PDF User Manual

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TRAILPARTS PRODUCT 

HOW-TO GUIDE

4500KG 

GVM

WIRING INSTRUCTIONS FOR 

Trailparts

 Credo  Brake Control

to suit electric drum brakes

TM

TM

CREDO CAB CONTROLS

The  Trailparts™  Credo™  Braking  system  meets  Australian  Design  Rules  38                                         

braking regula� ons and is legal for trailers up to 4500kg GVM when used according to 

these instruc� ons.

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TO OPERATE:

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The in-cab controller must be connected at all � mes and located within easy 

reach of the driver. 

The vehicle park or head-lights must be switched on when towing the trailer. This 

energizes the trailer side of the system and also will allow the trailer ba� eries to 

charge.

Check the plug and socket of the trailer and tow vehicle are securely connected 

and that the trailer ligh� ng func� ons all work correctly. A faulty or intermi� ent 

ligh� ng connec� on could mean the brakes do not operate correctly.

Ensure the break away cable is securely fastened to the vehicle.

Test the emergency brake is working. First adjust the gain control se�  ng to read 

75%. Depress emergency stop bu� on fully, and begin to pull forwards while s� ll 

holding the bu� on down. The trailer brakes should lock the wheels.

Do not use the emergency stop feature or breakaway func� on as a parking brake.

Test the emergency brake is working. First adjust the gain control se�  ng to read 

75%. Depress emergency stop bu� on fully, and begin to pull forwards while s� ll 

holding the bu� on down. The trailer brakes should lock the wheels.

The in-cab controller must be connected at all � mes and located within easy 

The vehicle park or head-lights must be switched on when towing the trailer. This 

energizes the trailer side of the system and also will allow the trailer ba� eries to 

Check the plug and socket of the trailer and tow vehicle are securely connected 

and that the trailer ligh� ng func� ons all work correctly. A faulty or intermi� ent 

ligh� ng connec� on could mean the brakes do not operate correctly.

Test the emergency brake is working. First adjust the gain control se�  ng to read 

75%. Depress emergency stop bu� on fully, and begin to pull forwards while s� ll 

Do not use the emergency stop feature or breakaway func� on as a parking brake.

-

0

EMERGENCY 

STOP

LESS

MORE

ADJ.

+

GAIN

SENS.

Z

z

P

Screen sleep

Gain control

Braking level

Emergency brake

Tail-light indicator

Hand-piece ba� ery

Sensi� vity control

1
2

3

4

5

6
7

CREDO CAB CONTROLS

1

Screen Sleep Button 

Press and hold for 5 seconds. Unit will beep 6 � mes and display sleep menu. When put to sleep while plugged into power, 

tap screen to wake. If put to sleep while unplugged, unit will need to be plugged into power again to wake up.

2

Gain Control  - Adjusting Gain Control: 

Press either bu� on once to show current gain se�  ng. 

The plus bu� on will increase the maximum brake percentage, and the minus bu� on will decrease it. This should be set so 

the vehicle will brake to a halt without the trailer wheels locking up. An eff ec� ve benchmark is to perform a brisk stop on 

a straight fl at stretch of road from 30 kph. The vehicle trailer combina� on should halt without the trailer wheels locking. 

Increase or decrease the gain se�  ng un� l the trailer is braking at just under the lock up level. Ensure condi� ons are safe 

around you before carrying out this procedure. 

3

Braking Level

This number displays braking level during braking and gain and sensi� vity se�  ngs.

4

Emergency Brake

When ac� vated, this will apply the trailer brakes at 75% of the current gain se�  ng. This can be used to control trailer sway 

situa� ons and stop the vehicle combina� on in an emergency. 

5

Tail-light Indicator

Confi rms tail-lights are on. Shows red X if tail-lights not detected

6

Hand-piece Battery

Status of hand-piece ba� eries

7

Sensitivity Control

Press once to show current se�  ng.

Controls determine how quickly and aggressively the brakes will ac� vate, with 1 being least and 5 the most aggressive. 

Pressing this advances the se�  ng from 1 up to 5 and then back to 1. Se�  ng this to 3 provides mid-range braking. Decrease 

se�  ng to 2 or 1 if brakes come on too suddenly. Increase se�  ng if braking ac� on seems too slow. 

Credo Cab Controls

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CREDO SCREEN CONTROLS AND WARNINGS

Headlights Warning

Will fl ash on screen with 4 beeps if headlights are not 

on on the trailer or  there is a loss of communica� on 

between the trailer and cab modules. In the event of 

communica� on loss, providing the headlamps are on 

and the ligh� ng connec� on between the tow vehicle 

and the trailer is not faulty the brakes will con� nue 

to operate at the last se�  ng. This should however be 

inves� gated as soon as it is safe to stop. 

Low Trailer Battery Warning

Will fl ash and beep 4 � mes each � me the brakes or 

emergency brake are applied if the trailer ba� ery 

voltage has dropped to an unsafe level, which would 

result in the brakes not opera� ng correctly. This screen 

will also display if the trailer ba� ery is disconnected.

Sleep Menu

Press and hold ‘Zz’ in the top le�  corner of the screen 

for 5 seconds. Credo unit will beep 6 � mes and display 

sleep menu shown to the le� . Press the indicated area 

of the screen to put the unit into sleep mode or press 

cancel to return to the home screen.

When put to sleep while plugged into power, tap screen 

to wake. If put to sleep while unplugged, unit will need 

to be plugged into power again to wake up.

Note: Trailer module is compa� ble with 12 or 24 volt. Cab unit 

is compa� ble with standard vehicle USB ports or 12 or 24 power 

sockets providing a 12-24 volt USB adapter is used.

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Press and hold ‘Zz’ in the top le�  corner of the screen 

for 5 seconds. Credo unit will beep 6 � mes and display 

sleep menu shown to the le� . Press the indicated area 

of the screen to put the unit into sleep mode or press 

When put to sleep while plugged into power, tap screen 

to wake. If put to sleep while unplugged, unit will need 

CREDO INSTALLATION INSTRUCTIONS

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>

Mount the Brake controller according to the moun� ng orienta� on instruc� ons 

on page 7.

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Wire the brake controller according to the instruc� ons on page 6.

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It is important that trailers fi � ed with the Credo

TM

 braking system are also fi � ed 

with 12/24 volt LED lights, not LED or incandescent lights that are voltage specifi c

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The controller is capable of running trailers with up to 6 wheels braked with

electric drum brakes.

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The earth from the trailer brakes and the trailer ba� ery must only connect to

the brake controller output earths as shown in the diagram. They cannot be

connected to a common chassis earth.

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Cable gauge should be of suffi  cient size to avoid voltage drop. For electric

drum brakes a minimum of 15 amp cable should be used and a separate feed

should be run per two wheels that are fi � ed with brakes.

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The trailer lights must only be connected to the 5 core ligh� ng output from the 

controller and cannot bypass this directly to the trailer plug.

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There is a spare orange wire and pink wire that are not used when installing on 

a trailer fi � ed with electric drum brakes. These can be cut short and taped off .

ELECTRIC DRUM WIRING DIAGRAM

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Connect one grey to each side

of the breakaway switch

White

to Electric Drum Earth

Blue

to Electric Drum Positve

Orange

 is not used

Green - Right Indicator

Brown - Tail light

White - Earth

Red - Stop light

Yellow - Left Indicator

Connect trailer lights to

5 core output

Batt

er

y C

onnections

Whit

e Negativ

e

Or

ang

e P

ositiv

e

One 5 Amp/hr 

battery

Must be fitted 

with battery 

supplied.

Do not use 

brake system 

battery to 

power any 

other systems

There  should  be  no  more 

than  2.5  metres  of  cable 

between the controller and 

the  trailer  plug  to  avoid 

voltage drop. 

30amp Fuse

Pink

not used

Wiring diagram above applies to SE Brake Controller with electric drums only

Direction of Travel

Must be mounted straight longitudinally, i.e. parallel to direction of travel

INCORRECT

CORRECT

90

o

FRONT

FRONT

Unit Must Be Level

Laterally

INCORRECT

CORRECT

90

o

SIDE

Direction of Travel

SIDE

Back can be up to

70 Degrees Up

Back can be up to 

20 Degrees Down

20

o

70

o

OR

DIRECTION OF TRAVEL

Must be mounted straight longitudinally, i.e. parallel to the direc� on of travel

FRONT

FRONT

Unit Must Be Level

Laterally

INCORRECT

CORRECT

90

o

Unit must be level laterally

Direction of travel 

Back can be up to 70 degrees up

Back can be up to 20 degrees down

OR

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ON-TRAILER MODULE MOUNTING ORIENTATION

MAINTENANCE AND CHECKS

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Check ba� ery is keeping well charged. A well charged ba� ery should be at

or above 13 volts. This is par� cularly important if the trailer is le�  parked for

extended periods of � me. If the trailer is not used for extended periods the

ba� ery should be removed every 2 months and charged to ensure it does

not become damaged. This can happen if the ba� ery charge drops below

10.5 volts.

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Check the trailer plug and vehicle socket to ensure they are not damaged and

they give a sound electrical connec� on. An intermi� ent or faulty connec� on

could mean the brakes do not func� on correctly.

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If fi � ed with a hydraulic actuator make sure the fl uid level remains suffi  cient.

The fl uid should be changed in line with general trailer service intervals.

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If fi � ed with electric drums make sure they are kept properly adjusted and

that the magnets and linings are not excessively worn and are replaced in

line with general trailer service intervals.

OTHER INFORMATION

The trailer and cab parts of the controller are uniquely paired together by their serial 

numbers.

The serial number is a 3 or 4 digit number and is located on the bo� om of the cab unit 

and is stamped on the front of the trailer unit.

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FOR MORE INFORMATION