Overview
The Baer Brakes Extreme Plus front brake system, part number 4301525FR in Fire Red, is a complete front disc brake kit for GM 1500 full-size trucks and SUVs. Its 6S caliper is a 1-piece Monoblock design with six pistons, and it clamps a 15.0 Inch vented rotor. It fits 1999–2023 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks, along with Tahoe, Yukon, Suburban, Escalade and Avalanche models in the year ranges covered under Vehicle fitment.
Baer machines the caliper body from U.S.-sourced 2618 aluminum forgings in Phoenix, Arizona, and finishes it with a powder coat. Stainless steel pistons, abutments and noise suppression clips are used, and the pistons are staggered to minimize uneven pad wear. The kit takes the common D1247 FMSI pad type.
Key features
- One-piece Monoblock caliper with six pistons, designated 6S
- Powder-coated caliper in Fire Red
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons to minimize uneven pad wear
- Dual dust/weather and pressure seals
- 2-piece slotted, drilled, zinc-plated rotor with a billet aluminum hat
- Rotors pre-assembled with NAS high grade stainless hardware
Wheel clearance and wear
Wheel clearance is the first thing to settle with a larger front brake upgrade. A six-piston caliper and a bigger rotor take up more room behind the spokes than the stock setup, so the wheel’s backspacing, offset and spoke pattern all matter. Measure the inside of the wheel against the caliper body before committing to a tire size, and keep in mind that a larger tire can change rubbing clearance at full steering lock.
Pads and rotors wear together, so inspect both at each service interval. Look for uneven pad thickness, deep grooves, blue discoloration or a pulsing pedal, which can point to rotor runout or uneven pad wear. New pads should be bedded in gradually before any heavy braking.
- Check caliper clearance inside the wheel before buying tires
- Replace pads and rotors as a matched set when wear is uneven
- Re-check lug nut torque after the first few drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301525FR |
| UPC | 90127939130 |
| Caliper | 6S, 1-piece Monoblock, 6 pistons, fixed |
| Caliper color | Fire Red |
| Axle | Front |
| Rotor outside diameter | 15.0 Inch |
| Rotor thickness | 1.25 |
| Rotor type | 2-Piece, vented, slotted, drilled, zinc plated |
| Pad FMSI number | D1247 |
| Template | N077U |
| Lug count | 6 Lug |
| Wheel bolt pattern | 6×5.50 |
| Minimum wheel diameter | 19.0 Inch |
| Hose material | Re-uses OE hoses |
| Grade | Performance |
| Emission code | 6 |
| Sold as | Kit |
| Country of origin | USA |
Vehicle fitment
This kit fits 2002–2023 Cadillac Escalade, 2003–2023 Cadillac Escalade ESV, 2002–2013 Cadillac Escalade EXT, 2007–2013 Chevrolet Avalanche, 2002–2006 Chevrolet Avalanche 1500, 1999–2023 Chevrolet Silverado 1500, 2015–2023 Chevrolet Suburban, 2000–2014 Chevrolet Suburban 1500, 2000–2023 Chevrolet Tahoe, 1999–2023 GMC Sierra 1500, 2000–2023 GMC Yukon, 2015–2023 GMC Yukon XL and 2000–2014 GMC Yukon XL 1500.
Model years outside these ranges, and models not named above, are not covered by this list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The rotors come pre-assembled with stainless hardware, and the mounting brackets and hardware are included, so no separate bracket kit is needed. The factory brake hoses are re-used. Because the minimum wheel diameter is 19.0 Inch, compare the N077U template against the wheel you plan to run, since Baer cannot guarantee wheel fit. Brake work is safety-critical, so have a qualified technician install and test the system.
What’s included
Front brake kit with the 6S Monoblock caliper in Fire Red, 15.0 Inch 2-piece rotors pre-assembled with stainless hardware, and all mounting brackets and hardware.
Not included: wheels. The factory brake hoses are re-used rather than supplied.
