WIN! Brake Potentiometer Tester courtesy of Drakefield

WIN! Brake Potentiometer Tester courtesy of Drakefield

Drakefield is offering the chance to win a brand new Brake Potentiometer Tester. Here, the company goes into more detail about why and how to use the product.

Most truck EBS systems nowadays monitor the pad wear percentage, and when the pads get to a pre-set wear value, the warning light or the display on the vehicle’s dashboard will signal that the pads need changing.

This is great if everything is working as it should do, but what if there’s a fault in the pad wear system somewhere?

A few systems will actually show an EBS light when there’s a fault, if the pads get low, or if there is an imbalance in the pad wear across the axle. This is all well and good, but what if the caliper’s potentiometer is faulty?

In this case, it is common practice to change the complete caliper, because in the past, potentiometers were not available as a separate part. However, this has changed now, as they can be bought and self-installed. The problem with this is how to set the potentiometer to the correct starting place.

Without the correct tool, it’s almost impossible to set a two- or three-wire potentiometer, as it has a voltage value that is essentially in an endless loop, which is being monitored by the EBS system, which then equates the voltage to a wear percentage on the dashboard. A good example is a three-wire silver potentiometer:

■ 1.0V = 100% new pads

■ 2.75V = 75% worn pads

■ 3.5V = 0% or fully worn pads

When fitting a new potentiometer, set it to 0%. The Drakefield potentiometer, which requires no training to operate, is easy to use by simply following the onscreen display to find the percentage, voltage and a bar graph.

The tester is specially designed for this job; it’s quick, accurate and tests the three most common types of potentiometers. Simply select the type of potentiometer that is being set from the OLED display and turn the centre of the potentiometer until the bar graph is at 0% and the correct voltage is shown.

The tester comes with two connecting cables, the Scania clip type and the screw-on type, and built-in batteries, which are rechargeable via USB power.


To be in with a chance of winning this great prize answer the following question:

What is the voltage that is applicable to fully worn pads?


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Deadline for entries is 10/10/2019.

This competition is run in association with Drakefield and open to trade only. 
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