Overview
The Baer Brakes 4302504B is a black Pro Plus rear disc brake system for 1960-1986 Chevrolet C10 and GMC C15 trucks. It pairs a 6-piston caliper with a 14-inch slotted and drilled rotor on a six-lug, 6×5.50 hub, and the system is designed for 2WD trucks.
The backing plate carries the caliper and a one-piece park brake shoe assembly, so the parking brake sits within the same unit. Rotors arrive with NAS high-grade stainless hardware already fitted. The 14-inch rotor suits most wheels 18 inches or larger. Wheel style can still affect clearance, so test the wheel against the Q135P template before mounting.
Key features
- Two-piece 6P caliper with six pistons, made in Phoenix, Arizona
- Aluminum caliper and backing plate machined from US-sourced billet or forged stock
- Black powder-coat finish
- Stainless steel pistons paired with stainless abutments and noise-suppression clips
- Pistons staggered for more even pad wear
- Dual seals resist dust, weather and pressure
- Slotted, drilled, zinc-plated two-piece rotor on a billet aluminum hat
- DOT-approved braided hoses included
Pad wear and rotor checks
Brake pads and rotors wear together, and a disc system like this one is easiest to maintain when both are inspected at the same time. Look at the rotor face for deep grooves, heat cracks or a surface that has become uneven, since any of these can make the pedal feel soft or pulsing. Slotted and drilled rotors shed water and gas more easily, but the slots still collect pad dust and need periodic cleaning. Check the caliper slides and boots for leaks or stiffness whenever the wheels come off.
Stainless hardware on the rotors should be checked for tightness after the first few drives and then at regular service intervals. Keep the backing plate free of road grime so the park brake shoe assembly adjusts and releases normally. Braided hoses can crack or bulge with age, so inspect them for chafing near the frame and the caliper fittings. Bleed the system after any hose change and test the pedal before driving in traffic.
- Replace pads once the friction material is worn close to the backing
- Inspect braided hoses for bulges or abrasion
- Recheck wheel clearance after changing tires
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302504B |
| UPC | 844165053361 |
| Caliper | 6-piston (6P), floating |
| Caliper color | Black |
| Rotor outside diameter (rear) | 14.0 inch |
| Rotor thickness | 1.15 |
| Rotor type | 2-piece, slotted, drilled, zinc plated, vented |
| Lug count | 6 lug |
| Wheel bolt pattern | 6×5.50 |
| Minimum wheel diameter | 18.0 inch |
| Brake pad FMSI number | D0731 |
| Template | Q135P |
| Axle | Rear |
| Park brake | Included; park brake cables not included |
| Brake hose | DOT approved |
| Grade | Performance |
| Country of origin | USA |
Vehicle fitment
It fits 1960-1986 Chevrolet C10 and 1967-1986 C10 Suburban, 1987 Chevrolet R10 and 1987-1988 R10 Suburban, 1966 and 1960-1965 GMC 1000 models, 1975-1978 GMC C15 Suburban, 1967-1974 GMC C15/C1500 in standard and Suburban bodies, 1979-1986 GMC C1500 Suburban, 1987-1988 GMC R1500 Suburban, and 1960-1966 GMC Suburban.
1987 Chevrolet C10 pickups and non-Suburban GMC pickups from 1979 to 1988 are absent from the list, so check those models carefully. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Stainless hardware is pre-assembled on the rotors. Check wheel clearance with the Q135P template before mounting. The park brake shoe assembly is part of the backing plate, but cables must be supplied separately. Brake components demand careful, correct installation, so have a qualified technician complete the job.
What’s included
The kit includes the six-piston caliper assembly, the backing plate with its one-piece park brake shoe assembly, two-piece rotors pre-assembled with stainless hardware, and braided brake hoses with hardware.
Not included: park brake cables.
