Overview
The Baer Brakes 4301622S is a front Extreme Plus disc brake kit in Silver for Chevrolet and GMC 1/2 ton trucks, Blazer and Suburban models, from 1971 to 1987. It is designed for trucks that already have OE front disc brake axles and knuckles, and it centers on a 6S, 6-piston caliper on a 15 inch, 2-piece slotted, drilled, zinc plated rotor.
Upgrading front brakes on these older GM trucks means matching the caliper, rotor and bolt pattern to the axle. This kit supplies the caliper, the rotor assemblies and all mounting brackets and hardware. Its 6×5.50 bolt pattern and 6 lug count are specific to these models.
Key features
- 1-piece Monoblock, 6-piston, 6S caliper manufactured in Phoenix, AZ
- Caliper body CNC machined from a US-sourced 2618 aluminum forging
- Powder coated Silver finish
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons help even out pad wear
- Dual seals for dust, weather and pressure
- 2-piece slotted, drilled, zinc plated rotor with a billet aluminum hat
- Rotors arrive with NAS high grade stainless hardware already fitted
Before you buy
Kits like this one are chosen mainly for the caliper and rotor they bring, but the axle and knuckles decide whether the setup goes together cleanly. Look over the spindle, hub face and existing brake hardware before ordering so there are no surprises during the install. Older GM front ends often show wear in the ball joints and wheel bearings, and those are much easier to address while the hub is apart.
Wheel choice matters as much as the brake hardware. A 15 inch rotor leaves less room than a larger one, so wheel offset and spoke design should be checked against the caliper body before tires are mounted. Match the lug count and bolt pattern exactly to the truck.
Brake fluid, pads and rotor condition are the usual items to inspect on a truck that has sat for years. Old fluid absorbs moisture, and dried seals can weep. Replace the fluid across the whole system rather than topping it off.
- Confirm the spindle and hub face are in good condition
- Check wheel clearance against the caliper body
- Inspect ball joints and wheel bearings while the hub is apart
- Replace old brake fluid during the install
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301622S |
| UPC | 90127854082 |
| Sold as | Kit |
| Axle | Front |
| Caliper | 6S, 1-piece Monoblock, 6-piston, fixed |
| Caliper color | Silver |
| Rotor outside diameter | 15.0 inch |
| Rotor construction | Vented, 2-piece, slotted, drilled, zinc plated |
| Rotor thickness | 1.25 |
| Min wheel diameter | 19.0 inch |
| Brake pad FMSI number | D1247 |
| Template | N085U |
| Lug count | 6 lug |
| Wheel bolt pattern | 6×5.50 |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
Manufacturer fitment lists 1971 to 1986 Chevrolet K10 and GMC K15/K1500 trucks, the Suburban versions of those trucks, 1975 to 1986 Chevrolet K5 Blazer, 1987 Chevrolet Blazer, 1975 to 1987 GMC Jimmy, 1987 Chevrolet V10 and V10 Suburban, and the 1987 GMC V1500.
The application range ends in 1987, so 1988 and newer GM C/K trucks are outside it; the V10 Suburban is the only entry that runs into 1988. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The kit is built for trucks that already have OE front disc brake axles and knuckles, so confirm that setup on the truck before ordering. The 15 inch rotor fits wheels 19 inch or larger, and template N085U is used to compare clearance against the wheel you plan to run.
What’s included
The kit includes the 6S Silver caliper, the 15 inch rotors with pre-assembled NAS high grade stainless hardware, and all mounting brackets and hardware.
Not included: OE front disc brake axle and knuckles, which the kit is built to work with.
