Overview
The Baer Brakes 4302333B is a black rear brake kit from the SS4 Plus line, with a four-piston S4 caliper clamping a 13 inch two-piece slotted and drilled rotor. The kit mounts to a GM 10/12 bolt bearing-on-axle housing with a 5×4.75/5×5.00 wheel bolt pattern. Confirm the axle flange matches your rear end before buying.
A hybrid bearing-on-axle flange and a hard anodized piston set form the core of this build. The park brake shoe is a single-piece unit tucked into the Baer backing plate, which also serves as the caliper mount. The pads are DR1-C type, and stainless braided hoses are supplied with the kit.
Key features
- Black powder-coated four-piston S4 caliper
- Hard anodized aluminum pistons with stainless steel abutments
- Dual seals for dust, weather and pressure
- Slotted, drilled, zinc-plated 13 inch rotor with billet aluminum hat
- Pre-assembled rotor with NAS high grade stainless hardware
- Performance grade caliper and rotor pairing
Pad and rotor pairing
Pad compound and rotor material work as a pair, so changing one often means reviewing the other. DR1-C pads suit performance-minded rear brakes, but bedding and operating temperature should match how you drive. Slotted rotors clear debris and gas, which helps pad contact, though some pad compounds still wear faster against them.
Brake hoses and the park brake shoe are often replaced alongside the rotor during a rear overhaul. Stainless braided hoses hold their shape better than rubber, but they still need inspection for chafing near the frame. Check the parking brake adjustment after installation and recheck it after the first few drives.
- Bed in new pads with gentle stops
- Inspect the park brake shoe linings for wear
- Check hose routing for rub points
- Replace worn hardware with new stainless fasteners
- Recheck wheel lug torque after initial drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302333B |
| UPC | 844165028734 |
| Axle | Rear |
| Axle flange | GM small pattern 10/12 bolt, bearing on axle (hybrid) |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Caliper | S4, four-piston, fixed |
| Caliper color | Black |
| Pad type | DR1-C (FMSI DR1-C) |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Rotor type | 2-piece, vented |
| Rotor material | Iron with aluminum hat |
| Rotor surface | Slotted, drilled and zinc plated |
| Minimum wheel diameter | 17.0 inch |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included |
| Template | S135H |
| Emission code | 6 |
| Grade | Performance |
| Country of origin | US |
Vehicle fitment
The kit fits a rear axle with a GM small pattern 10/12 bolt bearing-on-axle flange, the pattern used on Buick, Olds and Pontiac rear ends.
Front axles and other flange patterns are not covered here. Check your vehicle’s year, model and trim against the kit before buying.
Installation notes
Park brake cables are not part of the package, so they need to be sourced for the vehicle. Because wheel style and manufacturer affect clearance, Baer advises comparing the S135H template with the wheel you intend to run. A qualified technician should handle the installation.
What’s included
The kit contains the S4 caliper, the backing plate with the one-piece park brake shoe assembly, the 13 inch two-piece rotor with stainless hardware, and stainless braided hoses with their hardware.
Not included: Park brake cables, lug nuts and a front rotor.
