Overview
The Baer Brakes 4302340B is a rear disc brake kit for 60-87 GM C10 2WD trucks with C-clip axles and a 6 lug, 6×5.50 inch wheel pattern. The kit pairs a four-piston S4 caliper with a 13 inch two-piece rotor.
The backing plate doubles as the caliper mount and houses a one-piece park brake shoe assembly, so the park brake sits inside the rear system. Rotors come pre-assembled with NAS high grade stainless hardware, and braided hoses with hardware are included. Baer cannot guarantee wheel fit across every style, so measure your wheels against template S135H before fitting the kit.
Key features
- Four-piston S4 floating caliper finished in black with powder coated surface
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual seals for dust, weather and pressure
- CNC machined from US-sourced forged or billet aluminum
- Two-piece slotted, drilled, zinc-plated rotor with billet aluminum hat
- Park brake shoe assembly built into the backing plate
- Braided hoses rated DOT approved
Long-term care
A rear disc setup on a C10 truck sees steady use from road salt, moisture and occasional heavy loads. Keeping the caliper free of debris and checking the pads on a routine basis helps the system stay predictable. Small problems like a sticking slide or a torn boot are easier to fix before they score the rotor.
Brake fluid absorbs moisture over time, which can lower its boiling point and make the pedal feel soft under hard use. Flushing it on a regular schedule is a simple habit that protects the whole system. Keep a record of service dates so the next check is not forgotten.
- Inspect caliper boots and slides during each pad change
- Replace brake fluid at regular service intervals
- Check the rotor for grooves, scoring or heat cracks
- Keep the park brake adjusted after rear service
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302340B |
| UPC | 844165043812 |
| Wheel bolt pattern | 6×5.50 inch |
| Lug count | 6 lug |
| Axle flange | C-clip axles |
| Caliper | S4, four-piston, floating, black |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Rotor type | 2-piece, vented, slotted, drilled, zinc plated |
| Rotor hat material | Aluminum |
| Brake pad FMSI number | DR1-C |
| Template | S135H |
| Minimum wheel diameter | 17.0 inch |
| Brake hose DOT approved | Yes |
| Park brake | Included |
| Applications | GM C10 trucks 60-87 |
| Country of origin | US |
Vehicle fitment
The manufacturer fitment list covers these entries: 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, 1967-1974 GMC C15/C1500 Suburban, 1979-1986 GMC C1500 Suburban, 1987-1988 GMC R1500 Suburban and 1960-1966 GMC Suburban.
Trucks from 1989 onward, such as later C/K pickups, are not on this list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Check template S135H against your wheels before mounting, because the S4 setup is sized for wheels 17.0 inch in minimum diameter or larger. Bleed the brake hydraulics after the hoses are connected and test pedal firmness before driving, since brakes are safety critical.
What’s included
The kit includes the S4 four-piston caliper, the 13 inch two-piece rotor with pre-assembled hardware, the backing plate with park brake shoe assembly, and braided hoses with hardware.
Not included: Lug nuts, park brake cables and the front rotor must be sourced separately.
