Overview
The Baer Brakes 4302421FR is a Fire Red Extreme Plus rear brake kit for GM 1500 trucks from 1999-2019 and GM 1500 SUVs from 2000-2020, provided the vehicle already has OE rear disc brakes and a manual park brake. Built around a 6S 6-piston monoblock caliper and a 15 inch 2-piece slotted, drilled rotor, it uses a 6×5.50 wheel bolt pattern.
Rotors arrive with NAS high grade stainless hardware pre-installed, and all brackets and hardware come with the kit, so the rear caliper, rotor and mounting pieces arrive as one set.
Key features
- 1-piece Monoblock 6-piston 6S caliper, powder coated Fire Red
- Stainless steel pistons with stainless abutments and noise suppression clips
- CNC machined from U.S.-sourced 2618 aluminum forging
- Staggered pistons designed to minimize uneven pad wear
- Dual seals for dust, weather and pressure
- 15.0 inch vented 2-piece rotor, slotted, drilled and zinc plated, with billet aluminum hat
- Brackets and hardware included with the kit
Matching wheels and tires
Wheel fit affects how a larger rotor and caliper clear the spokes and barrel. Before mounting, check the wheel’s backspacing, offset and inner barrel clearance against the caliper body and the 15.0 inch rotor, since a wheel that clears the rotor can still rub the caliper. The N228U template is the reference for this check and should be used before any tires are fitted.
Tire size changes the rolling diameter and can alter brake pedal feel slightly, so keep the tire size close to the original design. Larger wheels also add rotating mass, which makes braking harder on the pads and rotor over time. Check the wheel bearings and suspension components when changing wheel setups, because they carry the extra load.
- Check inner barrel clearance with the caliper fitted
- Confirm backspacing before ordering new wheels
- Keep tire size close to the original rolling diameter
- Recheck clearance after the first highway drive
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302421FR |
| UPC | 90127943892 |
| Sold as | Kit |
| Caliper | 6S, 1-piece Monoblock, 6-piston, floating |
| Caliper color | Fire Red |
| 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 Fire Red kit reads as follows:
- 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
The list leaves out 2500 and 3500 heavy-duty Silverado and Sierra trucks. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The kit depends on the vehicle keeping its OE rear disc brakes, factory hoses and manual park brake, so check those first. Template N228U is the reference for matching the 19 inch minimum wheel diameter.
What’s included
Included are the Fire Red 6S caliper, the 15.0 inch 2-piece rotors with stainless hardware already fitted, and all brackets and hardware.
Not included: the factory hoses and park brake, which the kit does not supply.
