Hawk Performance Brakes for the Saab 9-2X: Which Parts Fit

By Core Brake Parts Tech Team — Circleville, OH warehouse

Hawk Performance parts do fit the Saab 9-2X, because the 9-2X is built on the Subaru Impreza platform and shares its brake hardware family. The short list: Hawk HPS 5.0 front and rear pads for the naturally aspirated 2.5-liter car, and Hawk Talon drilled and slotted rear rotors for the 2005 model year. The catch is that the 9-2X had two engines per year and they did not always use the same brakes, so you order by engine, not just by model name.

Which Saab 9-2X Do You Have?

The 9-2X was sold for the 2005 and 2006 model years. Consumer Guide describes it as based on the Subaru Impreza, using the Impreza's bodyshell and powertrains, with the turbocharged Aero similar to the Impreza WRX. Every 9-2X came with all-wheel drive and antilock four-wheel disc brakes, so there are no rear drums to worry about on this car.

That table is the whole fitment story. A 2005 Aero with the 2.0 turbo and a 2006 2.5i can need different pads and rotors even though both say 9-2X on the hatch. Some parts catalogs also list a 2004 start year for these parts because the 9-2X went on sale in 2004 as a 2005 model; the listing fitment is what matters, so check the engine callout in the part title against your car before you order.

Hawk Parts That Fit the 9-2X

These are the Hawk Performance parts we currently stock with confirmed 9-2X fitment:

• Hawk HPS 5.0 front brake pads HB432B.661 - listed for the 2006 9-2X 2.5i.
• Hawk HPS 5.0 rear brake pad set HB452B.545 - listed for the 2006 9-2X 2.5i. The same part number is sold for the 2004-2005 Subaru WRX rear, which shows how closely these cars share rear brake hardware.
• Hawk Talon drilled and slotted rear rotor set HTC5139 - listed for the 2005 9-2X.

If you drive a 2005 or 2006 Aero, Hawk is not the only route. We also carry EBC parts for the 9-2X, covered below, and the full range sits in our brake pad collection and brake rotor collection.

What HPS 5.0 Actually Does

Hawk describes HPS 5.0 (High Performance Street 5.0) as a Ferro-Carbon compound built for street cars, with shorter stopping distances, better performance under heavy braking and a smooth pedal feel. Hawk rates it for 100 to 750 degrees F operating temperature, with an optimal range of 100 to 550 degrees F. In plain terms, it bites from a cold start on the way to work and still holds up through a hard back-road run.

The trade-offs are dust and track limits. Retailer spec sheets for HB452B.545 describe HPS 5.0 as producing moderate dust: cleaner than a typical original equipment pad, but dustier than a ceramic pad. It handles light track use if you watch for signs of overheating and give it cool-down time, but it is not a race compound. If your 9-2X sees regular track sessions, a street pad is the wrong tool, and if you care most about clean wheels, a ceramic pad is the better fit. Hawk also notes its compounds are not compatible with carbon ceramic rotors, which does not affect a 9-2X on iron rotors.

Hawk Talon Rotors vs. the EBC Options

Hawk's Talon rotors are cross-drilled and slotted, with what Hawk calls proprietary claw slots, and are engineered to original equipment specifications so they bolt on without modification. Hawk also applies its Magni coating, with extra coverage on and around the internal vanes and the rotor core where rust starts first. For a 9-2X that lives through salted winters, that coating matters more than the slot pattern.

For the turbo cars and the front axle, our current 9-2X rotor options are mostly from EBC:

For pads on the 2.0 turbo, we carry EBC Yellowstuff front pads DP41661R, the matching Yellowstuff rear set DP41687R, and EBC Redstuff ceramic front pads DP31661C if low dust is the priority. EBC calls Yellowstuff an aramid fiber compound with strong cold bite and a green fade threshold of 400 C (750 F), but it needs a longer bed-in, which EBC says happens naturally over the first 100 to 200 miles of city driving.

Symptoms That Say It Is Time

• A squeal that stops when you press the pedal: usually the pad wear indicator touching the rotor. Measure pad thickness at the next wheel-off.
• Steering wheel shake under braking: front rotor thickness variation. Pads alone will not fix it.
• Pulsing felt in the seat rather than the wheel: often points to the rear rotors.
• Grinding: pad material is gone and the backing plate is cutting the rotor. Plan on pads and rotors together.
• A deep lip on the rotor edge or heavy rust scale on the braking surface: common on older cars that sat, and a reason to replace rather than resurface.

A soft or sinking pedal is a different problem. That is a hydraulic question (fluid, a caliper, a hose or the master cylinder), not a pad compound question, and it should be diagnosed before any performance parts go on.

Doing the Job and What to Replace With It

Pads and rotors on the 9-2X are a standard Subaru-style job for a home mechanic with a jack, stands and basic hand tools. The calipers slide off their brackets, the brackets come off to free the rotors, and it is common to find a rotor seized to the hub on a car this age, so budget time for that. Torque every caliper and bracket bolt and the lug nuts to the values in the factory service manual rather than guessing.

• Replace pads in axle sets and put fresh rotors under new performance pads so the compound beds onto a clean, flat surface.
• Clean and lubricate the caliper slide pins, and replace the pad clips. A brake hardware kit is cheap insurance against noise and uneven wear.
• Check the rubber brake hoses for cracking or bulging. See our brake hose collection.
• Follow the bed-in procedure for the pad you chose. Hawk and EBC both publish their own, and skipping it is a common cause of judder complaints on new performance parts.

Frequently Asked Questions

Do Subaru WRX brake parts fit the Saab 9-2X?

Often, but not automatically. The 9-2X is built on the Impreza platform and some parts share numbers with the WRX, such as the HB452B.545 rear pad. Always match the exact part to your 9-2X year and engine rather than assuming a WRX part fits.

Which Hawk pad is best for a daily-driven 9-2X?

HPS 5.0 is Hawk's street compound and is the Hawk pad we stock for the 9-2X. It gives stronger bite than a typical original pad with good wear life, at the cost of more dust than a ceramic pad.

Can I use HPS 5.0 at a track day?

For light track use, yes, if you watch for overheating and allow cool-down laps. It is not a race compound and is not meant for long sessions at high temperature.

Does the 9-2X have rear disc brakes?

Yes. Every 9-2X came with antilock four-wheel disc brakes, so rear service means pads and rotors, not shoes and drums.

Are drilled and slotted rotors worth it on a 9-2X?

Slots help clear pad gas and debris and keep the pad surface fresh, and the coated Hawk Talon rotors resist rust. On a street car the coating and casting quality matter more than the drilling pattern.

Sources

1. Consumer Guide - 2005-06 Saab 9-2X - model years, trims, engines, horsepower, standard four-wheel antilock disc brakes, Impreza basis
2. Hawk Performance - HPS 5.0 - Ferro-Carbon compound, 100-750 F operating and 100-550 F optimal range, carbon ceramic rotor note
3. IAG Performance - Hawk HPS 5.0 rear pads HB452B.545 - WRX rear fitment, dust level, light track use
4. Hawk Performance Talon rotor announcement - claw slots, OE-spec engineering, Magni coating
5. EBC Brakes - Yellowstuff pads - aramid compound, cold bite, 400 C green fade threshold, 100-200 mile bed-in