SZ135-19 Air Spring — Gliderite 4-Bag Front (ASL4008A / ASL4008N)

A sleeve type air spring for the front-of-rear position on Gliderite 4-bag rear air suspension systems. Commonly found on ambulances, emergency vehicles and wheelchair-accessible vehicle conversions on Fiat Ducato (X250/X290), Mercedes Sprinter and Peugeot Boxer chassis. Supplied as a complete assembly.
 
This variant does not contain an internal bump stop. It is designed for systems where the vehicle's original chassis bump stops remain active. If your vehicle has an AL-KO full air system with a 4mm air line, you likely require the [SZ135-19P02 instead].
 
How to confirm your variant: This assembly weighs approximately 1.0kg and uses a 6mm push-fit air connector. If your air line is 4mm, this is not the correct replacement.
 
Available in two variants:
ASL4008A — SABO equivalent. A direct OE replacement for the Contitech original. UK stock held. ASL4008N — Contitech OE original. For those requiring a genuine branded replacement.
 
Both variants are direct replacements for the Contitech SZ135-19 / 60011 reference. If your existing spring is marked SZ135-19 this is the correct replacement, provided your system uses a 6mm air line.
 
Pairing note: In a Gliderite 4-bag system this spring sits in the front-of-rear position. For the rear-of-rear position on the same system, see [ASL4009A / ASL4009N — SZ135-23]. Replacing in pairs across the axle is recommended for balanced suspension performance.
 
Key cross-references: Contitech SZ135-19 / 60011 | OnAir ASL4008A / ASL4008N
Air connector: 6mm push-fit
Weight: approx. 1.0kg
Construction: Sleeve type — complete assembly, no internal bump stop
Application: Front-of-rear on Gliderite 4-bag rear air suspension systems Available as: SABO equivalent (ASL4008A) or Contitech OEM (ASL4008N)
 
Always verify your existing part number before ordering. Contact our team if you are unsure whether this is the correct replacement for your application.