Measuring the length of a wear indicator

1. A device for measuring a length of a wear indicator on a brake assembly, the device comprising:

a housing defining a track;

a moveable component comprising a plurality of bearings configured to move along the track based on contact with the wear indicator;

a sensor configured to detect a displacement of the moveable component; and

processing circuitry configured to determine the length of the wear indicator based on the displacement of the moveable component detected by the sensor.

2. The device of claim 1 , further comprising:

a measurement tube including the track and an opening, wherein the opening is configured to receive the wear indicator; and

a spring configured to compress in response to inserting the wear indicator into the measurement tube,

wherein the spring and the moveable component are configured to move along the track.

3. The device of claim 2 ,

wherein the sensor is configured to generate a signal based on compression or expansion of the spring caused by displacement of the moveable component, and

wherein the processing circuitry is configured to determine the length of the wear indicator based on the signal.

4. The device of claim 2 , further comprising:

a light positioned near the opening; and

a light switch for turning on or off the light.

5. The device of claim 2 ,

wherein a portion of the housing at least partially surrounds the opening, and

wherein the portion of the housing is configured to make contact with the brake assembly when the opening receives the wear indicator.

6. The device of claim 1 , wherein a spring is configured to compress or expand based on movement of the plurality of bearings.

7. The device of claim 1 , wherein the track includes a bend of at least forty-five degrees.

8. The device of claim 1 , wherein the device is a handheld, cordless device.

9. The device of claim 1 , further comprising:

a battery; and

a charging circuit coupled to the battery and configured to wirelessly receive electrical power for charging the battery.

10. The device of claim 1 , wherein the brake assembly is part of a wheel assembly that includes a tire, the device further comprising:

a tire pressure sensor configured to measure a pressure of the tire; or

a tire tread gauge configured to measure a tread of the tire.

11. The device of claim 1 ,

wherein the sensor includes a linear displacement sensor including a moveable rod configured to move based on the displacement of the moveable component, and

wherein the linear displacement sensor is configured to generate a signal based on a displacement of the moveable rod.

12. A device comprising:

means for moving a plurality of bearings along a track based on contact with a wear indicator on a brake assembly;

means for detecting a displacement of the means for moving; and

means for determining the length of the wear indicator based on the displacement of the means for moving.

13. The device of claim 12 , further comprising means for compressing in response to the displacement of the means for moving,

wherein the means for detecting the displacement of the means for moving comprises means for generating a signal based on compression or expansion of the means for compressing.

14. The device of claim 12 , further comprising means for wirelessly receiving electrical power for a charging a battery.

15. The device of claim 12 , further comprising means for measuring a pressure of a tire.

16. A device for measuring a length of a wear indicator on a brake assembly, the device comprising:

a plurality of bearings configured to move based on contact with the wear indicator;

a spring configured to compress or expand based on displacement of the plurality of the bearings;

a housing, wherein the housing forms:

a track for the plurality of bearings and the spring; and

an opening at one end of the track, wherein the opening is configured to receive the wear indicator;

a sensor configured to generate a signal based on compression or expansion of the spring caused the displacement of the plurality of the bearings; and

processing circuitry configured to determine the length of the wear indicator based on the signal.

17. The device of claim 16 , wherein the housing and the track include a bend of at least forty-five degrees.

18. The device of claim 16 ,

wherein a portion of the housing at least partially surrounds the opening, and

wherein the portion of the housing is configured to make contact with the brake assembly when the opening receives the wear indicator.