Honda Accord / Acura TSX Front Big Brake Kits: PA055 4-Piston vs PA015/PA035 6-Piston

The Paragon PA055 4-piston kit is the sharper choice for HPDE regulars and street-driven Accords or TSXs that see occasional track days: it fits on 17-inch wheels, carries real endurance racing credentials, and delivers a substantial step up from the OEM 282–300 mm rotors. The PA015/PA035 6-piston kit is the right call if you want the largest possible swept area, a wider rotor size selection topping out at 370 mm, or the pad-shape compatibility with Alcon CAR89 and AP Racing CP9668 calipers that makes sourcing hardcore track compounds straightforward.

Spec Comparison

PA055 4-Piston: Race-Proven, Right-Sized

The PA055's headline is its motorsport validation. The same caliper that bolts onto this Accord kit was raced by Team Honda Research West in Thunderhill endurance competition, which matters because endurance racing punishes brakes harder than almost any other format. That's not marketing language; it's a specific, documented use case that tells you the caliper can handle sustained heat cycles without fade-induced drama.

For the Accord and TSX application, Paragon pairs the PA055 with a 330 × 28 mm fully floating two-piece rotor. That's a meaningful jump over the OEM front rotors on most Accord trims, which range from 282 mm on four-cylinder cars up to 300 mm on certain V6 configurations. More swept area and the floating design together help manage the heat that kills stock iron rotors at the end of a long straight.

The 4-piston staggered bore layout (38.1 mm and 41.3 mm per side) is sized to work correctly with the OEM brake master cylinder and ABS system, and the whole kit is a direct bolt-on to the factory knuckle. If you're on 17-inch wheels, this is the kit that fits without a wheel upgrade.

Honest trade-offs: The 330 mm rotor is the only size offered for this caliper in this application. If you want to run larger iron or move up rotor sizes later, you'd need to swap to the PA015/PA035 body. The aftermarket pad ecosystem for the PA055 is solid but not as deep as the well-established Alcon/AP Racing pad shapes that the 6-piston kit shares.

PA015/PA035 6-Piston: Maximum Rotor, Maximum Flexibility

The 6-piston kit's main advantages are rotor choice and pad sourcing. Three rotor sizes, 343 mm, 355 mm, and 370 mm, let you match the setup to your wheel clearance and your ambitions. The 343 mm option still clears 17-inch wheels; step up to 355 mm or 370 mm and you need 18 inches, but you gain the kind of swept area that makes sense for longer sessions, heavier braking zones, or serious time attack use.

The caliper itself uses three staggered piston pairs (27 mm, 31.8 mm, and 38.1 mm), and Paragon notes that the staggered sizing is designed for even pad wear and improved brake balance across the pad face. The PA015 and PA035 use the same caliper body; the PA035 accommodates the larger 370 mm rotor while the PA015 handles the 343 mm and 355 mm options.

The pad shape is shared with the Alcon CAR89 and AP Racing CP9668, two calipers with deep competition pad catalogues. That means when you outgrow the included Paragon P3 compound, you have immediate access to purpose-built track compounds from multiple manufacturers without hunting for obscure fitments.

The 6-piston kit also extends Acura TSX coverage to include the second-generation TSX (CU2, CU4, 2009–2014), which the PA055 kit does not cover.

Honest trade-offs: The caliper is heavier at 6.5 lbs versus the PA055's 5.4 lbs, and the larger rotor options add unsprung weight accordingly. The published per-corner figure for the 355 mm configuration is 32.2 lbs total. The larger rotors also demand 18-inch wheels, so budget for that if you're currently on 17s. Neither Paragon nor the product listing claims specific motorsport racing validation for the PA015/PA035 calipers in the way the PA055 carries the Team Honda Research West association.

If you're shopping a similar decision for a different platform, the same PA055 vs PA015/PA035 comparison is covered for the BRZ, FR-S, and 86 in this guide, which walks through the same caliper family in that application.

How to Choose

Start with your wheel size. If you're on 17-inch wheels and want to stay there, the PA055 with its 330 mm rotor is the only option that fits without a wheel change. The 6-piston kit's 343 mm rotor also fits 17-inch wheels, so if you're open to either caliper, that configuration keeps wheel costs out of the equation.

Think about your session length and brake zone intensity. For one or two HPDE sessions a year on a front-wheel-drive or all-wheel-drive Accord, the PA055 is more than capable. The PA015/PA035 with a 355 mm or 370 mm rotor becomes more relevant if you're running full race weekends, back-to-back sessions, or tracks with long, hard braking zones.

Consider pad sourcing for the long term. If you anticipate moving to dedicated track compounds quickly, the 6-piston kit's shared fitment with Alcon CAR89 and AP Racing CP9668 pads is a genuine convenience. The PA055 pad ecosystem is good, but narrower.

TSX owners on a second-gen car (2009–2014): the PA055 kit does not cover CU2/CU4 chassis. The PA015/PA035 kit does. That alone settles it for those buyers.

For the look: Both kits are a visual upgrade over the OEM setup and both use the same high-quality monobloc billet construction. The 6-piston caliper is a larger presence behind the wheel, which matters if curb appeal is part of the brief.