After four months of daily driving and 4 track days, the Vector2 pads retained 59.1% of their original friction material - a clear measure of mixed-use durability.
The FactionFab team tested that claim on a manual 2022 Subaru WRX equipped with Vector2 brake pads and V2 rotors at all four corners. The measurable question was simple: how much usable friction material would remain after the complete street-and-track cycle?
The same front pads stayed on the WRX throughout the documented use cycle. At the end, we removed all four and measured them against an unused set of the same model.
59.1% of the original friction material remained
The Vector2 front pad set averaged 40.9% material used, and every pad retained more than half of its original friction thickness.
One set of pads, four months of mixed use
Over four months of regular Bay Area commuting, the WRX completed 2 days at Thunderhill West, one day at Sonoma Raceway, and one day at Thunderhill East.
The track days happened throughout the daily-driving period, with no separate pad swap between street and circuit use. The compound repeatedly moved from cold starts and stop-and-go traffic into sustained high-temperature braking, then returned to ordinary commuting.
What the pads looked like after removal
At the end of the cycle, the FactionFab team removed the front pads from the WRX for inspection. The friction faces remained intact across all four pads, and the surfaces showed evidence of repeated street and track heat cycles.
The photographs document the pads' condition at teardown. The next step was to quantify the remaining friction material with repeatable measurements.
A quantitative analysis of friction-material wear
Our team measured each used pad with a dial caliper at four positions: left, right, center top, and center bottom. We then measured an unused reference set for the same application at the same locations. The left and right readings were taken before the factory taper begins. Because the caliper reads total pad thickness, including the steel backing plate, we subtracted the backing plate's measured 0.252-inch thickness from every new and used reading before calculating wear. This keeps each percentage focused on usable friction material.
The same center-top location is shown on the unused and used pads above. Measuring matching locations made the change in friction-material thickness directly comparable. Using four locations on every pad then gave us a more complete view of total wear than a single center reading could provide.
Track use changes the wear equation
Every braking event converts the vehicle's kinetic energy into thermal energy at the pad-rotor interface. Because kinetic energy follows 1/2 mv2, braking from a higher speed creates a disproportionate increase in heat. On the street, the system usually has time to cool before the next major stop. On track, that recovery window shrinks.
As surface temperature rises, the friction material has to maintain a stable coefficient of friction, often represented as mu, while the rotor stores and rejects heat through its mass, vanes, and surrounding airflow. The compound also has to withstand repeated heating and cooling cycles without consuming material at an excessive rate.
Heat saturation, outgassing, and fade
If heat enters the system faster than the rotor, pad, and airflow can remove it, the brake system begins to saturate. At elevated temperature, volatile compounds released near the friction surface can form a temporary gas boundary layer. That layer reduces effective pad-to-rotor contact and is the effect commonly described as outgassing.
If the compound moves outside its useful temperature range, its coefficient of friction can fall, producing the loss of braking effectiveness known as brake fade. A capable hybrid pad must manage those high-temperature demands while also controlling its wear rate through repeated thermal cycles.
Measured wear remained closely grouped
| Pad | Left | Right | Center top | Center bottom | Average |
|---|---|---|---|---|---|
| Pad 1 | 44.4% | 32.3% | 37.4% | 40.2% | 38.6% |
| Pad 2 | 41.2% | 37.2% | 40.4% | 40.4% | 39.8% |
| Pad 3 | 47.6% | 38.6% | 43.4% | 42.9% | 43.1% |
| Pad 4 | 44.9% | 38.4% | 43.6% | 41.0% | 42.0% |
| Set average | 44.5% | 36.6% | 41.2% | 41.1% | 40.9% |
Average material used ranged from 38.6% to 43.1% across the four pads, a spread of only 4.5 percentage points. The center-top and center-bottom averages were also nearly identical at 41.2% and 41.1%. Together, those measurements reinforce the headline result: the complete front set finished the documented cycle with substantial, consistently measured friction material remaining.
A robust result for a true mixed-use pad
Taken together, the documented use cycle and measured wear support the Vector2's intended role as a true mixed-use pad. One front set moved between the commute and the circuit without swaps and returned with 59.1% of its original friction material.
For the enthusiast who drives to the track, runs the event, and drives home, the result shows the durability expected from a genuine street-and-track compound, with substantial measured pad life available for more track days and continued daily driving.
What we learned
- Install 1 New Vector2 front pads
- Mixed use 2 4 months daily + 4 track days
- Inspection 3 Pads removed 4 points per pad
- Measured result 4 59.1% friction material remaining
- Projection 5 8-9 track days ~9 months daily