Overview
The Baer Brakes 4302470MG is a complete Extreme Plus rear disc brake kit in Monster Green for 1960–1988 Chevrolet C10 and GMC C/R-series trucks with 2WD drive. It mounts to the rear axle using the OE large pattern 10/12 bolt C-clip housing ends and matches 6 lug, 6×5.5 inch wheels.
The kit centers on a one-piece monoblock caliper with six pistons, designated 6S, clamping a 14 inch two-piece slotted, drilled, zinc-plated rotor. Baer’s backing plate is also the caliper mount, and it houses a one-piece park brake shoe assembly, so the parking brake comes with the kit. Stainless braided hoses and NAS stainless hardware are included, and the rotors are pre-assembled.
Key features
- One-piece monoblock, six-piston 6S caliper made in Phoenix, Arizona
- CNC machined from US-sourced 2618 aluminum forging with a powder coated finish
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons designed to minimize uneven pad wear
- Dual seals guard against dust, weather and pressure
- Two-piece slotted, drilled, zinc-plated rotor with billet aluminum hat
- Stainless braided hoses and stainless hardware included
Rear brake upgrade basics
A rear disc conversion on an older C10 changes more than the stopping hardware. The drums it replaces were sized for a different load path, so the new caliper, backing plate and hub-mounted rotor shift how force reaches the axle. Before the kit goes on, inspect the rear hard lines and flush the fluid, since corrosion in old lines can lower pressure during a stop.
Staggered-piston monoblock calipers are usually paired with fresh pads at the same time, because uneven wear appears quickly on a pad that was never bedded to a new rotor. Check the rotor face for scoring after the first few drives, and replace a slotted rotor once it reaches its minimum thickness rather than pushing it further.
- Source park brake cables before the install begins
- Measure hub and hat runout before final torque
- Keep the N135P template with the parts for wheel checks
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302470MG |
| UPC | 90127878989 |
| Caliper | 6S one-piece monoblock, six pistons, floating |
| Caliper color | Monster Green |
| Caliper material | CNC machined 2618 aluminum forging, powder coated |
| Rotor outside diameter | 14.0 inch |
| Rotor type | 2-piece, slotted, drilled, zinc plated |
| Rotor construction | Vented |
| Rotor thickness | 1.25 |
| Hat | Billet aluminum |
| Minimum wheel diameter | 18.0 inch |
| Brake pad | FMSI D1247 |
| Template | N135P |
| Lug count | 6 lug |
| Bolt pattern | 6×5.50 inch |
| Hose material | Stainless steel |
| Park brake | Included; park brake cables not included |
| Drive | 2WD |
| Axle | Rear |
| Country of origin | USA |
| Sold as | Kit |
Vehicle fitment
Baer’s manufacturer fitment list for this kit includes 1960–1986 Chevrolet C10 and 1967–1986 C10 Suburban, 1987 and 1987–1988 Chevrolet R10 and R10 Suburban, 1966 and 1960–1965 GMC 1000 and 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 list does not cover 1987 and later Chevrolet C1500 or K1500 trucks apart from the R10 entries, and it does not cover four-wheel-drive trucks, since the kit is specified 2WD. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The 14 inch rotor needs wheels 18 inch or larger, with 18.0 inch as the minimum. Compare the rotor against template N135P before mounting, since wheel styles vary in clearance. Park brake cables are not included, so source them separately. Have a qualified technician install the system and bleed the hydraulics, because brake work is safety-critical.
What’s included
The kit includes the 6S monoblock caliper, the 14 inch two-piece rotors pre-assembled with NAS stainless hardware, the backing plate with its park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables.
