Overview
The Baer Brakes Pro Plus rear brake system, part number 4302531B, is a black rear disc kit for Art Morrison IRS applications. Its six-piston fixed caliper works with a 14.36 inch vented rotor, and the package includes brackets, stainless braided hoses and hardware. Confirm the rear setup before ordering.
The rotor is pre-assembled with stainless hardware and has a minimum wheel diameter of 18.0 inch. The template for this kit is Q020Q, so compare it with the wheel you intend to run, since wheel designs differ by brand. The kit is made in Phoenix, Arizona, and carries a performance grade.
Key features
- Black powder coated finish on the six-piston fixed caliper
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons help even out pad wear
- Dual seals for dust, weather and pressure
- Two-piece zinc-plated rotor, slotted and drilled, with billet aluminum hat
- Components machined from forged or billet aluminum sourced in the US
- DOT approved steel braided hoses
Choosing an IRS rear brake setup
Independent rear suspension setups carry the brake rotor on a hub or stub axle rather than a solid axle housing, so the caliper bracket must line up with the knuckle and the rotor must sit square to the hub face. Before fitting a rear disc kit, check the hub bearings, bolt pattern and axle seals for play or leaks. Brake loads go into the suspension links, so confirm the mounting points are solid and the fasteners are the correct grade for the job.
The parking brake on this kit re-uses original equipment, so its function depends on the existing hardware. Inspect those parking brake components for wear, corrosion and free movement during installation, and replace any worn pieces rather than returning them to service. Keep a spare set of pads on hand, since pads and rotors are the wear items you will check most often on any rear disc setup.
- Check hub bearings and axle seals for play or leaks
- Confirm bracket alignment with the knuckle before torquing
- Bleed the hydraulic lines after installing new hoses
- Inspect re-used parking brake parts for wear
- Re-check fasteners after the first few drives
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302531B |
| UPC | 844165047490 |
| Caliper | 6P, six pistons, fixed |
| Caliper color | Black |
| Rotor outside diameter (rear) | 14.36 inch |
| Rotor thickness | 1.1 |
| Rotor type | 2-piece, slotted, drilled, zinc plated, vented |
| Minimum wheel diameter | 18.0 inch |
| Brake pad FMSI number | D0731 |
| Template | Q020Q |
| Hose material | Steel braided |
| Hose DOT approved | Yes |
| Park brake included | No, re-uses original equipment |
| Axle | Rear |
| Lug count | 5 lug |
| Wheel bolt pattern | 5x120mm |
| Grade type | Performance |
| Emission code | 6 |
| Country of origin | USA |
Vehicle fitment
The only application is the Art Morrison IRS rear end, with no model year or chassis code attached. Compare your rear setup with the 5x120mm bolt pattern and 18.0 inch minimum wheel diameter before ordering.
Compare the 5x120mm bolt pattern and the 18.0 inch minimum wheel diameter with your hub and wheel. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
No separate brackets are needed, because the brackets are part of the kit. The parking brake depends on original equipment components that are re-used, so inspect those parts during installation and keep them in service.
What’s included
Black six-piston fixed caliper, 14.36 inch vented two-piece rotor with stainless hardware, brackets, stainless braided hoses and hardware.
Not included: park brake shoe assembly, which is re-used from the original equipment.
