The most common faults in a steering rack typically stem from wear and tear or damage to internal components. Here are the most frequent issues:

1. **Leaking Power Steering Fluid**: One of the most common problems, often caused by worn-out seals or gaskets in the rack and pinion assembly. This can result in fluid loss, leading to a loss of power assist and making steering feel heavy or unresponsive.

2. **Worn or Damaged Bushings**: Steering racks have bushings that allow smooth movement. Over time, these can wear out, causing excessive play in the steering and leading to an imprecise feel.

3. **Damaged or Worn Rack and Pinion Teeth**: If the teeth on the rack or pinion become worn or chipped, it can cause steering to feel rough, noisy, or cause the vehicle to drift unintentionally.

4. **Steering Play**: Excessive play or slack in the steering wheel can be caused by internal wear in the steering rack or tie rods. This can be dangerous as it can make the vehicle harder to control.

5. **Faulty Power Steering Pump**: While not strictly part of the steering rack, a malfunctioning power steering pump can affect the rack’s performance by failing to provide adequate hydraulic pressure, leading to difficulty in steering.

6. **Corrosion or Contamination**: Debris or rust inside the rack can cause stiffness or damage to internal components, often leading to steering binding, grinding noises, or complete failure.

7. **Electronic Steering Rack Issues** (on newer vehicles): In some vehicles, the steering rack is electrically assisted. A fault in the electronic control unit (ECU) or sensors can cause problems like inconsistent steering effort or failure of power steering assist altogether.

If you notice difficulty turning the wheel, unusual noises, or fluid leaks, it's essential to get the steering rack inspected and repaired promptly to avoid further damage or potential safety risks.