Overview
The Baer Brakes SS4 Plus 4302339CY is a complete rear disc brake kit in Comp Yellow, built around a 4-piston S4 caliper and a 13 inch two-piece slotted, drilled rotor. It is made for rear axles with large pattern 10/12 bolt C-clip housing ends and 5 lug wheels on a 5×5 inch bolt circle.
It fits 2WD Chevrolet C10 and R10 trucks and GMC 1000, C15 and C1500 trucks, including Suburban models, from 1960 through 1988. The caliper is made in Phoenix, AZ from US-sourced forged or billet aluminum, and the rotor arrives pre-assembled.
Key features
- Four-piston floating S4 caliper with hard anodized aluminum pistons
- Two-piece slotted, drilled, zinc-plated rotor on a billet aluminum hat
- Powder coated Comp Yellow finish
- Stainless steel abutments and noise suppression clips
- Dual dust, weather and pressure seals that are T compliant.
- Park brake shoe assembly housed in Baer’s backing plate, which also serves as the caliper mount
- Stainless braided DOT approved hoses and hardware included
Choosing the right setup
Swapping a drum rear axle to disc brakes on an older C10 changes how the whole braking system works. The rotor, caliper and park brake shoe have to clear the axle housing, the backing plate and the wheel together, so measure each part before the kit goes on. Older trucks often carry worn wheel bearings and hubs, and those are worth inspecting when the brakes are replaced.
Pads and the rotor wear together, so plan on checking both at regular service intervals. Look for uneven thickness, heavy scoring or a lip at the rotor edge, and watch for pad material that has thinned unevenly across the face. Keep the caliper slides clean and free of corrosion, since a seized slide will drag and heat the rotor.
- Confirm wheel clearance before mounting the rotor
- Inspect hubs and wheel bearings during installation
- Use fresh brake fluid when the system is refilled
- Check the park brake shoe adjustment after the first drive
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302339CY |
| UPC | 90127878644 |
| Sold as | Kit |
| Drive | 2WD |
| Axle | Rear |
| Axle flange | GM large pattern 10/12 bolt C-clip housing ends |
| Wheel bolt pattern | 5 lug, 5×5.00 |
| Caliper | S4, 4-piston, floating |
| Caliper color | Comp Yellow |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Rotor type | 2-piece, vented |
| Rotor surface | Slotted, drilled and zinc plated |
| Pad type | DR1-C (FMSI) |
| Minimum wheel diameter | 17.0 inch |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included; park brake cables not included |
| Template | S135H |
| Grade | Performance |
| Country of origin | USA |
Vehicle fitment
Manufacturer fitment lists 12 entries for this kit: 1960–1986 Chevrolet C10; 1967–1986 Chevrolet C10 Suburban; 1987 Chevrolet R10; 1987–1988 Chevrolet R10 Suburban; 1966 GMC 1000; 1960–1965 GMC 1000 Series; 1975–1978 GMC C15 Suburban; 1967–1974 GMC C15/C1500 and C15/C1500 Suburban; 1979–1986 GMC C1500 Suburban; 1987–1988 GMC R1500 Suburban; and 1960–1966 GMC Suburban.
The kit is made for 2WD trucks, and no 4WD models are covered. Model years and models outside the 2WD Chevrolet and GMC trucks named above, including other GM truck generations, are not covered. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The park brake shoe assembly is integrated into the backing plate, while park brake cables are excluded from the kit. Baer advises using the S135H template to compare the planned wheel with the 13 inch rotor, since the minimum wheel diameter is 17.0 inch. Brake work is safety-critical: bed in new pads and test the brakes at low speed before normal driving.
What’s included
The S4 caliper, the two-piece rotor pre-assembled with NAS high grade stainless hardware, the backing plate with 1-piece park brake shoe assembly, and stainless braided hoses with hardware.
Not included: park brake cables.
