Next Level Performance
August 24, 2026 • 10 min read
Porsche 718 Cayman GT4 brake upgrades are about one thing: keeping the pedal firm lap after lap. The GT4’s 4.0-liter flat-six spins to 8,000 rpm and pushes a roughly 3,200-pound coupe to 188 mph, so its 380 mm steel rotors and six-piston front calipers work hard on a road course. The factory brakes are excellent for the street, but repeated high-speed stops bake the OEM one-piece rotors and stock pads until the pedal goes long. At NLP Performance in Tampa, FL, the fix our GT4 customers reach for is not a bigger rotor — it’s a lighter two-piece rotor, a race-compound pad, and high-temperature fluid. This guide rounds up the best two-piece rotors and race brake pads for the 2016–2021 Porsche 718 (and 981) Cayman GT4.
Our Verdict
For a GT4 that sees real track time, GiroDisc two-piece slotted rotors are the strongest upgrade — lighter, cooler, and rebuildable.
GiroDisc’s floating two-piece rotors shed unsprung weight and manage heat far better than the OEM one-piece discs, and the friction rings are replaceable so you rebuild instead of rebuy. Road-driven 2020–2021 GT4 owners who want a simpler direct swap should look at the SHW lightweight rotor, then add Hawk DTC-70 race pads front and rear for track days.
Shop Our Top Pick →Why the 718 Cayman GT4 Needs a Brake Upgrade
The 718 Cayman GT4’s brakes fade from heat, not from a lack of size. Both GT4 generations run 380 mm (15-inch) steel rotors at all four corners, clamped by aluminum monobloc calipers — six pistons front, four rear. That hardware hauls the 414-hp 982 GT4 (385 hp in the 2016 981) down from triple-digit speeds with ease on the street. The problem shows up after three or four hot laps: the one-piece cast rotor and OEM pad soak up more heat than they can shed, brake fluid boils, and the pedal travels toward the floor.
The most effective GT4 brake package keeps the factory 380 mm diameter and calipers but attacks heat three ways: a two-piece rotor with an aluminum center hat that runs cooler and resists coning and cracking, a race-compound pad that holds friction at 1,000°F-plus, and a high-temperature brake fluid with a dry boiling point above 590°F. Do those three and the GT4 pedal stays firm from green flag to checkered.
Two-piece floating rotors keep the OEM 380 mm diameter but run cooler than the stock one-piece disc.
Best Porsche 718 Cayman GT4 Brake Upgrades (2016–2021)
These five upgrades cover the GT4 braking system from the disc out to the pad. We ranked them by how much track-day benefit they deliver per dollar, starting with the two-piece rotors that make the biggest difference and finishing with the race pads that every serious lapper should be running.
Replaceable slotted friction rings mean a rebuild costs a fraction of a new rotor.
DTC-70 is a high-torque endurance compound built to hold friction past 1,000°F.
Porsche 718 Cayman GT4 Brake Upgrades Compared
| Kit | Type | Best For | Fits | Price |
|---|---|---|---|---|
| GiroDisc Front RotorsTop Pick | 2-pc slotted, front | GT4 Clubsport track | 16–19 GT4 (981/718) | $1,750.00 |
| GiroDisc Rear Rings | 2-pc disc rings, rear | GT4 CS / 991 Cup rear | 718 GT4 / 911 GT3 | $1,030.00 |
| SHW Lightweight Front Rotor | 2-pc drilled, front | Road 718 GT4 swap | 20–21 718 GT4 4.0L | $565.20 |
| Hawk DTC-70 Front Pads | Race pad, front | Track front bite | 14–19 GT3 / 16 GT4 | $366.04 |
| Hawk DTC-70 Rear Pads | Race pad, rear | Track brake balance | 05–16 Boxster/Cayman | $235.84 |
Two-Piece vs. OEM One-Piece Rotors: What Changes
A two-piece rotor splits the job the OEM disc does alone. The factory GT4 rotor is a single cast-iron piece where the friction ring and the mounting hat are one casting. A two-piece rotor bolts a cast-iron friction ring to a separate aluminum center hat. That single change delivers three measurable wins on track.
Less weight where it hurts. Swapping the cast hat for aluminum trims roughly 2–4 lb of rotating, unsprung mass per corner. That is the most valuable weight on the car to remove — it sharpens steering response, helps the dampers, and lowers the load the brakes and suspension carry. Better heat control. The aluminum hat isolates the wheel bearing and hub from rotor heat, while the floating mount lets the iron ring grow and shrink freely, which suppresses the coning and cracking that kill one-piece rotors on track. Lower long-term cost. When the friction rings wear or crack, you replace just the rings and reuse the hats and hardware — a fraction of the price of a complete rotor.
The aluminum center hat is where two-piece rotors shed weight and isolate hub heat.
Key Specifications — GiroDisc Front Rotors
What We Like
- + Sheds 2–4 lb of unsprung, rotating weight per corner
- + Floating iron ring resists coning and heat cracking
- + Replaceable friction rings cut long-term track costs
Things to Consider
- – Priced for the track; overkill for a street-only GT4
- – Confirm your GT4 runs OEM steel brakes, not PCCB
Brake Pads: Why DTC-70 for Track, Not the Street
Hawk DTC-70 is a race-only pad, and that distinction matters more than any rotor choice. DTC stands for Dynamic Torque Control, and the 70 is Hawk’s highest-torque endurance compound. It holds roughly a 0.65 coefficient of friction across a wide, high operating window — excellent for repeated late braking from 150 mph into a hairpin. The trade-off is that it needs heat to work: from cold it feels wooden, it dusts heavily, and it can squeal in traffic.
For a GT4 that mixes canyon drives with occasional track days, keep a street or fast-street compound on the car for daily use and bolt in the DTC-70 fronts (HB848) and rears (HB665) for lapping. Running the same DTC-70 compound front and rear keeps brake bias consistent as temperatures climb, which is exactly what you want when you are trail-braking a mid-engine car to the apex. Always bed a fresh set of race pads with a series of firm stops before you push hard.
Match DTC-70 front and rear to keep brake balance predictable at track temperatures.
Installation & Track-Prep Tips From Our Tampa Shop
A GT4 brake refresh is a straightforward bolt-on, but a few details separate a firm pedal from a scary one. In our Tampa, FL shop we tell GT4 owners to treat pads, rotors, fluid, and lines as one system:
- Flush with high-temp fluid. Before any track day, bleed in a racing fluid with a dry boiling point above 590°F. Boiled fluid, not weak brakes, is the number-one cause of a fading GT4 pedal.
- Bed new pads and rotors properly. Perform a manufacturer bed-in cycle — a series of hard stops from about 60 to 10 mph — to lay an even transfer layer before you go hot. Skipping this causes vibration and uneven bite.
- Confirm steel vs. PCCB. These rotors fit cars with OEM steel brakes. If your GT4 has the optional Porsche Ceramic Composite Brake (PCCB) setup, the calipers and rotor sizes differ — verify before ordering.
- Consider stainless brake lines. Braided lines firm up pedal feel by removing the flex of rubber hoses under high pressure — a cheap upgrade that pairs well with race pads.
- Inspect after every event. Check friction-ring thickness, pad material, and hardware torque. Two-piece rotors make this easy because you can replace just the rings when they reach their wear limit.
Frequently Asked Questions
What are the best brake upgrades for the Porsche 718 Cayman GT4?
The two most effective upgrades are two-piece floating rotors and a track-compound brake pad. GiroDisc and SHW two-piece rotors cut roughly 2 to 4 lb of unsprung weight per corner and run cooler than the OEM one-piece discs, while Hawk DTC-70 race pads hold friction past 1,000 degrees F. Add a high-temperature brake fluid and the GT4 pedal stays firm through a full track session.
Does the 718 Cayman GT4 need bigger brakes for track use?
No. The GT4 already uses 380 mm steel rotors with six-piston front and four-piston rear calipers, which is plenty of clamping capacity. Track fade comes from heat, not size, so the proven fix is to keep the 380 mm diameter and upgrade to two-piece rotors, race pads, and high-temp fluid rather than fit a larger big brake kit.
What size are the Porsche 718 Cayman GT4 brake rotors?
The 718 Cayman GT4 uses 380 mm (about 15 inch) steel rotors at all four corners, clamped by aluminum monobloc calipers with six pistons up front and four in the rear. Cars ordered with the optional PCCB ceramic package instead run larger 410 mm front and 390 mm rear discs, which require different pads and rotors.
Are Hawk DTC-70 pads good for street driving?
No. Hawk DTC-70 is a race-only endurance compound with a high, roughly 0.65 coefficient of friction that needs heat to work. On the street it bites poorly when cold, dusts heavily, and can squeal. Use a street or fast-street pad for daily driving and reserve DTC-70 for track days.
How much do 718 Cayman GT4 brake upgrades cost?
At NLP Performance, GT4 brake parts range from around $236 for a set of Hawk DTC-70 rear race pads to about $1,750 for GiroDisc two-piece front rotors. A complete rotor-and-pad refresh, front and rear, typically lands in the $2,000 to $4,000 range depending on whether you choose full race rotors or lightweight replacements.
Do two-piece rotors actually improve GT4 performance?
Yes. A two-piece rotor with an aluminum center hat removes roughly 2 to 4 lb of rotating, unsprung mass per corner, improves heat dissipation, and lets the iron friction ring expand freely so it resists coning and cracking. The friction rings are also replaceable, which lowers the long-term cost of running the car on track.
Build a Brake Package That Survives the Session
Shop two-piece rotors, race pads, high-temp fluid and more for your 718 Cayman GT4 at NLP Performance.
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