Overview
The Baer Brakes 4302332MG is an SS4 rear brake system in Monster Green, pairing a four-piston S4 caliper with a 12 inch, 1-piece slotted, drilled, zinc-plated rotor. It is made for rear ends with a GM small pattern 10/12 bolt bearing-on-axle flange and a 5×4.75/5×5.00 wheel bolt pattern.
The backing plate holds the caliper and houses a 1-piece park brake shoe assembly, so the parking brake shoes sit in the same unit. Pads come in DR1 or HB100 types, and the dust and weather seals are T compliant. Stainless braided hoses are included.
Key features
- Four-piston S4 caliper manufactured in Phoenix, AZ
- CNC machined from US-sourced forged or billet aluminum
- Powder coated finish
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual seals for dust, weather and pressure
- Slotted, drilled, zinc-plated 1-piece rotor
- Stainless braided hoses included
Choosing the right setup
Rear brake changes often come as part of a wider wheel and tire plan. A rotor and caliper set with a 12 inch diameter occupies more of the space behind the wheel, so the template check should happen with the actual wheel and tire combination. Look at offset, backspacing and the tire width you run, because these decide how much room the caliper and hub area have.
The thinner rotor profile is a design point to weigh against cooling needs. Drivers who tow, descend steep grades or run heavy loads should think about pad compound and brake fluid quality, since heat builds faster under those conditions. Keep the parking brake in mind as well: the shoe assembly is part of the backing plate, so any adjustment affects both parking and service braking.
- Match pad compound to how the vehicle is used
- Use fresh brake fluid suited to the system
- Recheck wheel clearance after changing tire size
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302332MG |
| UPC | 90127952191 |
| Caliper | S4, four-piston, fixed |
| Caliper color | Monster Green |
| Rotor outside diameter | 12.0 inch |
| Rotor type | 1-piece, vented, slotted, drilled, zinc plated |
| Rotor thickness | 1.02 |
| Axle | Rear |
| Axle flange | GM small pattern 10/12 bolt |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Minimum wheel diameter | 16.0 inch |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included, 1-piece shoe assembly |
| Template | S113E |
| Grade type | Performance |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
The kit is built around the rear axle, with a GM small pattern 10/12 bolt bearing-on-axle flange and a 5×4.75/5×5.00 bolt pattern. Use the S113E template to check axle and wheel match.
Confirm your vehicle’s year, model and trim before ordering. Baer cannot guarantee fit across every wheel style, so compare the template against the wheel you intend to use.
Installation notes
Rotor thickness is 1.02, and with a 16.0 inch minimum wheel diameter the S113E template should be compared with the wheel before fitting. The park brake shoe assembly is housed in the backing plate, which also serves as the caliper mount. Bleed the braided hoses fully once the caliper is mounted and the system is filled.
What’s included
The kit includes the S4 caliper, the 12 inch 1-piece rotor, the backing plate with its park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables.
