The Wilwood AERO4 Big Brake Rear Axle Kit replaces the factory rear disc brakes on the BMW E90 325i and 328i while retaining the OE parking brake assembly, pairing with a front big brake upgrade. It uses forged AERO4 four-piston calipers in a red finish, BP-10 compound pads, and oversized 14.00 in. x 1.10 in. SRP drilled and slotted rotors, all sized to work with the OE master cylinder output, ABS function, and vehicle brake bias. Braided stainless steel brake lines are included.
| Type | AERO4 rear big brake kit (retains OE parking brake) |
| Position | Rear |
| Caliper | AERO4 (W4AR) forged 4-piston, red finish |
| Rotor | 14.00 in. x 1.10 in. SRP drilled & slotted |
| Pads | BP-10 compound |
| Contents | Calipers, rotors & hats, pads, mounting brackets, braided stainless brake lines, hardware |
| Quantity | Complete rear axle kit (both sides) |
| Part Number | 140-13583-DR |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2006 | BMW | 325i | Base |
| 2007-2013 | BMW | 328i | Base |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
