Overview
The Baer Brakes Extreme Plus rear brake kit, part 4302270MG in Monster Green, is a 14-inch rear disc brake system for GM small-pattern 10/12 bolt bearing-on-axle housing ends, the Buick, Olds and Pontiac flange design. It uses a 5×4.75/5×5.00 wheel bolt pattern and a non-flush mount housing end.
The caliper is a one-piece monoblock design with six pistons, model 6S, which clamps a two-piece slotted, drilled and zinc-plated rotor with a billet aluminum hat. Staggered pistons help reduce uneven pad wear, and the pad type is D1247. The minimum wheel diameter is 18.0 inch.
Key features
- One-piece monoblock fixed caliper with six pistons, finished in Monster Green.
- Staggered pistons designed to reduce uneven pad wear.
- Stainless steel pistons, abutments and noise suppression clips.
- Caliper CNC machined from US-sourced 2618 aluminum forging with a powder coated finish.
- Two-piece rotor, slotted, drilled and zinc plated, with a billet aluminum hat.
- Rotors pre-assembled with NAS high grade stainless hardware.
- Stainless braided hoses and hardware included.
- Dual dust, weather and pressure seals.
Rotor size and wheel clearance
A larger rotor changes the geometry around the hub. The rotor and caliper need enough room inside the wheel, so a wheel that clears the caliper body at one offset may not clear it at another. Measure the caliper and rotor against the wheel’s back spacing before choosing tires, and count any spacers in the stack.
Heavier loads and steep grades put more heat into the rotor than light street driving does. Pad material matters here: a pad suited to the work you do will fade less and wear more evenly. Watch for glazing, blue spots on the rotor face, and a pedal that sinks after repeated stops.
Re-torque the lug nuts after the first few drives, since new contact surfaces can settle. Keep the stainless hardware clean and free of corrosion so future service stays straightforward.
- Check wheel back spacing before choosing tires
- Look for heat checking after long downhill runs
- Replace pads when the friction material is worn down
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302270MG |
| UPC | 90127951675 |
| Sold as | Kit |
| Caliper | 6S |
| Caliper color | Monster Green |
| Caliper type | Fixed |
| Caliper piston quantity | 6 |
| Rotor outside diameter | 14.0 inch |
| Rotor construction | Vented |
| Rotor type | 2-piece |
| Rotor thickness | 1.25 |
| Surface type | Slotted, drilled and zinc plated |
| Axle | Rear |
| Axle flange | GM small pattern 10/12 bolt bearing on axle (Buick/Olds/Pontiac) |
| Housing end | Non-flush mount |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Minimum wheel diameter | 18.0 inch |
| Pad FMSI number | D1247 |
| Hose material | Stainless steel |
| Park brake | Included (park brake cables not included) |
| Template | N110P |
| Grade type | Performance |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
The kit is built around the GM small-pattern 10/12 bolt bearing-on-axle flange and a 5×4.75/5×5.00 pattern. Check the flange design and bolt pattern against your axle and hub before mounting.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The rotors arrive pre-assembled with stainless hardware, and the 14-inch rotor requires a wheel of 18 inches or larger. Use template N110P to check wheel clearance before mounting. Park brake cables are not included, so plan for them separately.
What’s included
The kit includes the 6S six-piston caliper in Monster Green, the 14-inch two-piece rotor with billet aluminum hat, the park brake shoe assembly housed in the backing plate, stainless braided hoses and stainless hardware.
Not included: park brake cables.
