Overview
The Baer Brakes 4301621R is a red Extreme Plus front disc brake kit for 1971 to 1988 Chevrolet and GMC 1/2 ton trucks, Blazers and Suburbans. It is sold with OE front disc brake axle and knuckles and covers GM K5/K10 truck and SUV applications from 71-87.
The Extreme Plus pairs a 1-piece Monoblock, 6-piston, 6S caliper with a 14 inch, 2-piece slotted, drilled and zinc plated rotor, making it a performance front brake system. The caliper is machined from 2618 aluminum forging sourced in the United States, has a powder coated red finish, and uses FMSI number D1247 pads.
Key features
- 1-piece Monoblock, 6-piston, 6S caliper, manufactured 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 for dust, weather and pressure.
- 2-piece slotted, drilled, zinc plated rotor with a billet aluminum hat.
- Rotors arrive pre-assembled with NAS high grade stainless hardware.
- Mounting brackets, stainless braided hoses and hardware are included.
Matching the axle parts
A front disc conversion works best when the axle, knuckles and steering components are checked as a group. Inspect the ball joints, tie rod ends and wheel bearings before the new caliper goes on, since play in those parts shows up quickly once braking loads change. Wheel offset also affects caliper clearance, so the template comparison should be done before the wheel is mounted.
Powder coated calipers resist everyday grime well, but exposed areas near the rotor can discolor from heat over time. Wipe the caliper clean after rough trail use and look for chips that could let moisture reach the metal.
- Check brake line routing after the caliper is mounted
- Re-torque hardware after the first few drives
- Confirm the hub seals are intact before final assembly
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301621R |
| UPC | 90127854013 |
| Sold as | Kit |
| Caliper | 1-piece Monoblock, 6-piston, 6S |
| Caliper type | Fixed |
| Caliper color | Red |
| Caliper material | 2618 aluminum forging |
| Axle | Front |
| Rotor outside diameter | 14.0 inch |
| Rotor construction | Vented, 2-piece |
| Rotor thickness | 1.25 |
| Rotor surface | Slotted, drilled and zinc plated |
| Hat | Billet aluminum |
| Minimum wheel diameter | 18.0 inch |
| Lug count | 5 Lug |
| Wheel bolt pattern | 6×5.50 |
| Pad FMSI number | D1247 |
| Template | N085P |
| Grade type | Performance |
| Country of origin | USA |
Vehicle fitment
The manufacturer fitment list for this kit covers the following vehicles: 1987 Chevrolet Blazer; 1971–1986 Chevrolet K10; 1975–1986 Chevrolet K10 Suburban; 1975–1986 Chevrolet K5 Blazer; 1987 Chevrolet V10; 1987–1988 Chevrolet V10 Suburban; 1975–1987 GMC Jimmy; 1975–1978 GMC K15; 1975–1978 GMC K15 Suburban; 1971–1974 GMC K15/K1500; 1971–1974 GMC K15/K1500 Suburban; 1979–1986 GMC K1500 Suburban; and 1987 GMC V1500.
The list does not include 1988 and later full-size Chevrolet or GMC trucks and Blazers (except the V10 Suburban shown), or models from 1970 and earlier. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The 14 inch rotor fits most 18 inch or larger wheels, with a minimum wheel diameter of 18.0 inch. Because Baer cannot guarantee fit with every wheel style, use template N085P to compare the caliper and rotor against your wheel before installation. Brake work is safety-critical, so have the installation checked by a qualified technician.
What’s included
The kit includes the red 6S caliper, the 14 inch 2-piece rotor pre-assembled with NAS high grade stainless hardware, all mounting brackets, stainless braided hoses and hardware, and the front disc brake axle and knuckles.
Not included: wheels and tires.
