Overview
The Baer Brakes Extreme Plus rear brake kit, part number 4302270FR, is a complete rear disc brake system for GM small pattern 10/12 bolt bearing-on-axle rear ends with a 5×4.75/5×5.00 bolt pattern. It pairs a 1-piece Monoblock 6-piston 6S caliper in Fire Red with 14 inch rotors, and it is sold as a kit.
Baer’s backing plate serves as the caliper mount and also houses a modern 1-piece park brake shoe assembly. The caliper is CNC machined from US sourced 2618 aluminum forging and manufactured in Phoenix, Az.
Key features
- 1-piece Monoblock 6-piston 6S caliper, CNC machined from 2618 aluminum forging
- Powder coated Fire Red finish
- Anti-noise clips and abutments made of stainless steel alongside the pistons
- Staggered pistons designed to limit uneven pad wear
- Dual dust, weather and pressure seals
- 2-piece slotted, drilled, zinc-plated rotor with billet aluminum hat
- Rotors pre-assembled with NAS high grade stainless hardware
- Stainless braided hoses included
Before you buy
A rear disc brake kit replaces the complete rear braking hardware, so the rear end, axle flange, bolt pattern and wheel must all agree before the parts are ordered. Measure the existing rear end and wheel setup, then compare them with the kit’s stated requirements and the template. Fitment problems usually show up as wheel clearance issues or bolts that do not seat properly, and both are easier to catch before installation.
Many owners replace the rotors, pads and hoses together when converting or rebuilding a rear end, since the components wear at similar rates and are sized to work as a set. Because the park brake shoe assembly is part of the backing plate, check whether your existing park brake cables will connect correctly before removing the old hardware.
- Confirm the axle flange and bolt pattern match the rear end
- Check wheel clearance against the caliper and rotor
- Plan for park brake cables and a full system bleed
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302270FR |
| UPC | 90127951613 |
| Caliper | 6S, 1-piece Monoblock, 6 pistons, fixed type, Fire Red |
| Rotor diameter | 14 inch |
| Rotor construction | 2-piece, vented, slotted, drilled and zinc plated |
| Rotor thickness | 1.25 |
| Hat | Billet aluminum |
| Lug count | 5 lug |
| Bolt pattern | 5×4.75/5×5.00 |
| Axle flange | GM small pattern 10/12 bolt bearing on axle |
| Pad type | D1247 (FMSI) |
| Template | N110P |
| Minimum wheel diameter | 18 inch |
| Hose material | Stainless steel |
| Park brake | Included; park brake cables not included |
| Grade | Performance |
| Country of origin | USA |
Vehicle fitment
Before buying, confirm that your rear end’s axle flange and bolt pattern match this kit, and that your wheels are 18 inch or larger. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Park brake cables are not included, so the park brake will need your existing cables. Use template N110P to check wheel clearance before mounting. Brake work is safety critical, so have a qualified shop handle the installation and system bleed.
What’s included
- 1-piece Monoblock 6-piston 6S caliper in Fire Red
- Two 14 inch 2-piece slotted, drilled, zinc-plated rotors, pre-assembled with stainless hardware
- Backing plate with 1-piece park brake shoe assembly
- Stainless braided hoses and hardware
Not included: Park brake cables.
