Overview
The Baer Brakes SS4 rear brake system, part number 4262654CY, is a rear disc brake kit built around a 4-piston S4 caliper mounted to a 12 inch, 1-piece slotted, drilled, zinc plated rotor. It is made for rear ends with the Ford 8 inch and 9 inch small bearing axle flange and a 5×5.00 inch wheel bolt pattern. The caliper is finished in Comp Yellow, and the minimum wheel diameter is 16.0 inch.
The backing plate serves as the caliper mount and houses a 1-piece park brake shoe assembly, so the parking brake hardware sits inside the same rear brake package. Stainless braided brake hoses come with the kit. This is a performance-grade rear brake upgrade. Pad options are DR1 or HB100, with FMSI number DR1-C.
Key features
- 4-piston S4 caliper manufactured in Phoenix, Arizona
- CNC machined from US sourced forged or billet aluminum
- Powder coated Comp Yellow finish
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual dust, weather and pressure seals, described by Baer as T compliant
- 12 inch 1-piece slotted, drilled, zinc plated rotor
- Stainless braided hoses, DOT approved
Parking brake considerations
A rear disc brake upgrade affects more than the rotor and caliper. The parking brake shoes sit close to the hub and backing plate, so any change in rotor fit or hub position can alter how the shoes sit and how the lever feels. Check the hub face, the rotor fit and the park brake adjustment before the wheel goes back on.
Stainless braided hoses hold their shape better under pedal pressure than standard rubber lines, which helps the pedal feel firm across repeated stops. When the system is opened, inspect the caliper seals for fluid seepage, look for chafing where hoses pass near the axle housing, and replace any hose showing cracks or bulges.
- Measure the axle flange before ordering
- Look for cracks around rotor slots and holes
- Replace pads in matched sets
- Bleed the system after any hose or caliper work
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4262654CY |
| UPC | 90127948422 |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Comp Yellow |
| Rotor outside diameter | 12.0 inch |
| Rotor type | 1-piece |
| Rotor construction | Vented, slotted, drilled, zinc plated |
| Rotor thickness | 1.02 |
| Axle | Rear |
| Axle flange | Ford 8 inch/9 inch small bearing |
| Lug count | 5 lug |
| Wheel bolt pattern | 5×5.00 inch |
| Minimum wheel diameter | 16.0 inch |
| Pad type | DR1 or HB100 |
| FMSI pad number | DR1-C |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included |
| Park brake cables | No |
| Template | S113E |
| Emission code | 6 |
| Grade | Performance |
| Format | Kit |
| Country of origin | USA |
Vehicle fitment
The kit is built for the Ford 8 inch and 9 inch small bearing rear axle flange, an axle type rather than a model year. Match the axle flange, the 5×5.00 inch bolt pattern and the 16.0 inch minimum wheel diameter against your rear end and wheels.
Use template S113E to compare the kit with your intended wheel, since not every wheel style will clear the caliper and rotor. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The backing plate carries both the caliper and the park brake shoe assembly, so confirm the park brake layout on your axle before starting. Park brake cables are not included. Rear brake work should be carried out by a qualified technician, who should also test the pedal and parking brake before the vehicle is driven.
What’s included
The kit includes the S4 caliper, the backing plate with its park brake shoe assembly, the 12 inch 1-piece rotor and stainless braided hoses.
Not included: park brake cables.
