Overview
The Baer Brakes 4302438S is a silver SS4 Plus rear brake kit for rear ends with a GM small pattern 10/12 bolt bearing-on-axle setup and flush mount bearing housing ends. A 4-piston S4 caliper clamps a 13 inch vented, two-piece rotor, and the wheel bolt pattern is 5×4.75/5×5.00.
Rotors ship pre-assembled with NAS high grade stainless hardware. The backing plate serves as the caliper mount and houses a one-piece park brake shoe assembly. Stainless braided hoses and hardware are included, and the 13 inch rotor is sized for wheels 17 inch or larger.
Owners who want a dust- and weather-sealed rear setup with DR1-C pads and an integrated park brake will find the key details below.
Key features
- Two-piece, 4-piston S4 caliper made in Phoenix, AZ
- CNC-machined body from forged or billet aluminum
- Hard anodized aluminum pistons with stainless steel abutments
- Powder-coated finish
- T compliant dust and weather seals plus dual pressure seals
- Two-piece slotted, drilled, zinc-plated vented rotor with billet aluminum hat
- Stainless braided hoses and hardware included
Park brake setup
An integrated park brake shoe works inside the backing plate, so the cabling and adjustment matter as much as the disc itself. Route cables away from heat sources, moving suspension parts, and sharp edges before tightening anything. Confirm that lever travel feels consistent on both sides once installed. Park brakes are often neglected, but a weak or dragging shoe can affect both holding force and wheel heat.
Because the park brake shares a plate with the caliper mount, check that the backing plate stays secure during bolt-on work. Stainless hardware resists corrosion but still needs tightness checks after the first drives. Choose cables that match the layout of your chassis and handle, since mismatched lengths can leave the brake either slack or stuck on.
- Route cables clear of heat and moving parts
- Check lever travel on both sides after install
- Adjust the shoe when the park brake feels weak
- Recheck stainless hardware after early drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302438S |
| UPC | 844165049593 |
| Supplied as | Kit |
| Axle | Rear |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Silver |
| Piston material | Hard anodized aluminum |
| Abutments | Stainless steel |
| Rotor outside diameter | 13.0 Inch |
| Rotor construction | Vented, two-piece |
| Rotor surface | Slotted, drilled and zinc plated |
| Rotor thickness | 0.81 |
| Axle flange | GM small pattern 10/12 bolt with flush mount bearing |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 |
| Minimum wheel diameter | 17.0 Inch |
| Pad FMSI number | DR1-C |
| Hose | Steel braided, DOT approved |
| Includes park brake | Yes |
| Includes park brake cables | No |
| Template | S135H |
| Grade | Performance |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
The kit is built for rear ends with a GM small pattern 10/12 bolt axle flange and flush mount bearing housing. Check your axle flange and bolt pattern against the vehicle before ordering.
The 13 inch rotor suits wheels 17 inch or larger. Wheel style clearance varies, so compare template S135H with the wheel you plan to run.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Park brake cables are not included, so plan for the cabling of the integrated park brake shoe assembly before installation. The rotors arrive pre-assembled with stainless hardware. Brakes are safety equipment, so have a qualified technician install and test the system.
What’s included
Stainless braided hoses and hardware, rotors with NAS high grade stainless hardware, and the one-piece park brake shoe assembly are included with the kit.
Not included: Park brake cables.
