Overview
The Baer Brakes 4262238MG is an SS4 rear brake kit for Ford 8 inch and 9 inch small bearing axle flanges. It pairs a fixed 4-piston S4 caliper in Monster Green with a 12 inch one-piece slotted, drilled, zinc-plated rotor and is set up for the 5×4.50/5×4.75 bolt pattern.
The backing plate acts as the caliper mount and houses a one-piece park brake shoe assembly, so the parking brake is integrated into the rear unit. The S4 caliper uses hard anodized aluminum pistons with stainless steel abutments. The 12 inch SS4 fits wheels 16 inch and up, so confirm clearance with the S113E template. The caliper is manufactured in Phoenix, AZ, and its aluminum components are CNC machined from US-sourced forged or billet stock.
Key features
- Fixed four-piston S4 caliper in a powder-coated Monster Green finish.
- Hard anodized aluminum pistons for the S4 caliper.
- Dual seals for dust, weather and pressure protection.
- One-piece slotted, drilled, zinc-plated rotor.
- Stainless steel abutments and noise suppression clips.
- Stainless braided hoses, DOT approved.
- Pad type is DR1 or HB100.
Choosing a rear disc setup
Rear disc conversions change how the parking brake works, so the setup should be planned as one system. On a rear end with a drum parking brake, the drum is removed and the park function moves to a shoe assembly sitting inside the backing plate. Because the cables route from the old drum location, they must be sourced and routed before the vehicle is driven again.
When choosing a rear disc setup, consider wheel clearance, brake fluid rated for high-temperature use, and hose length at full suspension travel. Pads should be matched to the rotor and to the driving you do; a trail-focused rig and a street-driven truck often need different compounds. Check the hoses and fittings for chafing after each install, and bleed the system fully before the first drive.
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4262238MG |
| UPC | 90127947715 |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Monster Green |
| Rotor outside diameter | 12.0 inch |
| Rotor type and construction | 1-piece, vented, slotted, drilled, zinc-plated |
| Rotor thickness | 1.02 |
| Minimum wheel diameter | 16.0 inch |
| Axle flange | Ford 8 inch/9 inch small bearing |
| Wheel bolt pattern | 5×4.50/5×4.75 (5 lug) |
| Pad FMSI number | DR1-C |
| Template | S113E |
| Park brake | Included (park brake shoe assembly); park brake cables not included |
| Brake hose | Steel braided, DOT approved |
| Piston material | Hard anodized aluminum |
| Sold as | Kit |
| Country of origin | USA |
Vehicle fitment
Fitment is set by axle rather than by a specific vehicle model. Its Ford 8 inch/9 inch small bearing axle flange and 5×4.50/5×4.75 bolt pattern are the main sizing points, so match the axle and bolt pattern before choosing it. Confirm fit for your vehicle’s year, model and trim before ordering.
Axle flanges other than the listed Ford 8 inch and 9 inch small bearing style are not covered by this kit. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The park brake cables are not included, so the one-piece park brake shoe assembly needs cables from another source. Check clearance between the 16 inch minimum wheel and the S4 caliper with the template before fitting. Brake work is safest left to a qualified installer.
What’s included
One 12 inch rotor, the S4 caliper, the backing plate with one-piece park brake shoe assembly, and stainless braided hoses.
Not included: park brake cables.
