Overview
The Baer Brakes 4302421GB is a Grabber Blue Extreme Plus rear brake kit for GM C/K1500 trucks and SUVs fitted with OE rear disc brakes and a manual park brake. Its 6-piston 6S monoblock caliper clamps a 15 inch 2-piece slotted, drilled, zinc-plated rotor, and the wheel bolt pattern is 6×5.50.
Every rotor and bracket comes pre-assembled with NAS high grade stainless hardware. The kit includes stainless steel pistons and noise suppression clips, and the staggered piston layout is designed to limit uneven pad wear.
Key features
- 6-piston 1-piece monoblock 6S caliper, manufactured in Phoenix, Arizona
- Powder coated Grabber Blue caliper finish
- Machined from U.S.-sourced 2618 aluminum forging
- Staggered pistons to minimize uneven pad wear
- Dual seals rated for dust, weather and pressure
- 15.0 inch slotted, drilled, zinc-plated 2-piece rotor with billet aluminum hat
- Brackets and all hardware included
Choosing the right setup
Rear disc upgrades work best when the caliper, rotor and pads are chosen as a matched set. Pad compound should suit the way the truck is driven, whether that means daily commuting, towing or occasional off-road use. Heavier loads and frequent stops generate more heat, which is a reason to keep the pads and rotors in good condition.
Regular inspection keeps the system predictable. Check the rotor surface for grooves or heat marks, look at the pad thickness, and make sure the caliper slides freely on its pins. Parking brake function should be tested after installation, since the manual park brake is reused from the vehicle.
- Match pad compound to typical driving
- Check caliper slide pins during service
- Test the manual park brake after fitting
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302421GB |
| UPC | 90127943915 |
| Sold as | Kit |
| Caliper | 6S, 1-piece Monoblock, 6-piston, floating |
| Caliper color | Grabber Blue |
| 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
The following entries come from Baer’s manufacturer fitment list, each 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
No Silverado or Sierra 2500 or 3500 heavy-duty models appear in this list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The kit leaves the vehicle’s OE hoses and manual park brake in place, so both must be present and in working order before installation. The kit is designed for 19 inch or larger wheels. Check wheel clearance with template N228U before mounting.
What’s included
The package has the Grabber Blue 6S caliper, the 15.0 inch rotors with pre-assembled NAS hardware, and every bracket and hardware item.
Not included: the vehicle’s own hoses and manual park brake.
