Overview
The Baer Brakes Extreme Plus 4302421S is a complete silver rear disc brake kit for 1999–2019 GM C/K 1500 trucks and 2000–2020 GM C/K 1500 SUVs, including Chevrolet, GMC and Cadillac models, when the vehicle already has rear disc brakes and a manual park brake. The kit centers on a one-piece monoblock 6S six-piston caliper clamping a 15-inch, two-piece slotted, drilled and zinc-plated rotor with a billet aluminum hat.
The 15-inch rotor fits wheels 19 inches or larger, and the kit uses D1247 brake pads. Rotors arrive pre-assembled with NAS high grade stainless hardware, and all brackets and hardware are included. Because wheel designs vary, check clearance against the N228U template before installation.
Key features
- One-piece monoblock 6S caliper with six pistons, manufactured in Phoenix, Arizona
- CNC-machined caliper from U.S.-sourced 2618 aluminum forging, with powder coated silver finish
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons designed to minimize uneven pad wear
- Dual seals for dust, weather and pressure
- Two-piece slotted, drilled, zinc-plated rotor with billet aluminum hat
Pad and rotor wear
Pads and rotors wear as a pair, so it helps to plan replacement together. Rotors that show scoring, a lip at the outer edge or uneven thickness should be replaced rather than resurfaced once they reach the wear limit.
Trucks used for towing or hauling run the rear brakes harder, which shortens pad life. Check the parking brake cable and adjustment after installation, since a manual park brake that drags or fails to hold will wear the pads unevenly. Bleed the system after any hose or caliper work and use the fluid type the vehicle’s system is designed for.
- Measure pad thickness at each service interval
- Inspect the park brake cable for fraying or sticking
- Clean caliper slides and apply high-temperature grease
- Torque wheel fasteners after the first few drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302421S |
| UPC | 844165049807 |
| Caliper | 6S, one-piece monoblock, 6-piston |
| Caliper color | Silver |
| Caliper type | Floating |
| Rotor outside diameter | 15.0 Inch |
| Rotor thickness | 1.25 |
| Rotor type | 2-Piece |
| Rotor material | Iron with aluminum hat |
| Surface type | Slotted, drilled and zinc plated |
| Pad FMSI number | D1247 |
| Template | N228U |
| Minimum wheel diameter | 19.0 Inch |
| Lug count | 6 Lug |
| Wheel bolt pattern | 6×5.50 |
| Grade type | Performance |
| Hose material | Re-uses OE hoses |
| Country of origin | US |
Vehicle fitment
The kit fits 2002–2020 Cadillac Escalade, 2003–2020 Cadillac Escalade ESV, 2002–2013 Cadillac Escalade EXT, 2007–2013 Chevrolet Avalanche, 2002–2006 Chevrolet Avalanche 1500, 1999–2019 Chevrolet Silverado 1500, 2015–2020 Chevrolet Suburban, 2000–2014 Chevrolet Suburban 1500, 2000–2020 Chevrolet Tahoe, 1999–2019 GMC Sierra 1500, 2000–2020 GMC Yukon, 2015–2020 GMC Yukon XL and 2000–2014 GMC Yukon XL 1500. The vehicle must have factory rear disc brakes and a manual park brake.
Not covered: heavy-duty 2500 and 3500 series trucks, which fall outside the C/K1500 applications, and any vehicle without factory rear disc brakes. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The kit reuses the vehicle’s factory hoses. Because the rotors ship pre-assembled, check hub and wheel clearance against the N228U template before fitting them. Rear brake work should be carried out by a technician who knows rear disc systems.
What’s included
The kit includes the 6S monoblock caliper, the two-piece rear rotors with billet aluminum hats, the pre-assembled NAS high grade stainless rotor hardware, and all brackets and hardware.
Not included: front rotors and lug nuts. The factory brake hoses are reused rather than supplied.
