If you're looking to upgrade your Mustang's braking system, the Baer SS4 rear brake kit is a solid choice for those 1994-2004 solid axle models. This setup features a beefy 4-piston caliper paired with a 12-inch one-piece rotor that’s got both slots and drills for better heat dissipation and performance. You’ll appreciate the billet backing plate—it serves as both a caliper mount and houses a modern park brake assembly. This isn’t just any park brake; it’s a Banksia design that works way better than those old drum-in-hat systems. Plus, the kit comes complete with park brake cables, so you’re not hunting down extra parts.
Fitment:

• Specifically designed for 1994-2004 Ford Mustangs with an 8.800-inch solid rear axle—sorry, IRS owners, this one’s not for you.
• This kit has a 5 x 4.500 wheel bolt pattern, so make sure your wheels match up.

Why go for the SS4?

• The 12-inch directionally vaned rotor is a perfect fit if you’re also running Baer’s Track4 front brake system, giving you a cohesive look and feel.
• That fully machined billet backing plate isn’t just for show; it holds everything together and keeps things running smoothly.
• The Banksia park brake assembly uses the same shoe as the late model Corvette C5/C6, so you know it’s reliable.
• Everything you need is included—hoses, fittings, hardware—so you can get right to the install.
• These 12-inch rotors fit most 15-inch wheels, but it’s wise to double-check with a template to be sure.

What’s cool about the S4 caliper?

• It’s built tough with 4 cross bolts for max stiffness, so you know it’s not going to flex under pressure.
• The stainless steel abutments and noise suppression springs mean quieter operation—no one likes squeaky brakes.
• Hard anodized aluminum pistons are designed to last, and the internal crossover design helps with consistent braking performance.
• Those dual seals keep dust and moisture out, meeting D.O.T. specs to keep you street legal.
• Each caliper features a machined logo that’s hand-painted for a personal touch.
• It uses a common 4-piston pad for easy replacements—just grab part number DR1 when it’s time to swap them out.
• Standard colors are Red, Black, or Silver, but if you want something custom, they’ve got you covered.
• Available for both front and rear, so you can keep that matching look all around.
• The rear systems come with a drum-in-hat park brake, and for c-clip style axles, you’ll get Baer’s Verislide self-centering brackets.
• They use the correct banjo style fittings, avoiding any pipe thread issues—because who needs that headache?
• And just to top it off, everything is 100% MADE IN USA with materials sourced right here at home!

So, if you’re ready to take your Mustang’s braking to the next level, this SS4 kit is definitely worth considering. It’s built for performance, reliability, and a bit of style, too.