Overview
The 4302421MG is an Extreme Plus rear brake kit for GM C/K1500 trucks from 1999-2019 and GM C/K1500 SUVs from 2000-2020. It includes a 1-piece Monoblock 6-piston 6S caliper and a 15 inch 2-piece slotted, drilled, zinc-plated rotor. It fits vehicles with OE rear disc brakes and a manual park brake, on a 6×5.50 wheel bolt pattern.
This version has a Monster Green caliper finish. The rotors and brackets come pre-assembled with NAS high grade stainless hardware, and the kit re-uses the vehicle’s factory rear hoses and manual park brake rather than replacing them.
Key features
- 1-piece Monoblock 6-piston caliper, model 6S, made in Phoenix, Arizona
- CNC machined from U.S.-sourced 2618 aluminum forging
- Powder coated Monster Green caliper finish
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons designed to minimize uneven pad wear
- Dual seals for dust, weather and pressure
- 15.0 inch vented 2-piece slotted, drilled, zinc-plated rotor with billet aluminum hat
Before you buy
A rear brake upgrade affects more than the caliper and rotor. The rear axle carries part of the braking load, so matching the new kit to the truck’s existing brake setup helps keep the stopping feel even front to rear. Owners who tow or carry heavy loads often find that rear braking matters more under those conditions, which makes a complete, correctly fitted kit worth the attention.
Pads are commonly replaced at the same time as rotors, since new rotors wear best against fresh friction material. Check the rear hardware, slide pins and parking brake components during installation, because worn parts left in place can cause uneven wear or noise on a newly built system.
- Confirm the rear axle has OE disc brakes before ordering
- Replace pads together with rotors
- Inspect park brake cables and adjustment after fitting
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302421MG |
| UPC | 90127943953 |
| Sold as | Kit |
| Caliper | 6S, 1-piece Monoblock, 6-piston, floating |
| Caliper color | Monster Green |
| Axle | Rear |
| Rotor outside diameter | 15.0 inch |
| Rotor construction | Vented, 2-piece, slotted, drilled, zinc plated |
| Rotor thickness | 1.25 |
| Pad FMSI | D1247 |
| Lug count | 6 lug |
| Wheel bolt pattern | 6×5.50 |
| Min wheel diameter | 19.0 inch |
| Hoses | Re-uses OE hoses |
| Park brake | Not included, re-uses OE park brake |
| Template | N228U |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
Baer’s manufacturer fitment list for this kit covers the following vehicles, all with OE rear disc brakes and a manual park brake:
- Cadillac Escalade, 2002-2020
- Cadillac Escalade ESV, 2003-2020
- Cadillac Escalade EXT, 2002-2013
- Chevrolet Avalanche, 2007-2013
- Chevrolet Avalanche 1500, 2002-2006
- Chevrolet Silverado 1500, 1999-2019
- Chevrolet Suburban, 2015-2020
- Chevrolet Suburban 1500, 2000-2014
- Chevrolet Tahoe, 2000-2020
- GMC Sierra 1500, 1999-2019
- GMC Yukon, 2000-2020
- GMC Yukon XL, 2015-2020
- GMC Yukon XL 1500, 2000-2014
Heavy-duty Silverado and Sierra 2500 and 3500 models are not on the list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The kit leaves the OE hoses and manual park brake in place, so the truck must already have OE rear disc brakes and a manual park brake. The 15.0 inch rotor requires wheels 19 inch or larger. Check clearance with the N228U template against your wheels before mounting.
What’s included
The kit includes the 6S Monoblock caliper in Monster Green, 15.0 inch 2-piece rotors pre-assembled with NAS high grade stainless hardware, and all brackets and hardware.
Not included: the OE rear hoses and manual park brake, which the kit re-uses.
