Overview
The Baer Brakes 4262255MG is a 13 inch SS4 Plus rear brake system for Ford 8 inch and 9 inch small bearing housing rear ends, with 5×4.50/5×4.75 wheel bolt patterns. A 4-piston fixed S4 caliper in Monster Green clamps a 2-piece slotted, drilled and zinc plated rotor with a billet aluminum hat, aimed at owners who want larger rear brakes for a heavier or faster build.
The rotors come pre-assembled with NAS high grade stainless hardware, which saves sorting fasteners at the bench. Baer’s backing plate acts as the caliper mount and houses a modern 1-piece park brake shoe assembly. The caliper takes the DR1-C pad, and stainless braided hoses and hardware are included.
Key features
- 4-piston S4 caliper in Monster Green, powder coated and CNC machined from US sourced forged or billet aluminum
- Hard anodized aluminum pistons with stainless steel abutments
- Dual seals for dust, weather and pressure
- 2-piece slotted, drilled, zinc plated rotor with a billet aluminum hat
- Rotors arrive pre-assembled with NAS high grade stainless hardware
- Integrated 1-piece park brake shoe assembly in the backing plate
- Stainless braided hoses and hardware included
- Fits most wheels 17 inch or larger
Choosing a rear brake upgrade
Moving to a larger rear rotor changes how the whole braking system works. More rotor diameter gives greater leverage at the same pedal effort, and it also asks more of the pads and fluid. Brake fluid can absorb moisture over time and lose boiling resistance, so a fresh fluid change is a sensible step when the rear system is upgraded. Stainless braided hoses help keep pedal feel firm as the caliper pistons move.
Pad compound should match how the vehicle is used. A softer pad bites well when cold but fades sooner under repeated stops, while a harder compound suits steady highway driving. Rear brakes are often underused on light builds, so the proportioning between front and rear should be checked after the change. Wheel clearance and the bearing or hub condition should also be confirmed before the first drive.
- Replace the brake fluid when the system is opened
- Match pad compound to terrain and weight
- Recheck pedal feel after the first short test drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4262255MG |
| UPC | 90127947586 |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Monster Green |
| Rotor outside diameter | 13.0 inch |
| Rotor type | 2-piece, slotted, drilled, zinc plated, vented |
| Rotor thickness | 0.81 |
| Rotor hardware | NAS high grade stainless, pre-assembled |
| Axle flange | Ford 8 inch/9 inch small bearing |
| Wheel bolt pattern | 5×4.50/5×4.75 |
| Lug count | 5 lug |
| Minimum wheel diameter | 17.0 inch |
| Pad FMSI number | DR1-C |
| Hose material | Steel braided, DOT approved |
| Park brake | Included |
| Template | S135H |
| Grade | Performance |
| Country of origin | USA |
Vehicle fitment
The kit is intended for Ford 8 inch and 9 inch small bearing housing rear ends with 5×4.50/5×4.75 bolt patterns. Check the axle flange and bolt pattern against your axle before choosing it. Confirm fit for your vehicle’s year, model and trim before ordering.
This kit is written for the 8 inch and 9 inch small bearing housing ends only. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Keep the pre-assembled hardware with each rotor until mounting. Because the wheel fit cannot be guaranteed for every wheel style, use the S135H template to compare the 13 inch rotor and caliper against the wheel of choice. The backing plate houses the park brake shoe, and park brake cables are not included, so plan the parking brake routing before assembly. Use jack stands; never work under a vehicle supported only by a jack.
What’s included
The kit includes the S4 caliper, the 13 inch 2-piece rotor with pre-assembled NAS stainless hardware, the backing plate with its park brake shoe assembly, and stainless braided hoses and hardware.
Not included: park brake cables.
