FIGURE 7

FIGURE 8

FIGURE 9

FIGURE 10

FIGURE 11

Typical Split System (1 1/2 x 1/2)

Two independent braking systems. One system leads to the front and the rear brakes and the other system leads only to the rear brakes.

Identifying Feature:

1.Two lines from master cylinder. 2.Single hose to each front wheel. 3.Two hoses to rear axle.

691 Actuator Position:

 

(1) Front axle

(2) Rear axle

(3) 4-wheel

CAUTION: Whether position 2 or 3 is used, both halves of system must be locked.

Typical Rear Wheel Anti-Lock System (Dual Vertical Split)

Two independent braking systems. One system leads to the front brakes and the other system to the rear brakes.

Identifying Feature:

1.Two lines from master cylinder.

2.Anti-lock control valve between master cylinder and rear wheels.

691 Actuator Position:

 

(1) Front axle

(2) Rear axle

(3) 4-wheel

Imported Truck 3-Channel All-Wheel Anti-Lock System

Provides braking control by way of independent anti-lock channels for each rear wheel and a third channel for the front wheels.

Identifying Feature:

1.Three separate air/hydraulic brake boosters. 2.One line to front brakes.

3.Separate lines to each rear wheel.

691 Actuator Position:

 

(1) Front axle

(2) Rear axle

(1 & 2) 4-wheel

NOTE: The anti-lock functions on air booster system, not the hydraulic side.

Typical 3-Channel All-Wheel Anti-Lock System

Provides braking control by way of independent anti-lock channels for each front wheel and a third channel for both rear wheels.

Identifying Feature:

1.Two lines from master cylinder to anti-lock valve(s). 2.One line from anti-lock valve to rear brakes. 3.Separate lines from anti-lock valve to each front wheel.

691 Actuator Position:

 

(1) Front axle

(2) Rear axle

(1 & 2) 4-wheel

NOTE: Some 3-channel anti-lock brake systems use two separate anti-lock valves.

Typical 4-Channel All-Wheel Anti-Lock System

Provides braking control by way of an independent channel for each front wheel and each rear wheel.

Identifying Feature:

1.Two lines from master cylinder to anti-lock valve.

2.Separate lines from anti-lock valve to each of the front and rear wheels.

691 Actuator Position:

 

(1) Front axle

(2) Rear axle

(1 & 2) 4-wheel

NOTE: Some 4-channel anti-lock brake systems use two separate anti-lock valves.

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