BENDIX TCH-002-010 Leaflet

This Bulletin addresses vehicles originally 
equipped with dual tires on the drive axles which 
are retrofitted with “wide-based” tires (also 
referred to as “Super Singles”).  

Test data has shown that retrofi tting “wide-based” 
tires can result in higher vibrational loading of 
vehicle drive axles and wheel ends.  As a result, 
the air chamber bracket supports are potentially 
exposed to vibrations and stresses beyond their 
original design capabilities.  

As with all retrofi ts, Bendix recommends that 
the installer confi rm with the vehicle Original 
Equipment Manufacturer (OEM) that the changes 
to be made to the vehicle are approved and obtain 
from the OEM any vehicle modifi cations that are 
required (e.g. suspension clearances, etc.) before 
proceeding.

When vehicles equipped with Bendix foundation 
brake components are retrofi tted with wide-based 
tires, Bendix requires the vehicles to be further 
equipped with:

•  Air chamber brackets with gussets (see 

Figure 1).  If the air chamber brackets do not 
have gussets, they must be replaced with 
Bendix approved air chamber brackets with 
gussets.  Identify the part number stamped 
into the support arm (see Figure 2 for location) 
and refer to BW7253 for the proper gusseted 
replacement.

• 

Bendix “Marion” air chamber bracket supports 
or other Bendix approved air chamber bracket 
supports, welded to the axle, are required (see 
Figure 2).

“MARION”

AIR CHAMBER 

BRACKET 

SUPPORT 

(TYPICALLY 

820188)

AIR CHAMBER BRACKET 

PART NUMBER STAMPED HERE

Example of 

Air Chamber 

Bracket with 

Gusset

GUSSET

Example of 

Air Chamber 

Bracket without 

Gusset