Overview
The Baer Brakes 4301621B is a black Extreme Plus front disc brake kit for 1971 to 1988 Chevrolet and GMC 1/2 ton trucks, Blazers and Suburbans. It covers GM K5 and K10 truck and SUV applications from 71-87 and is sold with OE front disc brake axle and knuckles.
The Extreme Plus pairs a 1-piece Monoblock, 6-piston, 6S caliper with a 14 inch, 2-piece slotted, drilled and zinc plated rotor. Baer positions the system as a performance front brake kit. The caliper is machined from 2618 aluminum forging sourced in the United States, carries a powder coated black finish, and the pads use FMSI number D1247.
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 black 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.
Pads, fluid and bleeding
A front brake swap changes the hydraulic and pad setup, so the rest of the system should be checked before the truck returns to service. Brake fluid that has absorbed moisture can lower the boiling point and make the pedal feel soft under heavy braking, so a fresh fill is a sensible part of the job whenever lines are opened.
Pad choice matters on a truck that tows or runs off road. Harder compounds last longer but can feel less grabby when cold, while softer compounds bite sooner and wear faster. Bed in new pads and rotors gradually, and recheck the caliper bolts and hose clearances after the first short drives.
- Bleed the system until the fluid runs clear
- Confirm pedal feel before road use
- Check hose routing against steering travel
- Recheck caliper bolts after initial drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301621B |
| UPC | 90127854006 |
| Sold as | Kit |
| Caliper | 1-piece Monoblock, 6-piston, 6S |
| Caliper type | Fixed |
| Caliper color | Black |
| 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 suits most 18 inch or larger wheels, and the minimum wheel diameter is 18.0 inch. Since wheel style affects fit, check the caliper and rotor against your wheel with template N085P before mounting. Brake work is safety-critical, so have the installation checked by a qualified technician.
What’s included
The kit includes the black 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.
