Overview
The Baer Brakes 4302339GB is a rear SS4 Plus disc brake system for 2WD Chevrolet and GMC C10 and C15 trucks with a 5 lug, 5×5.00 inch wheel pattern. The kit pairs a 4-piston S4 caliper with a 13 inch, 2-piece slotted and drilled zinc-plated rotor, a backing plate that houses a park brake shoe assembly, and braided hoses, aimed at owners who want a stronger rear brake setup on a classic truck.
The backing plate serves as the caliper mount and holds a modern 1-piece park brake shoe assembly. Rotors come pre-assembled with NAS high grade stainless hardware. The S4 calipers use hard anodized aluminum pistons with stainless steel abutments and noise suppression clips, and the kit uses DR1-C pads. The kit is CNC machined from US sourced forged or billet aluminum and made in Phoenix, AZ.
Key features
- 4-piston, floating S4 caliper with dual dust/weather and pressure seals
- 13 inch, 2-piece slotted, drilled, vented rotor with a billet aluminum hat
- Zinc-plated rotor surface and powder coated Grabber Blue caliper finish
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Integrated 1-piece park brake shoe assembly housed in the backing plate
- DOT approved steel braided hoses and stainless hardware
Parking brake and cable setup
The park brake shoe assembly sits inside the backing plate, so the parking brake works through the rear hub rather than a separate drum. Because cables are not included, the setup depends on sourcing a cable set that matches the truck’s mounting points and routing. Routing cables cleanly keeps them clear of exhaust heat and moving suspension parts.
Adjust the park brake after the wheels are fitted and the shoes are set, then check that the lever holds the truck on a slope. A parking brake that drags while driving usually points to cable tension rather than the shoes, so adjust it before blaming the rotor. Inspect cables for stretch and corrosion during brake service.
- Check cable routing before final tightening
- Confirm lever travel after adjustment
- Replace frayed or seized cable sleeves
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302339GB |
| UPC | 90127878682 |
| Application | GM C10 trucks, 1960–1987 |
| Drive | 2WD |
| Axle | Rear |
| Wheel bolt pattern | 5×5.00 inch, 5 lug |
| Caliper | S4, 4-piston, floating |
| Caliper color | Grabber Blue |
| Rotor type | 2-piece, slotted, drilled, vented, zinc plated |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Rotor hat | Billet aluminum |
| Pad FMSI number | DR1-C |
| Minimum wheel diameter | 17.0 inch |
| Brake hose | DOT approved, steel braided |
| Park brake | Included |
| Template | S135H |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
The manufacturer fitment list for this kit covers 1960–1986 Chevrolet C10 trucks, 1967–1986 Chevrolet C10 Suburban, 1987 Chevrolet R10, 1987–1988 Chevrolet R10 Suburban, 1960–1965 GMC 1000 Series, 1966 GMC 1000, 1960–1966 GMC Suburban, 1967–1974 GMC C15/C1500, 1967–1974 GMC C15/C1500 Suburban, 1975–1978 GMC C15 Suburban, 1979–1986 GMC C1500 Suburban, and 1987–1988 GMC R1500 Suburban.
The list does not include 4WD trucks or any model years outside the ranges shown. Compare your truck’s year, model and trim with the entries above before choosing this kit.
Installation notes
Rotors arrive pre-assembled with the stainless hardware, and the S4 calipers and braided hoses are included. The 13 inch SS4 Plus suits most wheels 17 inch or larger, so check your wheel against the S135H template before mounting. Park brake cables are not included, so a separate cable set is needed to connect the park brake. Have a qualified technician bleed the hydraulic lines after installation.
What’s included
The kit includes the 4-piston S4 calipers, 13 inch 2-piece rotors pre-assembled with NAS high grade stainless hardware, the backing plate with its 1-piece park brake shoe assembly, and stainless braided hoses with hardware.
Not included: park brake cables.
