Instruction Manual

Deﬁ nitions

 Line Haul is moving different types of freight in high mileage operation (over 60,000 miles/year)

 Operation on road surfaces of good to excellent concrete or asphalt

 Typical vehicle routes exceed 30 miles between start and stop

 Typical vehicle conﬁ gurations are 4 x 2, 6 x 2 and 6 x 4 tractor/trailer combinations and straight trucks

Typical Vehicle Types

Auto Hauler Flatbed Trailer Refrigerated Freight Pipe Hauler

Bulk Hauler General Freight Livestock Hauler Tanker

Doubles Grain Hauler Moving Van Triples

General Requirements

• Anti-compounding air system

• Cam same operation for all steerable axle brakes

• 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 brake 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.

• Use air chamber bracket with gusset for applications, see page 45, when the application includes any of the

following components:

a. Super single tire

b. Type 30/36 or 36/36 Spring brake chambers

c. High articulation suspensions

d. Two-speed axle or Planetary double reduction axles

• 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, with the exception of the ES1504L, the camshaft input torque is limited to 2545 N•m [22,500 in-lb].

• Brake model ES1504L camshaft input torque is limited to 1490 N•m [13,200 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

• Brake drum / Rotor material speciﬁ cation per SAE J431. Drum / rotor surface ﬁ nish 4.57 micrometers [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

• Due to legal maximum highway GAWR (17,000-20,000 lb) per code of federal regulations, 23 CFR - chapter 1, part 658

and brake balance to trailers, brakes should be rated to 20,000 lb when used on structurally rated 23,000 lb GAWR drive

axles.

Line Haul