Overview
The Baer Brakes SS4 rear brake kit, part number 4302332R, is a red-caliper four-piston disc brake system for GM small pattern 10/12 bolt bearing-on-axle rear ends with 5×4.75 and 5×5 inch bolt circles. It pairs a fixed S4 caliper with a 12-inch slotted, drilled, zinc plated rotor and a park brake shoe built into the backing plate.
The 12-inch SS4 is sized for wheels 16 inches and up. Wheel fit varies by style, so check the S113E template against the intended wheel before mounting.
Key features
- S4 four-piston caliper with hard anodized aluminum pistons and stainless steel abutments
- Dual seals for dust, weather and pressure
- One-piece slotted, drilled, zinc plated 12.0 inch rotor
- Backing plate doubles as caliper mount and holds the one-piece park brake shoe assembly
- Braided brake hoses, DOT approved
- Red powder coated finish; housing machined from forged or billet aluminum
- Pad FMSI number DR1-C
Park brake and wheel clearance
Rear disc kits with a park brake shoe inside the backing plate need a different service routine than front-only setups. Lining wear and adjuster function both affect how the parking brake holds, so check them whenever the rear brakes are opened. Keep cable routing clear of heat sources and moving suspension parts.
Wheel clearance deserves the same attention. A caliper that sits close to the spokes can contact the wheel after tire growth or a change in offset. Mount the wheel, rotate it slowly by hand, and look for rub before road use.
- Check parking brake lining wear
- Adjust the parking brake after cable changes
- Look for rub marks on wheel spokes
- Inspect caliper boots and seals
- Use fresh lug nuts whenever wheels come off
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302332R |
| UPC | 844165028703 |
| Caliper | S4, 4-piston, fixed |
| Caliper color | Red |
| Rotor outside diameter | 12.0 inch |
| Rotor thickness | 1.02 |
| Rotor type and surface | 1-piece, vented, slotted, drilled, zinc plated |
| Rotor material | Iron |
| Axle flange | GM small pattern 10/12 bolt, bearing on axle (Buick/Olds/Pontiac) |
| Wheel bolt pattern | 5×4.75 / 5×5.00 inch |
| Lug count | 5 lug |
| Minimum wheel diameter | 16.0 inch |
| Pad FMSI number | DR1-C |
| Hose material | Steel braided, DOT approved |
| Park brake | Included |
| Park brake cables | Not included |
| Emission code | 6 |
| Template | S113E |
| Country of origin | US |
Vehicle fitment
This kit has no vehicle years, makes, models or trims attached to it. The axle flange is GM small pattern 10/12 bolt, bearing on axle, which Baer associates with Buick, Olds and Pontiac rear ends. Compare your housing flange and bolt pattern before ordering.
Baer cannot guarantee fit with every wheel style, so verify against the S113E template. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The park brake shoe assembly is part of the backing plate, but park brake cables are not included, so existing or separately sourced cables will need to work with it. Lug nuts and the front rotor are not part of this kit either. Bearing-on-axle work is best handled by a shop familiar with GM rear axles.
What’s included
Per the kit contents: red S4 rear caliper with backing plate and park brake shoe assembly, 12.0 inch rotor, and braided brake hoses.
Not included: park brake cables, lug nuts, front rotor.
