Overview
The Baer Brakes 4302333FR is a Fire Red SS4 Plus rear disc brake kit for GM small pattern 10/12 bolt rear axles that use a bearing-on-axle flange. The kit uses a fixed four-piston S4 caliper and a 13 inch two-piece slotted, drilled, zinc-plated rotor, matched to a 5×4.75/5×5.00 inch bolt pattern with five lugs.
Baer’s backing plate mounts the caliper and also houses a modern one-piece park brake shoe assembly, so the parking brake comes with the system. The housing ends are non-flush mount, and the listed minimum wheel diameter is 17 inches. Baer cannot promise fit for every wheel, so compare its S135H template with your wheel first.
Key features
- Fire Red powder coated caliper on a CNC machined S4 body
- Two-piece rotor, slotted and drilled with zinc plating
- Billet aluminum hat on the rotor assembly
- Dual dust, weather and pressure seals
- Hard anodized pistons and stainless steel abutments
- Stainless hoses and hardware come in the kit
Rotor, pad and hose care
A rear disc conversion works as a system, so the rotor, pads, caliper and hoses should be considered together. Pads wear faster on steep trail descents and in mud, so check thickness at regular intervals instead of waiting for a squeal. Rotors can develop grooves or heat checks over time, and a deeply scored rotor should be replaced. Clean the rotor face and pad surfaces after any water crossing or mud run, and keep grease and oil away from the friction surfaces.
Steel braided hoses resist swelling better than older rubber lines, but they still need inspection for chafing, kinks and leaks where they pass near the suspension. Brake fluid should be flushed on a schedule, because moisture in old fluid lowers its boiling point and can cause a soft pedal under heavy braking. After any caliper, hose or pad change, bleed the system and pump the pedal until it is firm before driving.
- Torque wheel fasteners after the first few trail runs
- Check the park brake for changes in lever travel at each service
- Replace pads in matched sets on the same axle
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302333FR |
| UPC | 90127952009 |
| Caliper | S4, four pistons, fixed |
| Caliper color | Fire Red |
| Rotor diameter | 13.0 inch |
| Rotor construction | Two-piece, vented |
| Rotor surface | Slotted, drilled and zinc plated |
| Rotor thickness | 0.81 |
| Minimum wheel diameter | 17.0 inch |
| Lug count | 5 lug |
| Wheel bolt pattern | 5×4.75/5×5.00 inch |
| Axle | Rear, GM small pattern 10/12 bolt, bearing on axle (Buick/Olds/Pontiac) |
| Housing ends | Non-flush mount |
| Pad FMSI number | DR1-C |
| Hose material | Steel braided, DOT approved |
| Park brake | Included; park brake cables not included |
| Grade | Performance |
| Template | S135H |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
It is designed for rear ends with the GM small pattern 10/12 bolt bearing-on-axle flange and a 5×4.75/5×5.00 inch bolt pattern. Confirm fit for your vehicle’s year, model and trim before ordering.
Compare the bearing-on-axle flange with your axle before ordering, since C-clip rear ends need a different kit. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Confirm the bearing-on-axle flange on your rear end before ordering. Park brake cables are not included, so arrange them separately. Use the S135H template and the 17 inch minimum to confirm wheel clearance before assembly.
What’s included
The kit includes the fixed S4 caliper, two-piece rotors pre-assembled with stainless hardware, Baer’s backing plate with the park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables and wheels.
