Ksport

Procomp 4-Piston Rear Big Brake Kit

$2,084.78

SKU: BKSB020-433SO

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Ksport Procomp Big Brake Kit offers a significant upgrade to your Subaru Forester's braking performance, specifically for the 2003-2007 model years. This rear kit features a robust 4-piston caliper paired with a 330mm x 32mm slotted rotor, designed to enhance stopping power and reduce brake fade, especially under demanding conditions. The caliper construction utilizes one-piece billet aluminum for a lightweight yet incredibly strong design, incorporating aluminum pistons for corrosion resistance and better heat handling. The opposed-piston caliper design optimizes pad grip and ensures more even pad wear compared to OEM systems. For enhanced performance and pedal feel, the kit includes stainless steel brake lines that prevent expansion under high temperatures and pressures. The 2-piece rotor assembly, featuring an aluminum center, reduces rotational mass and improves braking response. The slotted rotor design is recommended for track use, as it effectively wicks away heat, dust, and gases from the pad surface. Ksport offers different pad compounds, including SC5 Street pads for daily driving and RC1 Race Pads for extreme track conditions. This kit comes with a 12-month warranty covering manufacturer defects. A fitment note specifies it is designed for vehicles with a 290mm OEM front rotor.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandKsport
Part NumberBKSB020-433SO
CategoryBrakes

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

View Full Shipping Policy