Overview
The Baer Brakes SS4 Plus 4302333MG is a rear disc brake kit built for GM small pattern 10/12 bolt bearing-on-axle housing ends with a 5×4.75/5×5.00 wheel bolt pattern. A four-piston S4 caliper finished in Monster Green clamps a 13 inch two-piece slotted, drilled, zinc-plated rotor.
Baer’s backing plate serves as the caliper mount and houses a one-piece park brake shoe assembly, so the parking brake is built into the rear setup. The fixed caliper and 13 inch rotor are sized for wheels of 17 inch or larger, with a minimum wheel diameter of 17.0 Inch.
Key features
- Four-piston S4 fixed caliper built in Phoenix, Az
- Two-piece slotted and drilled rotor with a zinc-plated surface and billet aluminum hat
- Hard anodized aluminum pistons with stainless steel abutments
- Noise suppression clips included with the pads
- Dust, weather and pressure seals on the caliper
- Rotors pre-assembled with NAS high grade stainless hardware
- Vented rotor construction
Choosing a rear setup
Bearing-on-axle rear ends carry the wheel bearing on the axle shaft, so the flange and hub arrangement affect how the brake mounts. Before fitting a rear disc kit, confirm which bearing style your axle uses and whether the housing end is flush or non-flush. Brake clearance is also tied to the wheel: a larger-diameter wheel leaves more room for the caliper, but backspacing still decides whether the caliper and rotor sit clear of the spokes.
Fixed calipers hold their position in the bracket and use pistons on both sides of the rotor, which keeps pad contact even. Pads, hoses and the park brake shoe are often replaced together when a rear system is upgraded. Uneven pad wear, a soft pedal or rotor scoring are signs that the rear setup needs attention.
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302333MG |
| UPC | 90127952061 |
| Sold as | Kit |
| Caliper | S4 |
| Caliper color | Monster Green |
| Caliper type | Fixed |
| Piston quantity | 4 |
| Rotor outside diameter | 13.0 Inch |
| Rotor construction | Vented |
| Rotor type | 2-Piece |
| Surface type | Slotted, Drilled and Zinc Plated |
| Rotor thickness | 0.81 |
| Min wheel diameter | 17.0 Inch |
| Axle flange | GM Small Pattern 10/12 Bolt Bearing on Axle (Buick/Olds/Pontiac) |
| Wheel bolt pattern | 5×4.75/5×5.00 |
| Lug count | 5 Lug |
| Pad FMSI number | DR1-C |
| Template | S135H |
| Includes park brake | Yes |
| Includes park brake cables | No |
| Grade type | Performance |
| Brake hoses DOT approved | Yes |
| Country of origin | USA |
Vehicle fitment
The kit is matched to the GM Small Pattern 10/12 Bolt Bearing on Axle flange used on Buick, Olds and Pontiac applications, with a 5×4.75/5×5.00 wheel bolt pattern. Confirm fit for your vehicle’s year, model and trim before ordering, and compare the axle flange to your rear end.
Baer cannot guarantee fit with every wheel style, so use the S135H template to check your wheel. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Test-fit the S135H template against your wheel, since Baer cannot confirm clearance for every wheel style. Park brake cables are not supplied, so plan a cable source if your setup uses them. A qualified brake technician should handle the installation.
What’s included
The kit includes the S4 fixed caliper, two-piece rotors, backing plate with park brake shoe assembly, NAS high grade stainless hardware and braided brake hoses.
Not included: park brake cables.
