The Hawk Performance HPS 5.0 rear brake pad set (part number HB604B.598) is the rear-axle component of Hawk's High Performance Street line, built for owners who want firmer stopping power on public roads than the factory BMW pads provide. Upgrading the rear pads on a 135i matters most when you drive hard, because consistent friction under repeated stops helps keep pedal feel predictable. Compared with a budget replacement, a pad from a performance brand is a better choice if you want the rear end to match the sharper front brakes of a modified car.
This part is listed for 2008-2013 BMW 135i models, and it is the rear pad, not a front set. The rear pads on the E82 135i are a comparatively straightforward DIY job. Owners on user forums report that the rear calipers can stay on the car, so the pads come out once the wheels are off and the car is safely supported on jack stands. Watch the pad wear sensor, which clips into the inner pad and can break if forced free, so release it gently and move it to the new pad. Long-tail searches for "135i rear brake pad replacement," "E82 HPS 5.0 rear pads," and "HB604B.598 install" point to this exact application.
Owners on user forums report that the rear pads on the E82 135i can be changed without removing the calipers, which keeps the job simpler than a front-axle swap.
Owners on user forums warn that the sensor can break if it is pried off the old pad. Release it carefully and transfer it to the new pad, or fit a new sensor if the old one is damaged.
Owners on user forums say normal driving will bed new pads to the rotors, and a deliberate bedding procedure speeds up the process. Confirm the manufacturer's recommended bedding steps before your first hard stop.
Rear pad replacement on the 135i is a moderate DIY task for someone comfortable with jack stands and basic hand tools. Lift and secure the car, remove the wheels, and clean the caliper bracket with a wire brush and brake cleaner. Use a torque wrench on the caliper bolts when you reassemble. Apply anti-squeal compound to the pad backing plates where the pads contact the caliper and bracket. Check the brake fluid reservoir level as you push the caliper piston back, since fluid can rise. Before driving, pump the brake pedal until it feels firm, then complete a careful bedding procedure.
