Overview
The Baer Brakes 4302343MG is a rear SS4 brake kit with a 4-piston S4 caliper finished in Monster Green and a 12.0 inch, 1-piece slotted, drilled, zinc plated rotor. It is made for rear axles with a GM small pattern 10/12 bolt flange and flush mount bearing, using a 5×4.75/5×5.00, 5 lug wheel pattern.
A backing plate forms the caliper mount and holds a modern 1-piece park brake shoe assembly. The caliper uses hard anodized aluminum pistons with stainless steel abutments and noise suppression clips, and dual seals guard against dust, weather and pressure. The kit fits most wheels 16 inches or larger.
Key features
- 4-piston S4 caliper with hard anodized aluminum pistons
- Stainless steel abutments and noise suppression clips
- Dual seals for dust, weather and pressure
- 1-piece slotted, drilled, zinc plated vented rotor
- Powder coated finish; caliper components CNC machined from US sourced forged or billet aluminum
- Manufactured in Phoenix, Az
- Stainless braided hoses included; DR1 or HB100 pad types
Before you buy
A rear disc kit replaces the caliper, rotor and mounting hardware as a unit, so the axle flange, bearing style and wheel clearance need to line up before ordering. Measure the existing rotor thickness and inspect the hub face for rust or wear, since both affect how the new rotor seats and runs true. Many owners also replace the park brake shoes and cables during the same job, because that system is hard to inspect once the rest of the brake is assembled.
Pad choice matters as much as the hardware. The pad types for this kit are DR1 or HB100, and the FMSI number DR1-C should be checked against any pads you plan to buy. Pads and rotor wear together, so a matched set usually gives more predictable stopping and less rotor scoring than mixing compounds. Route the braided hoses clear of the axle and suspension before bleeding the system.
- Measure rotor thickness and hub face before ordering
- Plan to source park brake cables separately
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302343MG |
| UPC | 90127952870 |
| Format | Kit |
| Axle | Rear |
| Axle flange | GM small pattern 10/12 bolt with flush mount bearing |
| Caliper | S4, 4 pistons, fixed |
| Caliper color | Monster Green |
| Rotor type | 1-piece |
| Rotor outside diameter | 12.0 inch |
| Rotor thickness | 1.02 |
| Rotor construction | Vented |
| Rotor surface | Slotted, drilled and zinc plated |
| Brake hose | Steel braided, DOT approved |
| Pad FMSI number | DR1-C |
| Pad types | DR1 or HB100 |
| Template | S113E |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Minimum wheel diameter | 16.0 inch |
| Park brake shoe | 1-piece, included |
| Park brake cables included | No |
| Grade | Performance |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
Fit is set by the rear axle flange and wheel: GM small pattern 10/12 bolt with flush mount bearing, a 5×4.75/5×5.00 bolt pattern and a minimum wheel diameter of 16.0 inch. Confirm fit for your vehicle’s year, model and trim before ordering.
Installation notes
The park brake cables are not included and must be supplied separately. Baer cannot guarantee wheel fit across every wheel style, so compare the S113E template with your wheel before mounting. A technician experienced with rear disc and park brake work should perform the installation.
What’s included
The kit includes the S4 4-piston caliper, the 1-piece rotor, the backing plate with its park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables.
