If you're serious about drag racing, this rear brake system is what you need to get your heavy hitter off the line. We're talking about a setup that features four S4 4-piston calipers paired with 11-inch by 1-inch directional rotors—these are two-piece, slotted, drilled, and zinc plated for durability. Just a heads up: there’s no park brake in this system, so it’s strictly for drag racing. It’s designed for those fast, heavy cars that depend on their brakes to stage and launch effectively.

Now, let’s get into the nitty-gritty. This system is tailored for specific housing ends, so if you’re not sure what you’ve got, feel free to reach out. And don’t forget, your axle flange needs to be turned down to 5.75 inches for everything to fit snugly. We offer different piston sizes too. The larger 1.75-inch pistons give you maximum clamping force, but they can lead to a long pedal feel since they require more fluid. That’s why we’ve got a smaller 1.375-inch piston option, which has been a hit in classes like NMRA True Street where you might actually drive the car on the street a bit.

Keep in mind, this setup is meant for racing. If you decide to hit the streets, you’ll need to adjust for brake bias, so make sure to spend some time getting that right. And just so you know, the high-friction pads optimized for drag racing do tend to kick up more dust and noise than your average street pad.

Fitment specifics:

• Compatible with 9-inch Ford with small bearing housing ends and a 2.5-inch standoff.
• Rotors are drilled for 5 x 4.50 inch and 5 x 4.75 inch wheel bolt patterns.
• Make sure your axle flange is at 5.75 inches.
• Rotor register needs to be 2.780 inches.

Why go for the SS4+ Deep Stage Drag Race Systems?

• You get all the perks of our larger brake systems, just in a compact package that fits 15-inch wheels.
• Works with most dual beadlock wheels.
• Built specifically for heavy, fast cars.
• Can be street-driven if needed.
• Crafted from 6061 T-6 billet aluminum, anodized black and bolted to the rotor for extra strength.
• Features high-grade U281 fine thread stainless hardware with captured nuts.

Check out what the S4 Caliper brings to the table:

• Four 10mm cross bolts for maximum stiffness.
• Stainless steel abutments and noise suppression springs to keep things quiet.
• Hard anodized aluminum pistons for durability.
• Internal crossover design for better performance.
• Dual seals—dust, weather, and pressure—complying with D.O.T. specs.
• Hand-painted machined logo for a touch of class.
• Uses a common 4-piston pad for hassle-free replacements (P/N DR1).
• Clear powder coat finish available in standard colors like Clear and Fire Red, with custom options too.
• Available for both front and rear, so you can keep that look consistent.
• Utilizes correct banjo style fittings—no pipe threads here.
• 100% made in the USA with locally sourced materials!

So if you're looking to up your drag racing game, this brake system has got your back. It’s built for the serious racer who knows what they want.