Overview
The Baer Brakes SS4 Plus rear brake system, part number 4262653MG, pairs a 4-piston S4 caliper with a 13 inch, 2-piece slotted, drilled, zinc plated rotor. It is designed 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 Monster Green, and the minimum wheel diameter is 17.0 inch.
The SS4 Plus carries a 2-piece rotor with a billet aluminum hat. Baer’s backing plate serves as the caliper mount and houses a 1-piece park brake shoe assembly. The rotor is pre-assembled with NAS high grade stainless hardware, and stainless braided hoses are included. The pad type is DR1-C, and the template for checking wheel clearance is S135H.
Key features
- 4-piston S4 caliper made in Phoenix, Arizona
- CNC machined from US sourced forged or billet aluminum
- Powder coated Monster Green finish
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual dust, weather and pressure seals
- 2-piece slotted, drilled, zinc plated rotor with billet aluminum hat
- NAS hardware and stainless braided hoses included
Two-piece rotor care
Two-piece rotors separate the friction ring from the hub hat. The ring can expand under heat without distorting the hat that bolts to the hub, which suits repeated hard stops. The trade-off is that the fasteners between the two parts need periodic checks, since loose hardware can cause vibration or uneven runout.
Because the rotor is heavier than a one-piece design, check wheel bearings and hub bolts during the first inspection after installation. Look at the friction surface for deep grooving, pad deposit patterns and cracks that start near slots or drilled holes. Clean the hat and mounting face before reinstalling the wheel so the rotor seats flat.
- Recheck hat-to-ring fasteners after the first trail run
- Watch for pulsation under light braking
- Keep the mounting face free of rust and debris
- Match pads to the rotor friction surface
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4262653MG |
| UPC | 90127948378 |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Monster Green |
| Rotor outside diameter | 13.0 inch |
| Rotor type | 2-piece |
| Rotor construction | Vented, slotted, drilled, zinc plated |
| Rotor hat | Billet aluminum |
| Rotor thickness | 0.81 |
| 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 | 17.0 inch |
| Pad type | DR1-C |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included |
| Park brake cables | No |
| Template | S135H |
| Emission code | 6 |
| Grade | Performance |
| Format | Kit |
| Country of origin | USA |
Vehicle fitment
The kit is built around the Ford 8 inch and 9 inch small bearing rear axle flange, which identifies an axle type rather than a model year. Check the axle flange, the 5×5.00 inch bolt pattern and the 17.0 inch minimum wheel diameter before choosing it.
Baer cannot guarantee that the kit fits every wheel style, so use template S135H to test your wheel. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The rotor hardware arrives pre-assembled, so the rotor and hat should not be separated during handling. Use template S135H against the wheel before mounting, because the 17.0 inch minimum wheel size is the limiting dimension. Park brake cables are not included, so confirm your parking brake arrangement first. A qualified technician should complete the install and test both brake systems before driving.
What’s included
The kit includes the S4 caliper, the backing plate with its park brake shoe assembly, the 13 inch 2-piece rotor with billet aluminum hat, and stainless braided hoses with NAS hardware.
Not included: park brake cables.
