Wilwood AERO4 14.00in Slotted Rear Big Brake Kit - BMW 325i/328i (E90/E92) 2006-2013 - Black

The Wilwood AERO4 rear big brake kit bolts to the OEM rear axle and reuses the factory parking brake assembly, pairing forged four-piston W4AR calipers in black powder coat with 14.00-inch GT slotted rotors to add stopping capacity behind 18-inch and larger wheels on the BMW E90 325i and 328i. The Spec-37 iron rotors run a 72-curved-vane internal design with a black electro-coat finish, and the kit ships with BP-20 compound pads, parking-brake mounting hats, and a rear stainless flexline kit. Caliper output is matched to the OE master cylinder, ABS function, and factory brake bias.

Specifications

Documents: Installation Instructions (PDF)

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy