Brake Caliper Slide Pin Seized
What does C0279 mean?
The C0279 code means the vehicle's onboard diagnostic system has detected: Brake Caliper Slide Pin Seized. This is a moderate severity code.
Common Symptoms
- Vehicle pulls to one side during braking
- Uneven brake pad wear
- Burning smell from one wheel area
- One wheel hotter than others after driving
- Brake dragging on one corner
Probable Causes (Ranked by Likelihood)
- Corroded or seized caliper slide pins Very High
- Dry or degraded slide pin boots High
- Contaminated slide pin grease Moderate
- Damaged caliper bracket bore Low
Step-by-Step Diagnostic Procedure
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Check each wheel for excessive heat after driving
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Remove caliper and check slide pin movement
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Inspect slide pin boots for tears or cracking
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Compare brake pad wear between inner and outer pads
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Check caliper for free movement on bracket
Frequently Asked Questions
What are caliper slide pins?
Slide pins are metal bolts that allow the brake caliper to float and center itself over the rotor. They slide in and out of rubber boots filled with grease to maintain smooth movement.
How often should slide pins be lubricated?
Slide pins should be cleaned, inspected, and re-greased every time brake pads are replaced. Many technicians recommend checking them during every brake inspection.
Can seized slide pins damage other components?
Yes. A seized pin causes the caliper to apply unevenly, leading to accelerated pad wear on one side, rotor warping from heat buildup, and potential wheel bearing damage from excess heat.