Overview
The Baer Brakes SS4 Plus rear brake kit, part number 4302438FR, is a Fire Red rear disc brake kit for GM small pattern 10/12 bolt rear ends with bearing-on-axle mounting and flush mount bearing housings. A four-piston S4 caliper clamps a 13 inch, two-piece rotor that is slotted, drilled and zinc plated.
The backing plate on this kit is more than a caliper bracket: it houses a modern one-piece park brake shoe assembly. The kit is for owners who want a performance rear brake with a bright Fire Red caliper, mounted to wheels 17 inch or larger.
Key features
- Four-piston S4 caliper with hard anodized aluminum pistons and stainless steel abutments
- Two-piece slotted, drilled, zinc-plated rotor on a billet aluminum hat
- Dual seals that resist dust, weather and pressure
- Powder coated Fire Red caliper finish
- Rotors pre-assembled with stainless NAS high grade hardware
- Stainless braided hoses and hardware included with the kit
- Caliper manufactured in Phoenix, Arizona
Shopping for the right kit
A complete rear kit replaces more than the caliper, so compare what each kit includes before buying. Look for stainless braided hoses, pre-assembled rotors and a park brake shoe assembly, then check whether parking cables and pads are part of the package. Matching the kit to the axle flange and the wheel you run matters more than any single feature.
Keep the pad type in mind when comparing kits. Pads with the same FMSI designation share friction characteristics, so a pad that matches the caliper and rotor is the right starting point for street use. Fire Red is a finish choice only. Plan for a brake fluid flush after the system is opened, and bleed the new hoses to remove air before the first road test.
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302438FR |
| UPC | 90127952689 |
| Sold as | Kit |
| Caliper | S4, four-piston, fixed |
| Caliper color | Fire Red |
| Rotor type | 2-piece, vented, slotted, drilled, zinc plated |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Minimum wheel diameter | 17.0 inch |
| Axle flange | GM small pattern 10/12 bolt with flush mount bearing |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Brake pad FMSI number | DR1-C |
| Brake hose | Steel braided, DOT approved |
| Template | S135H |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
Fire Red 4302438FR is not tied to listed vehicles. Choose it by axle: GM small pattern 10/12 bolt rear ends with flush mount bearing housings and five lugs on a 5×4.75/5×5.00 hub.
Fit comes from the axle: GM small pattern 10/12 bolt rear ends with flush mount bearing housings and five lugs on a 5×4.75/5×5.00 hub. Confirm the axle and your vehicle’s year, model and trim before ordering.
Installation notes
Since the rotors are supplied pre-assembled, the stainless hardware and hat do not need to be built up on the bench. The park brake shoe assembly comes mounted in the backing plate, so the parking brake is part of the carrier work. Park brake cables are not in the box and must be sourced separately. Use the S135H template to confirm the caliper clears a 17 inch or larger wheel.
What’s included
This kit includes the Fire Red S4 caliper, the 13 inch two-piece rotor with billet aluminum hat, the backing plate with its park brake shoe assembly, and stainless braided hoses with hardware.
Not included: Park brake cables.
