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AI Overview
Air dryer assemblies with integrated distributors/governors (such as Bendix AD-9 or Wabco System Saver) are critical for heavy-duty vehicle air brake systems, removing moisture and contaminants to prevent freeze-ups and corrosion. These units, often 12V or 24V, integrate a desiccant cartridge, heater, and purge valve, distributing dry air to primary/secondary tanks. 
Key Features and Components 
  • Integrated Design: Features a distributor or governor assembly attached to the dryer, including a feed line, heater connection, and outlet ports for air systems.
  • Function: Uses desiccant to absorb moisture from the air compressor before it enters the brake lines.
  • Components: Includes a desiccant cartridge, purge valve, 12V/24V heater, and governor/check valve (distributor).
  • Common Applications: Suitable for trucks, RVs, and buses, including Freightliner Cascadia, Kenworth, Peterbilt, and Volvo. 
Top Replacement Models & Cross-References 
  • Bendix AD-9 Type (170.800202): A common 12V 75W unit with a new style end cover and extra ports, replacing part numbers such as 5002063, 5002074, and 800202.
  • Meritor Wabco System Saver 1200 Plus: A popular assembly often used on heavy-duty trucks, with replacements available.
  • Paccar/Wabco Assemblies: Various units available, such as 4324752100 for 12V systems. 
Maintenance and Installation 
  • Installation: Involves mounting the dryer, connecting the input, purge, and delivery lines, and ensuring the heater is connected.
  • Serviceability: Regular maintenance includes replacing the desiccant cartridge, which can be found as part of complete assemblies or as separate kits.
  • Safety: Always depressurize air tanks entirely before servicing. 
Top Manufacturers 
  • Bendix: Known for the AD-IP, AD-IS, and AD-9 models.
  • Meritor/Wabco: Famous for the System Saver series.
  • TRP: Offers reliable aftermarket air dryer assemblies. 
Common brands available at wholesalers like Big Rig World include Bendix, Haldex, and Wabco, with new assemblies ranging from $300 to over $1,300 depending on the model. 
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  • TRP Today: Air Dryer Assembly You Tube
    Dec 17, 2018 — so Matt if a vehicle is purging air every 30 seconds or just having issues building up air in general what's the first thing you t...
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  • 170.800202 | Air Dryer Assembly | AD-9 - Michigan Truck Spring
    SKU 170.800202. Complete AD-9 type air dryer assembly. 12 volt, 75 watt. New style end cover with additional port for air governor...
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  • Haldex | DA35220
    Table_title: Technical specifications Table_content: header: | Heater Watt Specification | N/A | row: | Heater Watt Specification:
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  • Air Dryer Assembly for 955205 4324130010 System Saver 1200 ...
    Widely applications: Auto air dryer assembly is a brand new aftermarket replacement, fit for trucks,RV,bus and others. Fit for Mer...
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  • 5002074 Air Dryer Assembly Replacement (AD-9) | Fleetsworld
    Here are some specifications for the 5002074: * Voltage: 12 Volt * Control port diameter: .25 inch * Inlet port diameter: .5 NPT i...
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  • Air Dryer Assembly for Freightliner Cascadia 125 Kenworth ...
    Air Dryer Assembly for Freightliner Cascadia 125 Kenworth Meritor Peterbilt Volvot Volvo System Saver SS1200 Plus Type Replaces 43...
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  • BRAKE & WHEEL END - AIR DRYERS - Sadler Power Train Inc
    Sadler Power Train stocks complete air dryer assemblies, replacement cartridges, and rebuild kits for all major commercial truck b...
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  • TRP Today: Air Dryer Assembly You Tube
    Dec 17, 2018 — so Matt if a vehicle is purging air every 30 seconds or just having issues building up air in general what's the first thing you t...
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  • 170.800202 | Air Dryer Assembly | AD-9 - Michigan Truck Spring
    SKU 170.800202. Complete AD-9 type air dryer assembly. 12 volt, 75 watt. New style end cover with additional port for air governor...
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  • Haldex | DA35220
    Table_title: Technical specifications Table_content: header: | Heater Watt Specification | N/A | row: | Heater Watt Specification:
    Haldex
  • Air Dryer Assembly for 955205 4324130010 System Saver 1200 ...
    Widely applications: Auto air dryer assembly is a brand new aftermarket replacement, fit for trucks,RV,bus and others. Fit for Mer...
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  • AD 12v Air Dryer Assembly Replaces for 1200 Series R955205 ...
    Best Selling in Air Dryers * Volvo Desiccant and Oil Separator Cartfridge Filter OEM 21620181. * Meritor WABCO R950068A Air Dryer ...
    eBay
  • 5002074 Air Dryer Assembly Replacement (AD-9) | Fleetsworld
    Here are some specifications for the 5002074: * Voltage: 12 Volt * Control port diameter: .25 inch * Inlet port diameter: .5 NPT i...
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  • Air Dryer Assembly - New High-Quality Replacement Part
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  • Air Dryer Assemblies - Parts for trucks - Big Rig World
    Dryer Assy-Air Puraguard Rx 12V Hs 5010696PG. Bendix. Part# 5010696PG. Part# 5010696PG. Ships in 1-3 days. $752.67. Dryer-Ad Sp Ev...
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  • Air Dryer Explained With Animation | Pneumatic Brakes | Part 1
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Web results

20452152 Air dryer assy with distributor for truck volvo


deyuanparts.com
https://www.deyuanparts.com › For VOLVO
deyuanparts.com
https://www.deyuanparts.com › For VOLVO
The Air dryer assy(with distributor) serves as the core component of the braking system. Overview and Function: It is responsible for drying and ...Read more
Air dryer assy with distributor from www.deyuanparts.com
Videos
TRP Today: Air Dryer Assembly You Tube
YouTube · TRP Parts
Dec 17, 2018
YouTube · TRP Parts
1:22
The TRP AD20001 air dryer assembly removes moisture and contaminants from your air brake system, preventing freezing and decreasing maintenance costs.
How To Replace An Air Dryer On A Semi Truck
YouTube · DS Motorworks
Sep 14, 2025
YouTube · DS Motorworks
10:31
Replace an air dryer on a semi truck by unhooking lines, unbolting it, and swapping fittings. It's plug and play.
Freightliner Cascadia AIR DRYER problem | Won't build up ...
YouTube · Cheetah Repair Services
Nov 2, 2023
YouTube · Cheetah Repair Services
2:08
Bypass a Freightliner Cascadia air dryer not building pressure with just an adjustable wrench to get to the shop.

View all

Web results

Air Dryer Assemblies - Parts for trucks


Big Rig World
https://bigrigworld.com › ... › Air Dryers & Components
Big Rig World
https://bigrigworld.com › ... › Air Dryers & Components
Buy Air Dryer Assemblies from top brands at the bigrigworld.com store at attractive prices! We'll help you with choosing the right part ...
4.8 store rating (98) · 1–3 day delivery · 30-day returns
Missing: distributor ‎| Show results with: distributor

170.800202 | Air Dryer Assembly | AD-9


TruckSpring
https://www.truckspring.com › ... › Air Dryers
TruckSpring
https://www.truckspring.com › ... › Air Dryers
Complete AD-9 type air dryer assembly. 12 volt, 75 watt. New style end cover with additional port for air governor. Replaces Bendix numbers.Read more
Air dryer assy with distributor from www.truckspring.com
$205.36 · In stock · 3–5 day delivery · 90-day returns

Buy Truck Air Dryer & More - Moisture separator for air ...


Mytee Products
https://www.myteeproducts.com › Truck Parts
Mytee Products
https://www.myteeproducts.com › Truck Parts
Find Air dryers & components - Get Air Dryer Cartridge Replacements, Purge Valve Kits, Diesel exhaust fluid filters & more.
4.6 store rating (5.8K) · $6 to $217 · Free delivery · Free 30-day returns

1 pcs 12 Volt Air Dryer Assembly Replaces for 955205 fit ...


eBay
https://www.ebay.com › itm
eBay
https://www.ebay.com › itm
1 x Air Dryer Assembly. This 12V air dryer fits for system saver 1200 Series, is also more suitable for volvo, kenworth, peterbilt 379.Read more
Air dryer assy with distributor from www.ebay.com
$7.95 delivery

Drying and Distribution Unit - WABCO Catalog


WABCO Customer Centre
https://www.wabco-customercentre.com › catalog › en_US
WABCO Customer Centre
https://www.wabco-customercentre.com › catalog › en_US
Drying and Distribution Unit with a material number 100304116 is available. Interested in another Air Dryer with Purge Tank? See more on new Inform.

Air Dryer Assembly for Freightliner Cascadia 125 ...


colon and rectal clinic of scottsdale
https://www.colonandrectalclinic.com › products › air-dr...
colon and rectal clinic of scottsdale
https://www.colonandrectalclinic.com › products › air-dr...
Air Dryer Assembly for Freightliner Cascadia 125 Kenworth Meritor ... Manufacturers, suppliers and others provide what you see here. $359.99. Price ...Read more
Air dryer assy with distributor from www.colonandrectalclinic.com
$144.00 · In stock · 4.0(139)
Missing: distributor ‎| Show results with: distributor
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Web results

5002074 Air Dryer Assembly (AD-9) - Fleetsworld


Fleetsworld
https://www.fleetsworld.com › products
Fleetsworld
https://www.fleetsworld.com › products
The 5002074 air dryer assembly offers reliable performance and is a direct replacement for the Bendix AD-9™ 12 Volt air dryer. It includes essential components ...Read more
Air dryer assy with distributor from www.fleetsworld.com
$215.37 · Free delivery over $1,000 · 30-day returns

BRAKE & WHEEL END - AIR DRYERS


Sadler Power Train
https://sadlerpowertrain.com › categories › air-dryers
Sadler Power Train
https://sadlerpowertrain.com › categories › air-dryers
Sadler Power Train stocks complete air dryer assemblies, replacement cartridges, and rebuild kits for all major commercial truck brands.Read more
$28 to $208 · 1–3 day delivery
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