Overview
The silver Baer Brakes 4302270S is an Extreme Plus rear brake kit for GM small pattern 10/12 bolt bearing-on-axle housings. A 1-piece monoblock 6-piston 6S caliper clamps a 14.0 inch, 2-piece slotted, drilled and zinc plated rotor, and the kit fits 5 lug wheels on a 5×4.75/5×5.00 bolt pattern.
The rotor has a billet aluminum hat and arrives pre-assembled with NAS high grade stainless hardware. Baer’s backing plate holds a modern 1-piece park brake shoe assembly, and the caliper uses the D1247 pad type under template N110P. Stainless braided hoses and hardware are included, and the non-flush mount housing ends identify this flange style.
Key features
- 1-piece monoblock 6-piston 6S caliper, fixed type, made in Phoenix, Az
- Caliper CNC machined from U.S. sourced 2618 aluminum forging
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons designed to limit uneven pad wear
- Dual seals for dust, weather and pressure
- 2-piece slotted, drilled, zinc plated rotor with billet aluminum hat
- Backing plate with 1-piece park brake shoe assembly
- Powder coated silver finish
Caring for a monoblock caliper
A fixed monoblock caliper stays in one position, so its pistons and seals do the work of keeping the pads even against the rotor. Staggered pistons help spread pressure, but the pads still wear over time. Check pad thickness at each service and look for a rotor that has developed a lip or heavy scoring, since those conditions speed up pad wear.
Heat is the main enemy of a larger rear system. Keep the caliper and hoses clean, look for seepage at the seals, and make sure the rotor hardware stays tight. Fresh fluid helps the system hold its feel under repeated stops, and the hoses should be inspected for cracks whenever the wheels come off.
- Check pad thickness at every service
- Inspect hoses for cracks and seepage
- Keep rotor hardware torqued to specification
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302270S |
| UPC | 844165043263 |
| Product type | Rear brake system kit |
| Caliper | 6S, 1-piece monoblock, 6-piston, fixed |
| Caliper color | Silver |
| Rotor outside diameter | 14.0 inch |
| Rotor type | 2-piece, vented |
| Rotor material | Iron with aluminum hat |
| Rotor surface | Slotted, drilled and zinc plated |
| Rotor thickness | 1.25 |
| Axle flange | GM small pattern 10/12 bolt bearing on axle, non-flush mount housing ends |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Minimum wheel diameter | 18.0 inch |
| Pad FMSI number | D1247 |
| Template | N110P |
| Park brake | Included, 1-piece shoe assembly |
| Emission code | 6 |
| Grade type | Performance |
| Country of origin | US |
Vehicle fitment
The axle flange is GM small pattern 10/12 bolt bearing on axle, the Buick, Olds and Pontiac family of applications. Wheels must be at least 18.0 inch in diameter, and the N110P template should be used to check wheel fit.
C-clip axle housings are not covered by this kit. Confirm fit for your vehicle’s year, model and trim before ordering. Check housing dimensions against the flange before buying.
Installation notes
The fixed 6-piston caliper and 2-piece rotor are part of a complete rear system, so a qualified installer should handle the mounting. Park brake cables are not included and must be supplied separately. Keep the pre-assembled rotor hardware in place when fitting the rotor.
What’s included
Included are the 6S caliper, the 14.0 inch 2-piece rotor with billet aluminum hat, the backing plate with its 1-piece park brake shoe assembly, and stainless braided hoses with hardware.
Not included: park brake cables, lug nuts and a front rotor.
