The EBC Ultimax2 rear pad, part UD1086, is a non-metallic OE-replacement pad made at EBC's Bristol, UK plant. The manufacturer states the compound contains zero steel fibre, which makes it far less abrasive to cast iron rotors than semi-metallic alternatives. It carries ECE R90 approval and an SAE J2975 Code N environmental rating, and its red Brake-In surface coating is designed to bed the pad in quickly after installation.
Compared with stock pads, the Ultimax2 is positioned as a direct OE equivalent with pre-fitted shims and chamfered, slotted friction faces aimed at quiet braking. Against cheaper bargain pads, the R90 approval is the main differentiator, since it certifies braking performance to a recognized European standard. Set expectations accordingly: the manufacturer positions this as a daily-driver pad, and at least one owner on a user forum reported heavier brake dust than expected, so it suits street use rather than track days.
The manufacturer describes the Ultimax2 as a daily driver pad for general street and highway use in hot and cold climates. It is not positioned as a track or performance compound, so buyers who track their RDX should look at EBC's sport-oriented pad lines instead.
Owners on user forums working on a 2013 RDX report that the three-prong clip goes inside the piston first, with the outer pad seated on the caliper mount before the caliper and inner pad are slid into place. Check that the pad spring has not slipped out of position.
Owners on user forums recommend greasing the three-prong clip, the sides of the pads where they contact the pad spring, and the pad ears, since the rear caliper system has many metal-to-metal contact points.
Rear pad replacement is a moderate DIY job. Owners on user forums describe lifting the vehicle at the manufacturer's jacking points, supporting it on jack stands, removing the wheels, removing the caliper guide pin bolts, and sliding the caliper off the bracket before swapping the pads. You will need a floor jack, jack stands, a socket set, a C-clamp or piston wind-back tool, brake cleaner, and caliper grease. Confirm your caliper type before starting, because some later RDX rear brakes use an electronic parking brake that requires a different procedure. Pads wear unevenly when the rotors are worn, so consider replacing them at the same time, and test the brakes gently before driving normally.
