Overview
The Baer Brakes 4302343CY is an SS4 rear brake system kit with a 4-piston caliper, a 12-inch 1-piece slotted, drilled and zinc plated vented rotor, and a Comp Yellow caliper finish. It is made for rear ends with the GM small pattern 10/12 bolt axle flange and a flush mount bearing housing, which is the bearing on axle (BOA) style.
The S4 caliper mounts to Baer’s backing plate, and that plate also houses a modern 1-piece park brake shoe assembly, so the parking brake is part of the same unit. The system uses the DR1 or HB100 pad type and T compliant dust and weather seals. The 12-inch SS4 fits most 16 inch or larger wheels, but check wheel clearance against the S113E template before installation.
Key features
- S4 4-piston caliper with a powder coated finish
- Caliper body CNC machined from forged or billet aluminum sourced in the US
- Hard anodized aluminum pistons with stainless steel abutments and noise suppression clips
- Dual dust, weather and pressure seals
- 12-inch 1-piece slotted, drilled and zinc plated vented rotor
- Backing plate housing a 1-piece park brake shoe assembly
- Stainless braided hoses, DOT approved
Rear brake service tips
A rear disc brake kit works as a system, so the caliper, rotor, pads and hoses should be checked together. Pads wear at different rates depending on driving style, and a rotor that has been overheated can show blue discoloration or uneven wear. Inspect the pad thickness and rotor surface at every wheel service, and look for cracks in the hoses and leaks around the caliper fittings.
On a truck or Jeep used for trail work, rear brakes see more heat from long descents and repeated stops. Rear park brakes are also used less often, so the cable and shoe adjustment should be checked during routine service. Brake work is safety critical, so have a qualified installer bleed the system and test the pedal before the vehicle is driven.
- Check pad thickness at each wheel service
- Look for scoring, cracks or heat marks on the rotor
- Inspect braided hoses for abrasion and leaks
- Test the parking brake after installation
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302343CY |
| UPC | 90127952795 |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Comp Yellow |
| Piston material | Hard anodized aluminum |
| Rotor type | 1-piece, slotted, drilled, zinc plated |
| Rotor construction | Vented |
| Rotor outside diameter | 12.0 inch |
| Rotor thickness | 1.02 |
| Minimum wheel diameter | 16.0 inch |
| Axle flange | GM small pattern 10/12 bolt with flush mount bearing |
| Lug count | 5 lug |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Pad FMSI number | DR1-C |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included; park brake cables not included |
| Grade type | Performance |
| Template | S113E |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
This is a rear brake system built for an axle with a GM small pattern 10/12 bolt flange, a flush mount bearing housing and a 5×4.75/5×5.00 wheel bolt pattern. Measure your rear end and compare it with the S113E template before ordering.
Installation notes
Park brake cables are not included, so the parking brake needs cables sourced separately. Use the S113E template to confirm clearance with your chosen wheel. Brake work is safety critical, so have a qualified installer bleed the system and test the pedal before driving.
What’s included
The kit includes the S4 4-piston caliper, the 12-inch 1-piece slotted, drilled and zinc plated rotor, the backing plate with its park brake shoe assembly, and stainless braided hoses.
Not included: Park brake cables.
