Overview
The Baer Brakes 4301389GB Pro Plus is a front disc brake kit for 2WD 1/2 ton Chevrolet and GMC trucks in the listed 1960 to 1986 range. It pairs a 6-piston, 6P caliper with a 14 inch, 2-piece slotted, drilled, zinc plated rotor mounted on billet aluminum hubs, and it is built for trucks that run a 2.5 inch drop modular spindle.
The kit is built around the popular D0731 brake pad type and a 6-lug, 6×5.50 inch wheel bolt pattern. Baer Brakes assembles the billet aluminum hubs with premium bearings packed in Redline synthetic grease, and the rotors come pre-assembled with NAS high grade stainless hardware. Buyers who want a complete front disc upgrade for these trucks, rather than separate calipers and rotors, get everything bundled under one part number.
Key features
- 6-piston, 6P fixed caliper with staggered pistons to minimize uneven pad wear
- Stainless steel pistons, abutments and noise suppression clips
- Dual dust, weather and pressure seals
- 2-piece slotted, drilled, zinc plated rotor with billet aluminum hat
- CNC machined components from forged or billet aluminum with a powder coated finish
- Stainless braided hoses, DOT approved, with all mounting brackets included
- Billet aluminum hubs with premium bearings, Redline synthetic grease and billet dust caps
Matching the spindle and wheel
A front disc kit replaces the stock front brake hardware at each wheel, and the rotor, caliper and pads work together to slow the truck. On a 2WD half-ton used for hauling or light trail driving, the brakes carry more heat than stock parts, so pad material and rotor condition matter over time. Fixed six-piston calipers press the pads evenly onto the rotor, which supports consistent pedal feel when the truck is loaded.
The rotor hub and caliper bracket bolt to the spindle, so the spindle drop and bolt pattern must match the kit before the wheel goes on. Wheel offset and backspacing also change how the caliper clears the wheel, so check clearance with the actual wheel and tire before final assembly. Braided hoses should be inspected for chafing and leaks whenever the system is opened.
- Inspect rotor surfaces and thickness at each pad change
- Check caliper slide pins and pad movement after the first drives
- Re-torque wheel lugs after the first few trail runs
- Confirm pad clearance on both sides of each rotor
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301389GB |
| UPC | 90127877623 |
| Sold as | Kit |
| Axle | Front |
| Drive | 2WD |
| Caliper | 6-piston, 6P, fixed |
| Caliper color | Grabber Blue |
| Rotor type | 2-piece, slotted, drilled, zinc plated |
| Rotor construction | Vented |
| Rotor diameter | 14.0 inch |
| Rotor thickness | 1.15 |
| Hub | Billet aluminum, assembled with premium bearings |
| Brake hose | Steel braided, DOT approved |
| Pad type | D0731 (FMSI number) |
| Template | Q117P |
| Lug count | 6 lug |
| Wheel bolt pattern | 6×5.50 inch |
| Wheel stud size | 1/2-20 x 2.25 inch |
| Minimum wheel diameter | 18.0 inch |
| Spindle type | Cpp nodular iron 2.5 inch drop |
| Spindles included | No |
| Country of origin | USA |
| Grade | Performance |
Vehicle fitment
It fits these vehicles:
- Chevrolet C10, 1960 to 1986
- Chevrolet C10 Suburban, 1967 to 1986
- Chevrolet Suburban, 1960 to 1966 and 1987 to 1989
- GMC 1000 Series, 1960 to 1965, and GMC 1000, 1966
- GMC C15, 1975 to 1978
- GMC C15/C1500, 1967 to 1974
- GMC C1500, 1979 to 1986
The list does not include Chevrolet C/K pickups from 1987 onward other than the Suburban, or any later model years. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
- Spindles are not included, so the truck needs a Cpp nodular iron 2.5 inch drop modular spindle.
- Baer does not guarantee wheel fit across every wheel style. Compare the Q117P template with the wheel you plan to run. The kit is designed to fit most 18 inch or larger wheels, and the minimum wheel diameter is 18.0 inch.
- Support the truck securely on stands before removing the existing brake parts.
What’s included
The kit includes billet aluminum hubs with premium bearings, Redline synthetic grease and billet dust caps, rotors pre-assembled with NAS high grade stainless hardware, all mounting brackets, stainless braided hoses, and hardware.
Not included: Spindles. The 2.5 inch drop spindle is a separate requirement.
