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Warning display
Brake warning / Service Brake System: possible causes and documented repairs — 2000–2006 GMC Yukon
Of the records of the 2000–2006 GMC Yukon, 7 state “Brake warning / Service Brake System” (Owner complaint: 5, Recall: 1, Manufacturer communication: 1). The technical documents say how to deal with 3 of its possible causes. They are listed by the number of matching records, most first.
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Causes the technical documents say how to deal with (3)
Brake pipe (brake line) corrosion and rupture
3 matching records
The pipes' steel-copper construction is vulnerable to galvanic corrosion if exposed to the environment.
NHTSA found the failures came with general excessive corrosion over most of the pipe assembly and appear to be expected wear-out of the coating in severe-corrosion states.
How to tell
- Brake warning / Service Brake System
What to do
- In the joint inspections, scaling or flaking corrosion was taken as indicating the onset of metal loss and given the second lowest ranking (2); a leaking or previously repaired pipe was the lowest (1).
- GM noted that pipes with excessive flaking corrosion can only be fully evaluated, including remaining service life, by removing them, cleaning off the corrosion and sectioning them to assess remaining wall thickness.
- The inspections found no specific location where corrosion was visually more severe and no pattern between vehicles.
- Service records of incident vehicles also indicate that repairs are not isolated to a specific location or brake pipe.
6 more steps ·All steps, part numbers and sources (4 sources) →
Unwanted ABS activation at low speed (front wheel speed sensor mounting corrosion)
1 matching record
These vehicles may have a condition permitting corrosion to occur between the front hub/bearing assembly and the wheel speed sensor.
With the brakes applied between about 6 km/h (3.7 mph) and 16 km/h (10 mph), the corrosion may cause unwanted ABS activation.
What to do
- The reading should be at least 350 mV AC; if it is less, the wheel speed sensor must be replaced.
- If the sensor's mounting surface is warped or bent, the sensor must be replaced.
- Dealers remove the sensor, clean its mounting surface on the bearing, apply rust inhibitor and grease, reinstall it and check peak-to-peak output voltage.
- The passage heading states that the repair is cleaning the wheel speed sensor mounting surface.
2 more steps ·All steps, part numbers and sources (4 sources) →
Front right-hand brake pipe contact with body cross sill - recall 00V-345
1 matching record
Clearance between the front right-hand brake pipe and the body cross sill can decrease until they touch.
The brake warning lamp comes on when the fluid level reaches the indicator limit.
How to tell
- Brake warning / Service Brake System
What to do
- Dealers inspect the front right-hand brake pipe for wear.
- A worn section is replaced with a redesigned pipe section; otherwise a spacer clip is installed.
Related symptoms, trouble codes and warning displays
What the technical documents state together with the faults above.
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.