Overview
The Baer Brakes Extreme Plus front brake system, part number 4301391MG in Monster Green, is a front disc kit for 2WD 1/2 Ton Chevy and GMC trucks from 1960 through 1986. It uses a 1-piece monoblock 6-piston 6S caliper on a 14-inch, 2-piece slot, drill, zinc plated rotor.
The kit is built to mount to a Cpp Nodular Iron 2.5 Inch Drop Modular Spindle with a 6-lug, 6×5.5 bolt pattern. Spindles are not included. The minimum wheel diameter is 18.0 inch and wheel fit cannot be guaranteed across every wheel style, so use template N117P to check clearance.
Key features
- 1-piece monoblock 6-piston 6S caliper, manufactured in Phoenix, AZ
- 14-inch 2-piece rotor with a billet aluminum hat
- Caliper body CNC machined from U.S. sourced 2618 aluminum forging
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons that Baer says minimize uneven pad wear
- Dual dust, weather and pressure seals
- Rotors pre-assembled with NAS high grade stainless hardware
- Billet aluminum hubs with premium bearings, Redline synthetic grease and billet dust caps
Spindle and axle prep
Because the spindles are a separate purchase, the front end needs to be ready before the caliper goes on. Inspect the spindle, steering knuckle and wheel bearings for wear, and clean the mounting surfaces so the hardware seats squarely. Old pitting or galling on a mounting face can cause runout that shows up as pedal pulsation.
Lift height and steering geometry also matter on a truck that has been lowered or fitted with a drop spindle. Check ball joints and tie rod ends after installation, and recheck the torque on the wheel studs after the first few drives.
- Clean the spindle mounting faces before assembly
- Inspect ball joints and tie rod ends
- Recheck wheel stud torque after the first drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301391MG |
| UPC | 90127877401 |
| Sold as | Kit |
| Axle | Front |
| Drive | 2WD |
| Caliper | 6S, 6-piston monoblock, fixed |
| Caliper color | Monster Green |
| Rotor type | 2-piece, vented, slotted, drilled, zinc plated |
| Rotor outside diameter | 14.0 inch |
| Rotor thickness | 1.25 |
| Pad type | FMSI D1247 |
| Lug count | 6 lug |
| Wheel bolt pattern | 6×5.50 |
| Wheel stud size | 1/2-20 x 2.25 inch |
| Minimum wheel diameter | 18.0 inch |
| Spindle type | Cpp Nodular Iron 2.5 Inch Drop Spindles |
| Spindles included | No |
| Hose material | Stainless steel |
| Template | N117P |
| Grade | Performance |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
It fits 1960–1986 Chevrolet C10, 1967–1986 Chevrolet C10 Suburban, 1960–1966 and 1987–1989 Chevrolet Suburban, 1966 GMC 1000, 1960–1965 GMC 1000 Series, 1975–1978 GMC C15, 1967–1974 GMC C15/C1500 and 1979–1986 GMC C1500.
It is for 2WD only, so four-wheel-drive versions are not covered. Chevrolet C10 models from 1987 on and GMC trucks outside the years above are also not covered. Check the year, model and trim against your truck before ordering.
Installation notes
Spindles are not included, so confirm the front spindle matches the Cpp 2.5 inch drop modular spindle with a 6-lug, 6×5.5BC pattern before fitting the caliper. Verify wheel clearance against template N117P, since 18.0 inch is the minimum wheel diameter. Brakes affect stopping, so test the pedal before regular driving.
What’s included
The kit includes the 6S Extreme Plus caliper, the pre-assembled 14-inch rotor, billet aluminum hubs with bearings and dust caps, all mounting brackets, stainless braided hoses and hardware.
Not included: The Cpp Nodular Iron 2.5 Inch Drop Modular Spindle. The kit is built to mount to it, and the spindles are not supplied.
