Overview
The Baer Brakes SS4 Plus 4262689CY is a rear brake kit for Ford 9 inch early big bearing axle housings, built around a 4-piston S4 caliper and an 11 inch, 2-piece slotted, drilled, zinc-plated rotor. It is sold as a complete kit in Comp Yellow for rear ends that use the Ford 9 inch early big bearing axle flange.
The kit is meant for wheels 15 inch or larger. The rotors come pre-assembled with NAS high grade stainless hardware, and the kit also includes mounting brackets and braided hoses. Wheel fit is not guaranteed for every wheel style, so use template S125A to check clearance against the wheel you plan to use.
Key features
- 4-piston S4 caliper, manufactured in Phoenix, AZ
- CNC machined from US-sourced forged or billet aluminum
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual seals for dust, weather and pressure
- 2-piece slotted, drilled, zinc-plated rotor with a billet aluminum hat
- Powder coated Comp Yellow finish
- Uses the DR1-C pad type, a popular choice for this caliper
Signs the rear brakes need service
Rear disc brakes on a Ford 9 inch axle work hardest during stops with a loaded vehicle, so the pads and rotors wear at a steady pace. Look for a pulsing pedal, a grinding or squealing noise, or a pedal that feels softer than usual. Any of these signs calls for a closer inspection of the caliper slides, pad thickness and rotor surface before the next drive.
Rotor condition matters as much as pad material. Check for scoring, heat cracks and uneven wear across the friction surface. Because the rotor and hub arrive assembled, inspect the hardware and the hub face together, and retighten fasteners after the first few drives. Brake hoses should be checked for cracks, bulges and leaks at the same time, since a soft hose can cause the same symptoms as a worn pad.
- Pulsing or vibrating pedal during braking
- Grinding or squealing noise from the rear wheels
- Visible scoring, grooves or cracks on the rotor face
- Brake fluid seepage at hose fittings or the caliper
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4262689CY |
| UPC | 90127949207 |
| Sold as | Kit |
| Axle | Rear |
| Axle flange | Ford 9 inch early big bearing |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Comp Yellow |
| Rotor outside diameter | 11.0 inch |
| Rotor thickness | 1.020 inch |
| Rotor type | 2-piece, slotted, drilled, zinc-plated |
| Rotor construction | Vented |
| Rotor hat | Billet aluminum |
| Wheel bolt pattern | 5×4.50/5×4.75 |
| Lug count | 5 |
| Minimum wheel diameter | 15.0 inch |
| Pad FMSI number | DR1-C |
| Brake hose DOT approved | Yes |
| Includes park brake | No |
| Grade | Performance |
| Template | S125A |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
The kit is built for Ford 9 inch early big bearing axle flanges on the rear axle, and it suits wheels 15 inch or larger. Template S125A is used to check wheel clearance.
Installation notes
The rotors arrive pre-assembled with NAS high grade stainless hardware, so the rotor and hub assembly is not separated for mounting. Use template S125A to confirm the wheel clears the 11 inch rotor and the S4 caliper before final assembly. Rear brake hydraulic work should be done by someone experienced with brake bleeding.
What’s included
The kit includes the S4 calipers, 11 inch 2-piece slotted, drilled, zinc-plated rotors pre-assembled with NAS high grade stainless hardware, all mounting brackets, and stainless braided hoses with hardware.
Not included: A park brake. The kit does not include one.
