Instruction Manual

Deﬁ nitions

 Vehicles used to transport people and equipment for the purpose of extinguishing ﬁ res or ambulance service

 Mileage is typically under 20,000 miles per year

 Typical vehicle routes are three (3) miles between start and stop

 Multiple high deceleration stops are common

 Auxiliary retarders are common

 Higher parking performance required

Typical Vehicle Types

Aerial Ladders Pumpers

Aerial Platforms Ambulance

Tankers

Vehicle Conﬁ guration

4 x 2, 4 x 4, or 6 x 4 straight trucks

General Requirements

• Anti-compounding air system

• Cam same operation for all steerable axle brakes and EB1807R brakes

• Air chamber bracket with gusset for all Fire Service 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 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 Tires)

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

• Brake drum / 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

Fire Service