Overview
The Baer Brakes SS4 Plus rear brake system, part number 4302340CY, is a rear disc brake kit for 2WD Chevrolet and GMC C10-series trucks from 1960 through 1988 that use the large pattern 10/12 bolt C-clip housing ends. It is designed for a 6 lug, 6×5.50 wheel bolt pattern and is finished in Comp Yellow.
A four-piston S4 caliper clamps a 13 inch two-piece rotor that is slotted, drilled and zinc plated. The backing plate serves as the caliper mount and houses a one-piece park brake shoe assembly, so the parking brake comes in the same package. The 13 inch SS4 Plus suits most 17 inch or larger wheels, so check clearance with the S135H template before mounting.
Key features
- Four-piston S4 caliper with hard anodized aluminum pistons and stainless steel abutments
- Two-piece 13.0 inch vented rotor with a billet aluminum hat
- Dual dust/weather and pressure seals on the caliper
- Noise suppression clips and a powder coated finish
- Rotors pre-assembled with NAS high grade stainless hardware
- Backing plate houses a modern one-piece park brake shoe assembly
- Stainless braided, DOT approved brake hoses with hardware included
- CNC machined from US sourced forged or billet aluminum, manufactured in Phoenix, AZ
Brake fluid and bleeding
Swapping rear drum brakes for a disc assembly changes how the hydraulic system behaves. Calipers draw fluid differently than wheel cylinders, so the master cylinder, proportioning hardware and brake lines all deserve a look before the truck returns to the road. Fresh fluid of the grade the system is designed for keeps moisture from building up, which matters on long descents.
Bleeding a disc system works best in a set order, starting farthest from the master cylinder, with a helper pressing the pedal. Air trapped in a caliper gives a soft pedal that can feel like a fault in the new parts. Recheck pedal feel after the first few stops and confirm the fluid level again.
- Inspect hoses for chafing where they pass the axle
- Look for leaks at every fitting after the first drive
- Replace fluid that has absorbed moisture
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302340CY |
| UPC | 90127879290 |
| Kit type | Kit |
| Caliper | S4, four-piston, floating type |
| Caliper color | Comp Yellow |
| 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 | 6 lug |
| Wheel bolt pattern | 6×5.50 |
| Axle | Rear |
| Drive | 2WD |
| Template | S135H |
| Emission code | 6 |
| Grade type | Performance |
| Country of origin | USA |
Vehicle fitment
The manufacturer fitment list covers these applications, all 2WD: 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; 1967 to 1974 GMC C15/C1500 Suburban; 1979 to 1986 GMC C1500 Suburban; 1987 to 1988 GMC R1500 Suburban; and 1960 to 1966 GMC Suburban.
Not covered: 4WD trucks and any model year outside 1960 to 1988, including 1989 and newer GM trucks. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The rotors come pre-assembled with stainless hardware. Check the 6×5.50 pattern, the 17.0 inch minimum wheel diameter and the S135H template against your wheels first. Have a qualified technician set up the park brake and bleed the hydraulic lines, because brake faults directly affect stopping.
What’s included
The kit covers the S4 calipers, two-piece rotors with stainless hardware, the backing plate with its park brake shoe assembly, and stainless braided hoses with hardware.
Not included: park brake cables.
