The EBC UD606 is a rear disc brake pad from the Ultimax2 range, the OE-replacement line EBC makes at its Bristol, UK plant. It is fitted to the 10+ Lexus GX460 4.6 V8. The range is a non-metallic pad with zero steel fibre, which the manufacturer says makes it gentler on cast iron rotors. It carries ECE R90 approval, and the manufacturer grades the compound Code N for environmental performance and GG for braking effect. For a GX owner who mostly drives on pavement and wants quieter, cleaner rear braking at a lower price than genuine parts, it is a practical upgrade over worn stock pads.
Owners on user forums say the GX470 and GX460 use the same rear pads, so this part gets discussed as a GX470 option too, but confirm the part number against your VIN before ordering. Rear pad changes are more involved than the front. The caliper has to be partly removed, with bolts on its back side, so it can slide up and clear the pads. Owners also report that the rotor can stick because the parking brake shoes sit inside the rotor hat, so backing off the parking brake adjustment helps. Searches for "UD606 rear brake pads," "GX460 4.6 V8 quiet rear pads," and "Ultimax2 non-metallic GX460" will bring up this exact part.
Owners on user forums report that the GX470 and GX460 share the same rear pads. Confirm the UD606 part number against your vehicle before ordering, since the manufacturer's application listing is the authoritative reference.
The manufacturer states that all Ultimax pads sold in the USA are shimmed, so noise-reducing shims are part of the design for this range.
The manufacturer says the Brake-In surface coating is intended to speed up bedding-in of the new pads against the rotors.
The manufacturer positions Ultimax2 as a general replacement pad for cars, vans and SUVs, so it is aimed at street driving rather than track or sustained high-heat use.
Rear pad replacement on the GX460 is a moderate job for a home mechanic with basic hand tools and a torque wrench. Plan to remove the caliper bolts on the back of the caliper, slide the caliper up, and swap the pads. Owners on user forums warn that the caliper bracket bolts can back out over time, so use the correct torque and a thread locker as directed, and check the bracket for damage. Before fitting the rotor, back off the parking brake shoes inside the hat so the rotor can come off freely. Bed the new pads in gently, as the Brake-In coating is designed to help with this.
