EBC Yellowstuff is an aramid fibre-based brake compound with a high brake effect from cold, and the DP42047R applies that compound to the rear axle of the BMW i8 1.5 Turbo/Electric. The compound's cold grip is the main draw, and the manufacturer's stated green-fade threshold is 400°C (750°F), which it ties to the maximum temperatures seen in fast street driving. Buyers planning dedicated track days should know that the manufacturer no longer recommends Yellow for dedicated track use, and it points track-focused drivers toward its Bluestuff compound instead. Searches for EBC i8 rear pads, Yellowstuff DP42047R, and aramid rear pad upgrades typically come from owners who want more stopping force on a hybrid that is heavy at the rear.
Fitment is where buyers should slow down. Listings describe the 2014-and-later i8 1.5 Turbo/Electric, but year coverage differs between sources, so confirm your VIN with the manufacturer before ordering. Bedding in matters for this compound. The manufacturer's bed-in chart assigns Fade 1 + 2 to Yellowstuff, with Fade 3 optional for track use. Fade 1 begins with drive 50 to 100 miles on public road/highway normal driving to allow the pads to mate up to the disc, followed by a set of stops and cooling time.
The manufacturer no longer recommends Yellowstuff for dedicated track use. For track work, it recommends its Bluestuff compound. Yellow is still used by some racers on lighter cars, but the manufacturer's guidance favors Bluestuff for track driving.
The manufacturer states that the Yellowstuff compound is 100% R90 approved for street use in European markets.
The manufacturer's chart lists Fade 1 and Fade 2 for Yellowstuff, with Fade 3 optional if the pads will see track use. Fade 1 involves a 50 to 100 mile road run, followed by eight stops from 80 mph to 30 mph with cooling between stops.
Owners on user forums who have worked on other BMW models with an electronic parking brake report that rear pistons must be wound back after the parking brake motor is retracted, either through service mode with a diagnostic tool or with a dedicated caliper tool. Put the vehicle in service mode, remove the caliper while the electronic parking brake stays on, then compress the caliper with a tool and replace the pads. Forum posts also say that the OEM rear pads come with new caliper clips and screws with each set, while the EBC pads do not, so buy fresh hardware. The wear sensor on the inner pad is fragile. Use a flat head screwdriver to pop it off the caliper, and do not pull on the wires. Owners also recommend engaging the parking brake to reset it after the job to avoid a parking brake message on the first drive. Tools mentioned for similar models include a 13mm socket and 17mm open wrench for the caliper bolts, T-5 for the parking brake bracket screws, and a T-45 to release the parking brake. Confirm the i8's exact procedure before starting.
