The Automotive Blog

BrakeCheck GEO Quick Reference Guide

Commercial Vehicle Brake Testing

The following criteria are required for all HGV brake testing.

All brake testing should be carried out away from the sites working area; this should be done in an area that has roughly level ground.

The MOT performance figures are for the Peak Reading:

Service Brake Bare Minimum                         50 %

Secondary Brake Bare Minimum                    25 %

Parking Brake Bare Minimum                         16 %

Although the test requirement looks for a peak reading, you could use the relationship between the peak and average to determine brake performance, if you achieved a peak reading of say 51  – 58 this is not indicating good brakes, peak figures of 70 + can be achieved to indicate good brakes, even though high peaks are recorded if a low average is recorded (20 – 30 example only) this would indicate bad brakes or you will more than likely fail a roller brake test!

Brake Tester Position

The brake tester should be positioned in the foot well of the vehicle, preferably up against a bulkhead with the direction of travel arrow pointing in the intended direction and with the tester straight.

Vehicle Test Procedure

With the vehicle stationary, position and arm the brake tester, accelerate the vehicle at a constant rate in a straight line up to a safe site speed then apply the brakes in an emergency stop manner, hold the vehicle on the brake until the vehicle has come to a complete rest.

Arming The Brake Tester

Turn the BrakeCheck on by pressing and holding MENU until Sbr is displayed on the screen.

Press ENTER, the display may well show GPS flashing (Setup Mode also flashes), if so the BrakeCheck is now in GPS location mode, once the BrakeCheck has found the satellites then the test will move onto the level indicator.

The display will now show the level indicator L-| |-, if this is not the case re-position the BrakeCheck until achieved.

Press ENTER the display should now read 0.00 ± 5. As described above accelerate and brake.

The peak reading will report at the end of the test, if the display still shows L-| |- you did not press ENTER!!

With the Peak reading displayed press ENTER, this will show the average reading. Pressing ENTER again shows further information.

For a Hand Brake Test press MENU twice, this is while the service brake results are displayed, the display should now show Hbr. Now go to the second paragraph under Arming The Brake Tester to carry out a test.

Printing Stored Tests

BrakeCheck GEO has a 99-test memory on the service and hand brake tests; the tests are stored in the memory by the latest test completed being test number 1.

Printing is via Infra-red! No cable required.

Point the front of the BrakeCheck at the front of the printer.

To Print the Service Brake:

If the BrakeCheck has powered-down due to inactivity:

Press MENU until the display shows Sbr.

Press MENU twice until the BrakeCheck display shows Sbr and the bottom half of the shows to lights, one on Service Brake Test and the other on Last Test Result

Press ENTER once, the display will show L n, press MENU the display will show L A (pressing ENTER now will print off all tests in the memory), Press MENU and the display will show L 1, pressing MENU will increase the test number by ONE, holding down MENU will increase the test number at a rapid rate:

With the desired test number on the display press ENTER, the Peak Reading will be displayed, with the printer switched on and the BrakeCheck pointed at the printer press PRINT. Each print out will take roughly 10 seconds to print. This is not necessary if the unit has not powered-down, the Peak Deceleration (Front/Rear) LED will be lit and the display will show a value, eg: 0.86

Turn the printer on by pressing the grey M button on the front of the printer, a green light should now be on! If a green light is flashing the printer needs recharging or paper is low!!

Press PRINT once, the display will show: Prt

and the printer will print the results for the last test performed. Now do the same for the Hand Brake but have the Hand brake test light and Last Test Result illuminated on the BrakeCheck.

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Quick Reference User Guide

Commercial Vehicle Brake Testing

The following criteria are required for all HGV brake testing.
All brake testing should be carried out away from the sites working area; this should
be done in an area that has roughly level ground.

The MOT performance figures are for the Peak Reading:
Service Brake Bare Minimum 50 %
Secondary Brake Bare Minimum 25 %
Parking Brake Bare Minimum 16 %

Although the test requirement looks for a peak reading, you could use the
relationship between the peak and average to determine brake performance, if you
achieved a peak reading of say 51 – 58 this is not indicating good brakes, peak
figures of 70 + can be achieved to indicate good brakes, even though high peaks are
recorded if a low average is recorded (20 – 30 example only) this would indicate bad
brakes or you will more than likely fail a roller brake test!

Brake Tester Position
The brake tester should be positioned in the foot well of the vehicle, preferably up
against a bulkhead with the direction of travel arrow pointing in the intended direction
and with the tester straight.

Vehicle Test Procedure
With the vehicle stationary, position and arm the brake tester, accelerate the vehicle
at a constant rate in a straight line up to a safe site speed then apply the brakes in an
emergency stop manner, hold the vehicle on the brake until the vehicle has come to
a complete rest.

Arming The Brake Tester
Turn the BrakeCheck on by pressing and holding MENU until Sbr is displayed on the
screen.
Press ENTER, the display will now show the level indicator L-| |-, if this is not the
case, re-position the BrakeCheck until achieved.
Press ENTER the display should now read 0.00 ± 5.

As described above accelerate and brake.
The peak reading will report at the end of the test, if the display still shows L-| |- you
did not press ENTER!!
With the Peak reading displayed press ENTER, this will show the average reading.
Pressing ENTER again shows further information.
For a Hand Brake Test press MENU twice, this is while the service brake results are
displayed; the display should now show Hbr. Now go to the second paragraph under
“Arming The Brake Tester” to carry out a test.

For a Secondary Brake Test press MENU three times, this is while the hand brake
results are displayed, and the display should now show SEc. Now go to the second
paragraph under “Arming The Brake Tester” to carry out a test.

Printing Stored Tests
BrakeCheck has a 1 – TEST MEMORY on the Service Brake, Secondary Brake
and Hand Brake Test
The BrakeCheck can output test results to a printer if required. Printing is via Infra
red.

To Print:
Printing the Service Brake:
If the BrakeCheck has powered-down due to inactivity:
Press – Menu until the display shows Sbr.

Press Menu twice until the BrakeCheck display shows Sbr and the bottom half of
the BrakeCheck Decal menu shows two lights, one on Service Brake Test and the other on Last Test Result
Press “Enter” once, (this is not necessary if the unit has not powered-down) the
Peak Deceleration (Front/Rear) LED will be lit and the display will show a value, eg: 00.71

Make sure the printer is turned on, turn the printer on by pressing the GREY M
button on the front of the printer, a green light should now be consistent on.

If the green light is flashing the printer needs recharging!!
Point the front of the brake tester at the front of the printer.
Press “Print” once, the display will show: Prt
and the printer will print the results for the last test performed.
Now do the same for the Hand Brake or the Secondary Brake, but have the Hand
brake test light and Last Test Result illuminated on the BrakeCheck or the Service,
Hand Brake & Last Test Result illuminated for the Secondary Brake

It is acceptable to use an approved and calibrated decelerometer to measure overall brake efficiency values for rigid vehicles without trailers or for vehicles that cannot be tested on an RBT. A decelerometer will measure the overall brake efficiency but it may not identify individual braking issues. A temperature check needs to be carried out at the same time as a decelerometer test to help identify if individual brakes are operational. Brake temperature readings would need to be well above ambient temperature with relatively consistent readings taken for each brake across an axle. Brakes which are cold (ambient temperature) or showing an inconsistent reading from the brake on the opposite side on the same axle, need to be investigated further. Where possible brake testing should be undertaken with the vehicle or trailer in a laden condition to achieve the most meaningful results. A competent person may carry out a risk assessment based on use, working conditions, mileage and the age of vehicle to determine if some of the brake tests carried out in the year can be unladen; however, it is strongly recommended that at least 4 of the brake tests carried out are laden1 .

Risk assessments need to be retained on file and made available for inspection. From 1st January 2023 vehicles and trailers must be appropriately laden when presented for annual test2 . From April 2025 there will be an expectation that a laden roller brake test or EBPMS will be the only accepted methods to assess brake performance.

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Here are the user guides for your BrakeCheck, please note the version of your BrakeCheck, i.e. Standard MOT, Secondary, GEO, Truck & Trailer Or BCheck Plus

BrakeCheck Secondary With Printer CLICK HERE

BrakeCheck MOT Click Here

BrakeCheck Truck & Trailer Click Here

BrakeCheck GEO Click HERE

BrakeCheck Download to PC

Here are using guides for the TrailerCheck product range

TrailerCheck Portable CLICK HERE

NoxBox User Guide CLICK HERE

EBS / ABS Sensor Master User Guide CLICK HERE

TestaTow User Guide CLICK HERE

ISOCheck User Guide Click Here

We can also email user guides in PDF – send a request to matt@aideautomotive.com

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BrakeCheck is a decelerometer but what is a decelerometer ?

Decelerometers, also known as deceleration sensors or deceleration meters, are devices used to measure and quantify deceleration or negative acceleration. Deceleration refers to a decrease in velocity over time, and it is commonly associated with the braking or slowing down of an object or vehicle. Decelerometers are widely used in various applications, particularly in the automotive industry for safety and performance monitoring. They are often integrated into vehicles, specifically in systems such as airbags and electronic stability control (ESC) systems. These sensors play a crucial role in detecting sudden deceleration events, such as collisions or rapid braking, and triggering appropriate safety measures. The working principle of decelerometers typically involves the use of microelectromechanical systems (MEMS) technology. MEMS decelerometers consist of a tiny mass suspended on a spring-like structure. When subjected to deceleration forces, the mass moves relative to the sensor housing, causing a change in electrical output. This change is then measured and converted into acceleration or deceleration values. The output of a decelerometer is usually expressed in units of acceleration, such as meters per second squared (m/s²) or gravitational force (g). Some advanced decelerometers may also provide additional information, such as the direction of deceleration or rotational acceleration. Besides automotive applications, decelerometers can be found in other fields where the measurement of deceleration is important. For example, they are used in aerospace engineering to monitor the deceleration forces experienced during spacecraft re-entry or landing. They are also utilized in sports science to assess the impact forces on athletes during various activities, such as running or jumping. Overall, decelerometers are valuable tools for measuring and analysing deceleration forces in different contexts, contributing to safety, performance evaluation, and research in various industries. aide automotive market the BrakeCheck Decelerometer for automotive use in the UK MOT garages and HGV Brake testing.

Learn more – Brake Tester Decelerometers for MOT / HGV

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Contact aide automotive on 0115 8456471 or info@aideautomotive.com Our product range – Trailer / Caravan Light / Brake Tester – HGV Brake Testers – Trailer EBS Testers – HGV Truck Trailer EBS / ABS Sensor Tester – Truck /Trailer Diagnostic Tools – Midtronics Battery Testers – Anti Siphon Devices – ISOCheck – Trailer Locks – Auto Braking Reversing System – HGV Diesel Tank Alarms – HGV Siphon  – Misfuelling Diesel Head – Truck Susie Coil Covers – #MOT #Calibration – 12 Volt Trailer / Caravan Light / Brake Tester– Plus More