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Ksport BKBM115-951SO Supercomp Big Brake Kit 8-Piston Slotted Rotor Upgrade

(2009-2010 BMW 535i xDrive; 2008 BMW 535xi)

Manufacturer

Part Number

BKBM115-951SO
Sale Price

$3,511.20

Estimated ship date Saturday, November 21

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No Hassle Returns

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Fitment guaranteed

Product Details

The Ksport BKBM115-951SO Supercomp Big Brake Kit is Ksport's most extreme bolt-on brake upgrade, engineered to deliver the highest level of stopping power without requiring any vehicle modifications in most applications. The Supercomp series steps beyond the ProComp lineup with larger calipers, larger rotors, more pistons, and a standard full-floating two-piece rotor assembly for superior performance on both street and track.

SuperComp Caliper Design:

  • Differential bore, opposed-piston caliper configuration machined from a single billet of aircraft-grade aluminum — not cast or welded
  • One-piece billet construction provides uniform wall thickness throughout, eliminating weak spots that can lead to fracture, warpage, or failure
  • Weighs just over 7 lbs. each for significant unsprung weight reduction
  • Aluminum pistons with high-temperature seals rated for racetrack operating conditions
  • Stainless steel brake pad wear plates standard on every caliper
  • Machined-in bridge tube protection grooves for added durability
  • 4 brake pads per caliper for maximum pad surface area and braking force

Two-Piece Floating Rotor Assembly:

  • Standard full-floating disc assembly reduces both rotating and unsprung weight
  • Floating outer ring self-centers in the caliper to reduce brake drag and promote even pad wear
  • Floating design isolates thermal stress, preventing disc warping and braking surface cupping under extreme heat
  • Two-piece rotors commonly weigh up to 50% less than OEM rotors of equivalent size
  • Unique slot pattern expels gas and pad debris faster than conventional designs while reducing brake noise
  • Every rotor is heat treated and balanced prior to shipment
  • Available in Cross Drilled (recommended for daily-driven vehicles — runs cooler) or Slotted (recommended for frequent track use)
  • Optional Titanium Center Bell and hardware or Twin Color Anodized Center Bell upgrades available

Stainless Steel Braided Brake Lines:

  • D.O.T.-compliant stainless steel braided construction stops line expansion under pressure
  • Delivers quicker pedal response and a firmer pedal feel compared to OEM rubber lines

NAOC Ceramic Brake Pads:

  • Optimized for street and occasional track use
  • Reduce brake dust by 50% or more versus race pads
  • Operating temperature range: 194°F – 1,022°F for fast warm-up under normal driving conditions
  • Minimize rotor noise and rotor wear

CNC Caliper Brackets & Hardware:

  • Includes CNC-machined carbon steel caliper brackets that allow the oversized Supercomp calipers to bolt directly to the OEM caliper bracket location
  • No vehicle modifications required in most applications

What's Included:

  • SuperComp 8-piston billet aluminum calipers
  • Two-piece floating brake disc(s) — slotted
  • SC5 street brake pads
  • D.O.T.-compliant stainless steel braided brake lines
  • CNC carbon steel caliper brackets
  • All required installation hardware and owner's manual

All Ksport Supercomp Big Brake Kits are backed by a 12-month warranty covering manufacturer defects. Note: Ksport Big Brake Kits are built to order.

Products specifications

Fits

2009-2010 BMW 535i xDrive; 2008 BMW 535xi

Rotor Type

Floating

Rotor Outside Diameter

15 IN

Disc Brake Rotor Construction

Vented

Subject to CARB? Yes/No

No

Anti-Rattle Spring Included

Yes

Friction Material Composition

Ceramic

Surface Type

Slotted

Caliper Slides Included

Yes

Rotor Diamater (in)

15

Rotor Diamater (mm)

380

Ksport Product Category

Big Brake Kits

Position

Front

Pad Shims Included

No

Color

Orange

Caliper Piston Quantity

8

Caliper Inlet Port Diameter

M10 x 1

Rotor Width mm

32

Rotor Style

Slotted

Ksport Product Sub-Category

Supercomp Big Brake Kit

Caliper Type

8 Piston

so far, so good. Don't have the tires yet, though.

excellent

correct and timely service

Good

I received the product, but l need to return it because it does not fit my truck. I have no return information.

Shopping experience was quick and easy, I was able to find exactly what I wanted. I will definitely be using this site again in the future

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