Overview
The Baer Brakes 4302470FR puts a Fire Red finish on the Extreme Plus rear disc brake system, sized for Chevrolet C10 and GMC 2WD trucks from 1960 through 1988. It uses the OE large pattern 10/12 bolt C-clip housing ends and suits 6 lug wheels on a 6×5.5 inch bolt circle.
A one-piece monoblock caliper, designated 6S with six pistons, clamps a 14 inch two-piece rotor that is slotted, drilled and zinc plated. Baer’s backing plate carries the caliper along with a one-piece park brake shoe assembly. Stainless braided hoses and NAS stainless hardware are included with the rotors.
Key features
- Monoblock 6S caliper with six stainless steel pistons
- Caliper precision machined from 2618 aluminum forging, then powder coated
- Abutments and noise suppression clips are stainless steel
- Pistons are staggered to even out pad wear
- Dual dust, weather and pressure seals
- Two-piece zinc-plated rotor, slotted and drilled, on a billet aluminum hat
- Pre-assembled rotors and stainless braided hoses included
Before you buy
Rear disc brakes on a light truck do most of their work under hard stops and during long downhill runs, when heat builds in the rotor and pads. A caliper with six pistons spreads clamping force across more of the pad, which helps the pad wear evenly. Stiffer hydraulics also mean pedal feel depends on the whole system, so the master cylinder, hoses and fluid matter as much as the caliper.
Because a disc conversion changes wheel clearance and brake load, plan on checking the surrounding parts. Wheel bearings, ball joints and tie rod ends often show wear once the brakes are upgraded, and they are easier to inspect while the wheels are off. Park brake cables are a common replacement item on older trucks, since originals may stretch or seize after years outside.
- Inspect pad thickness and rotor surface at each wheel service
- Look for cracks around rotor slots and drilled holes
- Check braided hoses for chafing, bulges or seeping fittings
- Replace the master cylinder if pedal travel changes after installation
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302470FR |
| UPC | 90127878927 |
| Caliper | 6S one-piece monoblock, six pistons, floating |
| Caliper color | Fire Red |
| 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
It fits Chevrolet C10 (1960–1986), C10 Suburban (1967–1986), R10 (1987) and R10 Suburban (1987–1988), GMC 1000 (1966 and 1960–1965), GMC 1000 Series, GMC C15 Suburban (1975–1978), GMC C15/C1500 and its Suburban (1967–1974), GMC C1500 Suburban (1979–1986), GMC R1500 Suburban (1987–1988), and GMC Suburban (1960–1966).
Not covered: C1500 and K1500 trucks from 1987 onward other than the R10 and R1500 Suburban entries, and four-wheel-drive trucks, as this kit is 2WD. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The 14 inch rotor is designed for wheels 18 inch or larger, with an 18.0 inch minimum wheel diameter. Compare the rotor and caliper against template N135P before ordering. Park brake cables are not included. Professional installation is advised, and brake hydraulics need proper bleeding before the truck is driven.
What’s included
Included are the 6S monoblock caliper, two-piece rotors with NAS stainless hardware, the backing plate and park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables.
