Overview
The Baer Brakes Extreme Plus rear brake system, part number 4302270R, is a red-caliper kit for GM rear ends that use the small pattern 10/12 bolt bearing-on-axle flange with a 5×4.75 or 5×5 inch bolt circle. It is built around a 1-piece Monoblock 6-piston caliper designated 6S and a 14 inch slotted, drilled rotor, and Baer positions it for wheels that are 18 inch or larger.
Baer’s backing plate does two jobs in this kit. It serves as the caliper mount and also houses a modern 1-piece park brake shoe assembly, so the rear park brake is part of the package. The kit runs the D1247 pad type, and the caliper carries a red powder coated finish.
Key features
- One-piece Monoblock 6-piston 6S caliper with a powder coated red finish
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons designed to reduce uneven pad wear
- Dual dust, weather and pressure seals
- 2-piece slotted, drilled and zinc plated rotor with a billet aluminum hat
- Caliper CNC machined from US-sourced 2618 aluminum forging
- Rotors pre-assembled with NAS high grade stainless hardware
- Stainless braided hoses included
On the trail and in traffic
Rear brakes on a light truck or Jeep-style rig see more than road use: water crossings, mud and long descents all push the pads and rotor. A bearing-on-axle housing carries the wheel load on the axle itself, so brake work and axle condition go together. Inspect the wheel bearings and hub seals when the rear brakes are serviced.
Pad choice affects how the system behaves in those conditions. The kit runs the D1247 pad type, and pads of a different compound will change heat, noise and wear. Rotors that are scored or thin should be replaced rather than resurfaced past their minimum thickness, since a worn rotor reduces the braking surface.
- Inspect wheel bearings and hub seals
- Check pads after water and mud exposure
- Replace scored or thin rotors
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302270R |
| UPC | 844165043256 |
| Caliper | 6S, 1-piece Monoblock, 6-piston, fixed |
| Caliper color | Red |
| Rotor outside diameter | 14.0 inch |
| Rotor type | 2-piece, slotted, drilled, zinc plated |
| Rotor material | Iron with aluminum hat |
| Rotor thickness | 1.25 |
| Pad type | D1247 (FMSI) |
| Lug count | 5 lug |
| Wheel bolt pattern | 5×4.75 / 5×5.00 inch |
| Axle flange | GM small pattern 10/12 bolt, bearing on axle (Buick/Olds/Pontiac) |
| Housing ends | Non-flush mount |
| Minimum wheel diameter | 18.0 inch |
| Hose material | Stainless steel |
| Template | N110P |
| Park brake | Included |
| Country of origin | US |
Vehicle fitment
Fitment for this kit covers GM rear housings with a small pattern 10/12 bolt bearing-on-axle flange, the Buick, Olds and Pontiac family, and a 5×4.75 or 5×5 inch wheel bolt pattern. Match your housing to those dimensions, and check the N110P template against your wheel before choosing this kit.
Housings with a different flange style or bolt pattern are not covered. Confirm fit for your vehicle’s year, model and trim before ordering.
Installation notes
Park brake cables are not supplied, so plan to source them separately before you assemble the rear brakes. The rotors arrive pre-assembled with stainless hardware, and the N110P template should be used to check wheel clearance before the caliper is mounted. Brake work should be handled by a qualified installer.
What’s included
The kit includes the 6S red caliper, the rear rotors with stainless hardware, D1247 brake pads, the backing plate with its park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables and wheel lug nuts are left out of the package, and no front rotor comes with it.
