745-K042436 | Genuine Bendix AD-IS Air Dryer PuraGuard 12V

When an air compressor runs, it creates hot, moisture-filled air.
Moisture can cause:

• Brake line freezing

• Rust and corrosion

• Valve damage

The air dryer pulls this moisture out before it reaches the air tanks.

2. Filters Out Oil and Contaminants

An air dryer contains:

• A desiccant cartridge to absorb moisture

• A filter to remove dirt, oil vapor, and debris

This keeps the air system clean and reliable.

3. Protects the Air Brake System

Clean, dry air prevents:

• Frozen brake valves in winter

• Premature wear of brake components

• Air leaks and sticking valves

4. Purges Moisture Automatically

Most air dryers have a purge valve that:

• Releases accumulated moisture

• Self-cleans the desiccant

• Maintains system health with minimal maintenance

• Water drains out when you pull the tank drain

• Air lines feel wet inside
  This is the biggest indicator the dryer is not removing moisture.

2. Frozen Brake Lines in Cold Weather

• Brakes won’t release

• Valves stick in freezing temperatures
  If the dryer doesn’t remove moisture, it freezes in the system.

3. Excessive Oil in the Air System

• Oil film in air lines

• Oily discharge from the purge valve
  This can damage valves, seals, and brake chambers.

4. Frequent or Constant Purging

• Dryer purges way too often

• Or doesn’t purge at all
  Both indicate a purge valve or internal failure.

5. Slow Air Build-Up

• Takes too long to reach operating air pressure

• Compressor runs longer than normal
  Moisture-saturated desiccant or internal blockage is common.

6. Air Leaks From the Dryer

• Hissing at the purge valve

• Leaking fittings or cracked housing
  Leaking air prevents proper system pressure.

7. Brake Warning Light or Low Air Pressure Alarms

Caused by:

• Air not drying properly

• System pressure not staying stable

• Leaks or poor air regulation

8. Contaminated or Degraded Desiccant

• White dust in the air system

• Desiccant breaking apart
  This debris can damage valves throughout the system.

9. Corrosion in Tanks or Valves

If the dryer fails, moisture promotes rust inside:

• Air tanks

• Brake valves

• Governors

• Control modules

10. Overheating Air Compressor

If the dryer is plugged:

• The compressor must work harder

• Can overheat or fail early