Heavy haul – Bendix Commercial Vehicle Systems BRAKE APPLICATION GUIDELINES User Manual
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Defi nitions
Movement of heavy equipment or materials at legal maximums or special permit loadings
Operation on road surfaces of concrete, asphalt and maintained gravel
High horsepower engines and auxiliary gear boxes are typically used
Vehicles may be equipped with two retarders
100% load going and empty return
Typical Vehicle Types
Tractor/Trailer Combination:
Equipment Hauling
Flatbed
Lowboy
Steel Hauling
General Requirements
• Anti-compounding air system
• Cam same operation for all steerable axle brakes and EB1807R brakes
• Air chamber bracket with gusset for all Heavy Haul applications, see page 45
• Air chamber bracket assembly gusset and additional camshaft bracket support see page 45, attached to the axle housing
when the:
a. Brake centerline to air chamber centerline distance (BCCC dimension) is greater than 343 mm [13.5"]
b. Application use a type 30/36 or 36/36 Spring brakes chambers.
c. Camshaft brackets with BCCC dimension of less than 8.12" does not require a gusset or additional support.
d. Super Single Tire (Wide Base)
Note: The above support can be supplied by BSFB or the vehicle manufacturer but
must be approved by BSFB Application Engineering Department.
• Applications for use in countries other than the USA and Canada must be reviewed by BSFB Application Engineering.
• Vehicle manufacturer is responsible for air system design, parking and stopping distance performance.
• For all S-cam brake models the camshaft input torque is limited to 2545 N•m [22,500 in-lbs].
• Applications on vehicles with fi xed or liftable auxiliary axles (tag or pusher) must be approved on an individual basis by the
BSFB Application Engineering Department, as auxiliary axles may impact the braking performance of the vehicle.
General Recommendations
• Cam same for all brake assemblies
• Dust shields for all applications
• Use Auxiliary retarders per TMC RP636
• Drum brake / Rotor material specifi cation per SAE J431. Drum / rotor surface fi nish 4.57 micrometer [180 max microinch]
and .38 mm [.015”] runout, when mounted on a hub rotated on bearings. See notes section for Minimum Drum Weight
requirements
• Brake air system balance per TMC RP632
Heavy Haul