Overview
Part 4302339MG is Baer’s SS4 Plus rear brake package finished in Monster Green, built for 2WD Chevrolet C10 and GMC C10-series trucks from 1960 through 1988. It uses the large pattern 10/12 bolt C-clip housing ends and fits the 5 lug, 5×5.00 wheel bolt pattern.
The system pairs a four-piston S4 caliper with a 13 inch two-piece rotor that is slotted, drilled and zinc plated. The backing plate carries the caliper and also holds a one-piece park brake shoe assembly. Wheel fit varies, so Baer advises trying the S135H template against your wheel before mounting.
Key features
- Four-piston S4 caliper with floating-type design and dual dust, weather and pressure seals
- Hard anodized aluminum pistons paired with stainless steel abutments and noise suppression clips
- Vented 13.0 inch two-piece rotor with a billet aluminum hat
- Slotted, drilled and zinc plated rotor surface
- Rotors come pre-assembled with NAS high grade stainless hardware
- Backing plate doubles as the caliper mount and houses a modern one-piece park brake shoe assembly
- Stainless braided, DOT approved brake hoses with stainless hardware
- Powder coated finish; CNC machined from US sourced forged or billet aluminum; made in Phoenix, AZ
Rotor surface and pad wear
Drilled and slotted rotors shed water and gas from the pad face, which helps the braking surface stay consistent in wet weather. They can also show pad wear faster in some setups, so pads are worth checking more often than on a plain rotor. Pad material matters, since a harder compound can wear rotors faster than it saves them.
Inspect the rotor face for cracks radiating from the hat or heavy scoring near the edge. Light marks are normal after break-in, but deep grooves or uneven thickness across the face mean the rotor should be measured or replaced. Keep the hub face clean when reinstalling.
- Check pad thickness at every wheel service
- Listen for squeal that changes with speed
- Replace pads and rotors as a matched set when possible
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302339MG |
| UPC | 90127878729 |
| Kit type | Kit |
| Caliper | S4, four-piston, floating type |
| Caliper color | Monster Green |
| Rotor type | Two-piece, vented |
| Rotor outside diameter | 13.0 inch |
| Rotor thickness | 0.81 |
| Rotor surface | Slotted, drilled and zinc plated |
| Rotor hat | Billet aluminum |
| Pad type | DR1-C |
| Brake hose | Steel braided, DOT approved |
| Park brake | Included, one-piece shoe assembly |
| Park brake cables | Not included |
| Minimum wheel diameter | 17.0 inch |
| Lug count | 5 lug |
| Wheel bolt pattern | 5×5.00 |
| Axle | Rear |
| Drive | 2WD |
| Template | S135H |
| Emission code | 6 |
| Grade type | Performance |
| Country of origin | USA |
Vehicle fitment
It fits the following 2WD applications:
- 1960 to 1986 Chevrolet C10
- 1967 to 1986 Chevrolet C10 Suburban
- 1987 Chevrolet R10
- 1987 to 1988 Chevrolet R10 Suburban
- 1966 GMC 1000
- 1960 to 1965 GMC 1000 Series
- 1975 to 1978 GMC C15 Suburban
- 1967 to 1974 GMC C15/C1500 and C15/C1500 Suburban
- 1979 to 1986 GMC C1500 Suburban
- 1987 to 1988 GMC R1500 Suburban
- 1960 to 1966 GMC Suburban
Only 2WD applications are listed. Trucks from 1989 onward and 4WD models are outside this list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Mount the rotors with the stainless hardware they arrive with, after confirming wheel clearance with the S135H template. The five-lug, 5×5.00 pattern and the 17.0 inch minimum wheel diameter must match your hub and wheel. Have a qualified technician install and bleed the brake system, since errors directly affect stopping distance.
What’s included
The kit includes the S4 calipers, two-piece rotors with pre-assembled stainless hardware, the backing plate with park brake shoe assembly, and stainless braided hoses with hardware.
Not included: park brake cables.
