If you're looking to upgrade your Mustang's braking system without going overboard, the SS4+ rear brake system from Baer is a solid choice. This setup sports a 4-piston caliper that’s mounted to a 13-inch two-piece rotor, which has been slotted and drilled for improved performance. The zinc plating on the rotor not only looks good but also helps resist corrosion, which is a nice touch for those of us who drive our cars in all kinds of weather.

One thing I really appreciate about this system is the attention to detail. Baer includes stainless steel brake hoses that are built to last, along with calipers that come with D.O.T. compliant dust and weather seals. You don’t want to be replacing parts every season, right? They’ve also used quality bearings and NAS high-grade stainless hardware for the pre-assembled rotor, so you know you’re getting something that’s built to hold up under pressure.

This SS4+ is designed for those of us who want a smaller package that fits 17-inch wheels. It’s perfect if you want to keep that classic look while still having the option to go bigger down the line. And yes, it comes with everything you need to get it installed, including the park brake cables and all the necessary hoses and fittings.

Fitment:

• Designed for 1979-1984 Ford Mustang with 5-lug wheels
• Also fits the 1993 Ford Mustang SVT Cobra with 5-lug wheels

Why go for the SS4+?

• You get all the benefits of Baer’s larger brake systems, just in a more compact form.
• It's ideal for anyone wanting to retain those 17-inch wheels or for the enthusiast who might want to swap back to stock later.
• Everything is included, so you won’t be scrambling to find parts mid-install.
• The hat is made from 6061 T-6 billet aluminum, anodized in black, and securely bolted to the rotor.
• High-grade U281 fine thread stainless hardware with captured nuts means you won’t have to worry about losing anything during installation.

The S4 Caliper Features:

• Four 10mm cross bolts for maximum stiffness—this thing isn’t flexing on you.
• Stainless steel abutments and noise suppression springs keep things quiet.
• Hard anodized aluminum pistons mean durability and performance.
• Internal crossover design for improved fluid dynamics.
• Dual seals—dust, weather, and pressure—meet D.O.T. specs, so you know they’re reliable.
• Each caliper features a machined logo that’s hand-painted, adding a personal touch.
• Uses a common 4-piston pad for easy replacements (P/N DR1), which is a lifesaver when it’s time for maintenance.
• Red powder coat finish looks sharp, and custom colors are available if you want to match your ride.
• Available for both front and rear, so you can keep that aesthetic consistent.
• Uses the proper banjo-style fittings—no pipe thread nonsense here.
• 100% made in the USA with sourced materials, which is something I always look for.

So if you're ready to enhance your Mustang's stopping power with a reliable, well-built system, the SS4+ is definitely worth considering.