55 mm (0.020 to 0.022 inches) for ABS2 systems. To accurately check this:
- Remove the rear wheel: This provides easier access to the sensor and ABS ring.
- Locate the ABS sensor: It’s mounted near the rear caliper and positioned to read the ABS ring on the brake disc.
- Measure the gap: Use feeler gauges to measure the distance between the sensor tip and the ABS ring teeth. Take measurements at least at three points, approximately 120 degrees apart on the ring, to ensure consistency.
Image: A detailed view of the rear caliper and ABS sensor on a BMW K1200RS, highlighting the sensor’s position relative to the ABS ring for gap inspection.
If your measurements fall outside the specified range, you may need to adjust the sensor position. BMW provides shims of varying thicknesses to help achieve the correct gap. Adjusting the gap often requires removing the sensor from its mounting on the caliper.
Resetting ABS Fault Codes on your K1200RS
It’s important to note that the ABS2 system on the 1998 BMW K1200RS is known to retain fault codes even after the underlying issue has been resolved. Therefore, even after correcting the sensor gap or any other potential problem, the ABS light may continue to flash until the fault codes are cleared.
To reset these codes, you will typically need:
- GS911 Diagnostic Tool: This aftermarket tool is popular among BMW motorcycle owners for diagnosing and resetting fault codes.
- Dealer Diagnostic Computer: A BMW dealership service department can also reset the codes using their proprietary equipment.
- Manual Reset Procedure: While less common and potentially more complex, there are reported methods involving grounding a specific pin on the ABS connector to reset the system. Consult your service manual for detailed instructions if considering this method.
Consult the Clymer Service Manual for BMW K1200RS
For detailed procedures and specifications related to your 1998 BMW K1200RS ABS system and general maintenance, the Clymer service manual is an invaluable resource. It provides step-by-step guidance, including torque specifications and troubleshooting tips, essential for DIY maintenance and repairs.
In conclusion, if you’re facing a flashing ABS light after a rear disc change on your 1998 BMW K1200RS, begin by meticulously checking the rear ABS sensor gap. Ensure it meets the specified range for the ABS2 system. Following any necessary adjustments, remember to reset the ABS fault codes using a compatible diagnostic tool to fully resolve the issue. Consulting your Clymer manual will provide further detailed guidance throughout this process.
