Drilled kit image for BKLX050-653COSpecial order · Estimated lead time: typically 2-4 weeks
98-05 Lexus GS400 - Rear 6 Piston Big Brake Kit w/ 15 in. Drilled Rotors - Procomp
Choose year, make and model to confirm this application-specific product fits — you can add it to your cart either way.
Verify fitment- Supercomp calipers for this application
- Two-piece cross-drilled or slotted rotors
- SC5 street brake pads
- Stainless-steel braided brake lines
- Caliper mounting brackets and hardware
One approved application: 1998–2005 Lexus GS400 · JZS161
Choose an available option for each required item to enable Add to cart: Choose Caliper Color, Street or Race Pads, Center Bell Upgrades. Options marked “Contact for quote” require a KSport quote and cannot be added directly.
- Ships from Mesa, AZ
- 12-month limited warranty
- Special order: typically 2-4 weeks
Specifications — BKLX050-653CO
Product details
Most big brake kits focus on the front axle, but this one is for the rear of a 1998 to 2005 Lexus GS400 (JZS161). The title lists six-piston calipers and 15 inch drilled rotors, and the specification names the Supercomp series, so you are getting a serious rear upgrade to match a front setup you may already run.
Calipers are one-piece forged billet aluminum rather than cast or welded, giving even thickness and strength across the block. Rotors are two-piece floating discs: the outer section shifts slightly for better self-centering, which lowers drag. This part number is cross-drilled, which the page says runs cooler and suits daily driving; slotted rotors, recommended for more track use, are a separate part number.
The box contains the calipers, rotors, SC5 street pads, stainless braided lines, mounting brackets and hardware, with an owner's manual. Carbon steel brackets let the larger calipers use the OEM bracket location, and the kit works with the OEM master cylinder and ABS. Bed in the pads on a clear road with ten stops from 30 to 45 mph, a quarter mile apart. The GS430 and GS300 are also listed; verify fitment with the year, make and model checker.
Supported features
One-piece construction from a solid billet of aerospace-quality aluminum rather than cast or welded, for even thickness and strength across the caliper block.
The outer section shifts slightly as needed for better self-centering in the caliper, lowering brake drag and boosting performance through more even application.
Calipers, floating brake discs, SC5 street pads, owner's manual, and all required hardware come standard.
CNC-machined carbon steel brackets let the larger calipers bolt to the OEM caliper bracket location.
Cross-drilled rotors run cooler for daily-driven vehicles; slotted rotors are recommended for more track use.
DOT-compliant stainless braided lines stop expansion under pressure for quicker response and a firmer pedal than stock rubber lines.
Standard painted orange, red, black, and yellow; premium high-polish silver, gold, and titanium; glassy and hard-anodized finishes; over 20,000 custom colors on request.
Compatible applications (3)
Choices for this kit
Cross-drilled rotors suit daily driving; slotted rotors suit track use. Each is a separate part number.
Painted KSport orange, race red, caution yellow or jet black at no extra charge. Premium high-polish, glassy and hard-anodized finishes cost extra.
Street pads are standard; race pads, titanium or twin-colour anodized center bells are optional upgrades.
Choose the caliper finish, pads and center-bell configuration above. Every selection and any extra charge is shown before Add to Cart and saved with the order. Contact KSport for a custom color quote.
Installation
Bolt-on installation with the supplied brackets; no vehicle modification on most applications. After fitting, bed the pads in: on a clear road, ten light-to-medium stops from 30–45 mph, three seconds each, at least a quarter mile apart. Some noise before the brakes warm up is normal for big brake kits.
Brake system support and bed-in procedureWarranty & service
12-month limited warranty to the original purchaser against defects in materials and workmanship. Racing use, exterior finish and improperly installed or modified parts are not covered; keep your original invoice for any claim. Small surface cracks on cross-drilled rotors are normal wear and not a defect. Replacement pads, rotors, lines and hardware are sold individually.
Warranty terms and service requestsOther published pages for MPN BKLX050-653CO
These page names share this MPN; they do not confirm fitment. Verify your vehicle before ordering.