Paragon Performance
Paragon Track Performance Big Brake Kit (PA025 4 piston) - BMW M3 (G80) / M4 (G82/G83) Rear
Paragon Track Performance Big Brake Kit (PA025 4 piston) - BMW M3 (G80) / M4 (G82/G83) Rear
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WARRANTY POLICY
WARRANTY POLICY
Warranty & Inspection Policy
All products must be carefully inspected within seven (7) calendar days of delivery.
Any claim involving damage, defects, missing parts, or incorrect items must be submitted within this seven-day inspection period. Claims made more than seven days after delivery will not be eligible for warranty coverage, replacement, return, or refund.
Customers are responsible for inspecting the product and confirming that it is correct, complete, undamaged, and suitable for the intended vehicle before installation.
Products must not be installed if any damage, defect, fitment issue, or missing component is discovered. Please contact us before proceeding with installation.
Once a product has been installed on a vehicle, it is considered accepted by the customer and is no longer eligible for warranty coverage, return, replacement, or refund.
By purchasing and installing our products, the customer acknowledges and agrees to this Warranty & Inspection Policy.
This Paragon PA025 rear big brake kit fits BMW G80 M3 / G82 M4 and pairs application-specific calipers with two-piece rotors, pads and mounting hardware. Select the listed rotor/caliper configuration and a pad compound that suits how you drive.
Kit configuration and fitment
| Vehicle application | BMW G80 M3 / G82 M4 |
|---|---|
| Axle | Rear |
| Caliper | PA025 — four pistons |
| Rotor configuration | 355x32mm Rotor; 380x32mm Rotor |
| Caliper finish | Mil-Spec Hard Coat Anodizing; ENP Electroless Nickel Plating |
| Brake pad compound | Choose the compound shown in the product selector |
This page offers the configurations stated above. Rotor size, caliper model and finish must match the ordered kit; a similar kit for the same vehicle may use different components.
Caliper and rotor design
The PA025 calipers work with Paragon two-piece iron rotors and application-specific mounting brackets. Paragon machines the caliper body from 6061-T6 aluminum with application-specific piston sizing. The fully floating rotor mounting allows the iron ring to expand through heat cycles.
Hard anodizing and ENP electroless nickel plating are the finishes offered where listed. Choose from this page’s actual configurations; the finish does not establish wheel clearance.
PA025 and PA055 use the PBP814 service pad specification. The brake kit is vehicle- and axle-specific even though these caliper families share a pad shape.
What is included
- Two PA025 calipers and two Paragon rotor assemblies for the listed axle
- A set of brake pads in the ordered compound
- Caliper mounting brackets and required mounting hardware
- Goodridge stainless steel braided brake lines
- Paragon general big brake kit installation guide (PDF)
Choose a pad compound
P2 Sport Comfort is the street-oriented choice. P3 Road & Track covers sport driving and light track duty. R5 and R7 target dedicated track/competition use and bring greater noise, dust and a higher operating-temperature requirement. Choose for the complete braking setup rather than friction rating alone.
Wheel clearance and installation
Check a wheel-fitment template for the exact rotor/caliper configuration before ordering. Wheel diameter alone does not establish barrel or spoke clearance. Include any aftermarket suspension hardware in the check, then confirm brake-line routing and component clearance during professional installation.
Manufacturer fitment references
Product FAQs
Does this kit upgrade both axles?
No. It is an axle-specific rear kit for BMW G80 M3 / G82 M4. The listed calipers, rotors, pads and hardware serve that axle.
What must I check before ordering?
Confirm the vehicle/chassis, rear axle, ordered rotor/caliper configuration and wheel clearance. Fitment should include any modified suspension components.
Does a larger wheel guarantee clearance?
No. Barrel shape, spoke design and offset matter as well as diameter. Use the template for the exact kit rather than relying on nominal wheel size.
Which replacement pads does this caliper use?
PA025/PA055 use PBP814. Match the installed caliper and choose the appropriate compound.