Brake Roller Testing

Brake Roller Testing

Brake roller testing is not only to test how well the vehicle brakes work or if they work at all, But to check the vehicles shocks & suspension.

The video on the left is demonstrating how the shock test is done.

The vehicle is driven on to the red device which is able send small & large amounts of vibrations up through to the shocks.

This information is then sent to a computer running the right system, to tell us how well the vehicle shocks are working.

To the right is the results of the shock test above,
Over all results of the test for the front axle was:
Left - 60% at 24mm, Right - 58% at 25mm with an imbalance of 2% 
> 40% Normal
< 40% Effect weak
< 20% defect

Next was the front braking test on the brake rollers.
Once front wheels are on the rollers, The vehicle is then put in neutral & the rollers move the front wheels.

Front Left - 4.44kN

Front Right - 4.62kN

Imbalance - 4%

The video on the right is of the front brake roller testing. The front brakes are then slowly applied as the rollers are moving. Eventually fully applying them.

The video on the right is of the above brake roller tester.It will show when the brakes are applied & when the brakes are held & then fully applied.

Brakes applied - the blue level rises

Brakes held - the blue level sits within the yellow zone.

Brakes Fully Applied - the yellow level to the right counts down to the left, Once it has completely counted down then the brakes are full applied.

Next is the back shock absorbers to be tested.
The same process is applied to the back as it was to the front.

The over all result of the Rear Shocks:

Left - 58% at 36mm, Right - 54% at 39mm with an imbalance of 4%


> 40% Normal
< 40% Effect weak
< 20% defect

Video on the right is of the bake shock absorbers.At the bottom of the screen you will see a wave start to form this is from the first shock, The second wave that will appear will be reading of the second shock.

Next we test the Rear Brakes & the Parking Brake/ Hand Brake.
Them same as the Front Brake test is applied with the Rear Brakes.
But with the Rear Brakes we found that when fully applied they didn't completely stop the back wheels from spinning.

To the right is another video showing you the results & how the test is done.

Rear Left - 2.15kN

Rear Right - 2.40kN

Imbalance - 10%

Testing the Parking Brake has the same process as testing the Front & Back Brakes

The video on the right is showing you the test results as the test is being done.

Parking Brake:

Left - 1.23kN

Right - 2.13kN

With an Imbalance of 42%

Once all these test have been done, we then had to take the vehicle out & jack it up on axle stands. Removing all tyres & fix any problems that needed attending to. The following pics below show us working on the Rear Brakes.

Unfortunately even after we thought we had fixed the problems, we still ended up failing the roller test. Due to the hand brake not being tight enough.
This would be an easy problem to fix but unfortunately we had run out of time.