Overview
The Baer Brakes Pro Plus rear brake system, part number 4302531S, is a silver rear disc kit for Art Morrison IRS applications. Its six-piston fixed caliper clamps a 14.36 inch vented rotor, and the package comes with brackets, stainless braided hoses and hardware. The only application named is Art Morrison IRS, with no model year or chassis code given, so match the rear end before ordering.
Each rotor arrives pre-assembled with high grade NAS stainless hardware. Baer’s template for this kit is Q020Q, and the company asks owners to compare that template with the wheel they plan to run, since wheel designs differ widely between brands. The unit is manufactured in Phoenix, AZ, and is listed at a performance grade.
Key features
- Silver powder coated six-piston fixed caliper
- Stainless steel pistons, abutments and noise suppression clips
- Staggered pistons aim to even out pad wear
- Dual seals for dust, weather and pressure
- Two-piece slotted and drilled zinc-plated rotor with billet aluminum hat
- Components CNC machined from forged or billet aluminum
- Steel braided hoses with DOT approval
Before you install
Independent rear suspensions put more demands on brakes than a solid axle, because the unsprung weight and wheel travel change how the caliper and rotor move. Before installing a fixed caliper kit, check that the brackets sit square to the rotor and that the caliper clears the suspension links through full travel. A slight misalignment can cause uneven pad wear or a rubbing sound that is easy to miss at first.
Because the parking brake here is the original equipment unit, its condition matters more than usual. Inspect the shoes, drum surface and adjuster before reassembly, and replace any worn parts that are not part of the new kit. Keep the brake fluid clean and fresh during the swap, since a contaminated system reduces stopping power at every corner.
- Confirm bracket alignment against the rotor face
- Check clearance through full suspension travel
- Inspect the re-used parking brake components
- Use fresh brake fluid after the system is bled
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4302531S |
| UPC | 844165048831 |
| Caliper | 6P, six pistons, fixed |
| Caliper color | Silver |
| 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 application is the Art Morrison IRS rear suspension. Match the rear end to the 5x120mm bolt pattern and the 18.0 inch minimum wheel diameter before ordering.
Match the 5x120mm bolt pattern and the 18.0 inch minimum wheel diameter to your setup. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Brackets are supplied, so no separate brackets are needed for the caliper. Because the original equipment park brake is re-used, keep your factory parking brake components in service and inspect them during installation.
What’s included
Silver six-piston fixed caliper, 14.36 inch vented two-piece rotor pre-assembled with NAS stainless hardware, brackets, stainless braided hoses and hardware.
Not included: park brake shoe assembly, which is re-used from the original equipment.
