Overview
The Baer Brakes SS4 Plus rear brake kit, part number 4302438HO, is a Hugger Orange rear disc brake kit designed for GM small pattern 10/12 bolt rear ends that use bearing-on-axle mounting and flush mount bearing housings. Its four-piston S4 caliper clamps a 13 inch, two-piece slotted and drilled zinc-plated rotor.
The backing plate both mounts the caliper and holds a one-piece park brake shoe assembly, so the parking brake is integrated into the carrier. Owners who want a rear brake upgrade in a bold caliper color, on wheels 17 inch or larger, are the intended buyers for this kit.
Key features
- Four-piston S4 caliper with hard anodized aluminum pistons and stainless steel abutments
- Slotted, drilled, zinc-plated two-piece rotor on a billet aluminum hat
- Dual seals against dust, weather and pressure
- Powder coated caliper in Hugger Orange
- Rotors come pre-assembled with NAS high grade stainless hardware
- Steel braided hoses with DOT approval
- Caliper assembled in Phoenix, Arizona, from US sourced forged or billet aluminum
Choosing pads and fluid
Pad choice matters more with a larger rotor, because the pad sets the friction level and the rotor sets the heat sink. Match the pad to the driving you do most, whether that is street work, towing or trail use, and avoid mixing compounds on the same axle. The caliper finish is cosmetic and does not change braking, so put the effort into pad and fluid quality instead.
Brake fluid absorbs moisture over time and can boil under hard use, so a fresh fill is a good habit whenever new calipers are installed. Look at the stainless hardware for seizing during service, and clean the hub face before mounting the rotor so it seats flat. Inspect hoses for bulges or chafing near the backing plate, especially on vehicles that flex over rough ground.
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302438HO |
| UPC | 90127952726 |
| Sold as | Kit |
| Caliper | S4, four-piston, fixed |
| Caliper color | Hugger Orange |
| Rotor type | 2-piece, vented, slotted, drilled, zinc plated |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Minimum wheel diameter | 17.0 inch |
| Axle flange | GM small pattern 10/12 bolt with flush mount bearing |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 lug |
| Brake pad FMSI number | DR1-C |
| Brake hose | Steel braided, DOT approved |
| Template | S135H |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
No vehicle list accompanies part number 4302438HO. The application is set by the axle: GM small pattern 10/12 bolt rear ends with flush mount bearing housings and a 5×4.75/5×5.00 hub pattern.
Axle flange and wheel bolt pattern decide fit here: GM small pattern 10/12 bolt bearing-on-axle with flush mount housings and 5×4.75/5×5.00. Verify vehicle year, model and trim against the axle before buying.
Installation notes
Because the rotors are pre-assembled with stainless hardware, the hat and rotor arrive as one unit to fit on the axle. The park brake shoe assembly is part of the backing plate, so inspect that assembly during installation. Park brake cables are not part of this kit. Run the S135H template against your wheel to confirm the caliper clears the spokes or barrel.
What’s included
Included are the Hugger Orange S4 caliper, the 13 inch two-piece rotor with billet aluminum hat, the backing plate carrying the park brake shoe assembly, and stainless braided hoses with hardware.
Not included: Park brake cables.
