Jaltest (50004011) | Wear Sensor Tester (WST)
Warranty directly via AsTools
Warranty directly via AsTools
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2 years warranty on all products
2 years warranty on all products
All our products come with a 2-year factory warranty. This ensures you long-lasting quality and service.
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Easy returns
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Professional customer service
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The Jaltest WST (50004011) is a independent wear sensor tester for brake pad wear sensors. It carries the OE reference K154433N50 from Knorr-Bremse. The device measures 144 x 66 x 40 mm, weighs 193 grams and features an LCD display, a rotary switch and one connector to which the supplied cables fit.
You connect the connector at the brake caliper and connect the matching cable to it. Using the rotary switch you select the sensor type, after which the display shows the measured voltage in volts . You compare that value against the reference table and so you know the wear percentage of the pad. This works without removal, so you can use the brake pad right up to the end.
KEY BENEFITS
IMPORTANT NOTES
Applications and functionality
With this tester you read a wear sensor whilst it remains fitted to the vehicle. The points below come from the device and the instruction card in the case lid.
Which sensors the wear sensor tester reads
- Continuous sensors from DAF, Iveco, Mercedes-Benz, Scania and others: A dedicated position on the rotary switch.
- Continuous sensors from MAN and Meritor: A second position on the same switch.
- 2-wire sensors: The versions that only signal at the end of pad thickness, with their own third position.
How to use it
- Connecting at the brake caliper: Disconnect the sensor connector and attach the matching cable to it.
- Selecting the correct cable: The set includes connectors for Renault, Volvo, Scania, Mercedes-Benz, Knorr-Bremse, DAF, EvoBus, Iveco, Hyundai, MAN and Wabco.
- Setting the sensor type: Using the rotary switch, which also switches off the device in the extreme position.
- Reading the value: The display shows the voltage; the reference table converts this to the wear level.
- The LEDs indicate: A green tick for good, a red cross for fault, and a battery symbol when power is running low.
Which sensor you connect it to
A wear sensor and a speed sensor are both located at the wheel, but they measure something entirely different. If you know which of the two you're holding, you'll also know which tester is included.
Wear sensor or speed sensor
- Wear sensor: Located in the brake pad and indicates how much material remains. This is the sensor the WST is designed for.
- Speed sensor: Located opposite a toothed ring on the wheel hub and transmits wheel speed to the braking system. The Jaltest (50004002) | SST (Speed Sensor Tester) is used for this purpose.
- Difference in signal: A wear sensor delivers a value that varies with brake pad thickness; a speed sensor delivers an alternating signal that rotates with the wheel.
Continuous or 2-wire
- Continuous sensor: Tracks across the full range as wear progresses, providing a real-time reading at any moment.
- Two-wire sensor: Only signals when the pad reaches the wear limit; produces no signal before that point.
- Why it matters: If set to the wrong position, you will get a reading that does not correspond to the sensor, which the reference table cannot interpret.
Package contents
- 1x Jaltest (50004011) | Wear Sensor Tester (WST)
- 1x Set of connection cables with brand-specific connectors
- 1x Instruction card showing the layout of display, LEDs and rotary switch
- 1x Case with cut foam insert
Technical specifications
| Specification | Description |
|---|---|
| Brand | Jaltest (Cojali) |
| Reference number | 50004011 |
| OE reference | K154433N50 Knorr-Bremse |
| Type | Sensor tester, standalone handheld device |
| Sensor types | Continuous wear sensors and two-wire sensors |
| Rotary switch positions | Off, continuous sensors from MAN and Meritor, continuous sensors from DAF, Iveco, Mercedes-Benz, Scania and others, and two-wire sensors |
| Display | LCD display in volts, plus LEDs for good, fault and battery |
| Connection | One port on the device for the supplied connection cables |
| Brands in the cable set | Renault, Volvo, Scania, Mercedes-Benz, Knorr-Bremse, DAF, EvoBus, Iveco, Hyundai, MAN and Wabco |
| Dimensions | 144 x 66 x 40 mm |
| Weight | 193 grams; approximately 1,270 grams including case and cables |
| Operating temperature | -10 °C to 40 °C |
| Design | Case with foam insert, connection cables and instruction card |
| Standalone operation | Yes, without connection to Jaltest Link or a computer |
To ensure you always have access to the latest software updates and releases for your Jaltest device, it's important that you register the correct distributor.
Only the authorized distributor can perform new software installations and updates. When you designate us as your distributor, we can handle this for you and guarantee that your device stays current and runs smoothly.
How does it work?
-
Download and complete the change form
You can find the form as a PDF file here. -
Send us the completed form
You can easily do this by email to support@astools.eu. -
We'll take care of the rest
With the form, we can notify Jaltest of the change and officially register you as our customer.
