Hunter Engineering B400T Brochure

B400T Heavy-Duty Brake Tester

Measure brake balance on multi-axle vehicles

Measure brake balance on a wide range
of vehicles in 60 seconds or less!

The Hunter B400T accurately measures all braking forces on multi-axle vehicles such as tandem-axle tractors,
tractors and semi-trailers, and two-axle vehicles, including passenger cars, buses and light trucks.

10

Drive on and stop

0:59

Drive the vehicle onto plates and apply the
brakes. Precision load cells automatically
measure braking forces and dynamic weight.

Detailed, easy-to-read brake analysis

Steer axle

Drive axle

Measures weight shift
during braking

The B400T takes into account the
rear-to-front weight shift that occurs during
braking, resulting in a more accurate
evaluation than roller-type testers.

Results available
immediately

Printouts serve as a guide for
the technicians performing service
and provide a permanent record
of vehicle status.

Identify Conditions Affecting Brake System Performance

Optional Signal Light indicates when

the tester is ready and helps the

operator stop correctly every time.

Part #20-967-1

Brake Balance Results

4 Segments within each wheel indicate

braking force as a percent of weight—more
segments indicate higher brake strength

4 Arrows on each axle indicate side-to-side

balance, with the green area indicating pull

4 Arrows below the wheels show adhesion

utilization (measure of braking effectiveness)

Service Brake Results

4 Provides raw brake force data

4 Linear graphs plot braking force and

dynamic weight separated between
steer axle (top) and drive axle (bottom)

4 Deceleration and/or braking distance

can also be displayed, useful for
transit applications.

4 Axle-to-axle imbalance

During braking, the stronger axle will lock up first,

resulting in loss of steering control or jack-knifing.

4 Left-to-right imbalance

Can cause “pulling” to the stronger side during braking,

resulting in a skid. Also detects single weak brakes.

4 Test parking or emergency brakes

The B400T can test mechanical brakes on a straight

truck and spring brakes on an air brake system.

4 Static weight

Works as a scale, with accuracy of +/- 2 percent.

4 Dynamic weight and deceleration

Load cells measure dynamic weight of the axles during

braking, and the system calculates vehicle deceleration.

4 Adhesion utilization

Tells the technician if each brake is doing its

fair share of the braking.

4 Test fully-loaded vehicles

Single-, tandem- or triple-axle weight can be

tested with a full load.

Static Weight Results

4 Shows static weight for each wheel,

total for each axle and total for vehicle,
along with GAWR and GVWR

4 Performed automatically as soon as

the vehicle comes to rest

4 All axle weight limits are user-programmable

to accommodate different vehicle platforms

Conclusions

4 Easy-to-understand description of vehicle

results are color-coded and may be printed

4 Green “Passed” message is used for test

results that are OK. Red or yellow coded
messages are more detailed and indicate a
potential problem or trouble spot.