Overview
The Baer Brakes 4302343S SS4 is a silver 12 inch rear brake system with a 4-piston S4 caliper, built for GM small pattern 10/12 bolt rear axles that use a bearing on axle layout with flush mount bearing housing ends. It fits 5 lug wheels on a 5×4.75 and 5×5 bolt circle.
The SS4 pairs its caliper with a one-piece slotted, drilled, zinc plated rotor. The Baer backing plate serves as the caliper mount and also houses a one-piece park brake shoe assembly. The kit takes the DR1 or HB100 pad type, with FMSI number DR1-C.
Key features
- S4 four-piston caliper in silver, manufactured in Phoenix, AZ
- CNC machined caliper from forged or billet aluminum with a powder coated finish
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual seals for dust, weather and pressure
- One-piece slotted, drilled, zinc plated rotor
- Stainless braided brake hoses included
Pads, hoses and upkeep
Rear pads and rotors wear together, and braided hoses do little to change how quickly pad material is used. Pad compound affects bite, fade resistance and noise, so choose a pad that suits how the vehicle is driven, whether on pavement, on the trail or both. Keep the pad type and FMSI rating consistent when replacing pads, and make sure the pad backing sits square in the caliper.
The parking brake built into the backing plate works with the rear shoes rather than the caliper, so adjust and test it after any rear brake service. Lubricate the caliper slide points and check the boots for tears whenever the pads are changed. Inspect the braided hoses for chafing, bulging or cracked fittings at each pad change, and replace any hose that shows damage.
- Check rotor thickness and surface for scoring at each pad change
- Inspect slide pins and boots for corrosion or tears
- Replace pads on both sides of an axle to keep braking even
- Test the parking brake after any adjustment
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302343S |
| UPC | 844165044017 |
| Sold as | Kit |
| Axle | Rear |
| Axle flange | GM small pattern 10/12 bolt with flush mount bearing |
| Axle housing flange type | Hybrid, 3.150 inch bearing on axle, flush mount |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Min wheel diameter | 16.0 inch |
| Rotor outside diameter (rear) | 12.0 inch |
| Rotor type | 1-piece, vented |
| Rotor material | Iron |
| Rotor surface | Slotted, drilled and zinc plated |
| Rotor thickness | 1.02 |
| Caliper | S4, 4 pistons, fixed |
| Caliper color | Silver |
| Pad FMSI number | DR1-C |
| Hose material | Steel braided, DOT approved |
| Includes park brake | Yes |
| Template | S113E |
| Grade | Performance |
| Emission code | 6 |
| Country of origin | US |
Vehicle fitment
The kit is built for GM small pattern 10/12 bolt rear axle flanges with flush mount bearing housing ends and a 5×4.75/5×5.00 bolt pattern. Confirm fit for your vehicle’s year, model and trim before ordering.
Rear axles with other flange designs or bolt patterns are not covered. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Park brake cables are not included, so confirm how your parking brake connects before installing. Use the S113E template to check wheel clearance against the 16.0 inch minimum wheel diameter. Perform brake work with the wheels removed and the vehicle on stands, and test pedal firmness before driving.
What’s included
- S4 4-piston caliper in silver
- 12.0 inch one-piece slotted, drilled rotor
- Backing plate with one-piece park brake shoe assembly
- Stainless braided brake hoses
Not included: Park brake cables and lug nuts.
