Rear 12.88in 4 Piston Big Brake Kit for the GEN 2 Lexus GS300/400/430 with parking brake.
This kit includes everything (except brake fluid, Teflon tape and tools) to make this a bolt on kit.
This is our Lexus Gen2 GS300/400/430 Rear 4 Piston 13 inch Wilwood brake kit with parking brake.
This kit includes the following:
-2 Wilwood, FSLI calipers in Black.
-2 Wilwood, 12.88" dia, 1.25" thick, Spec 37 Rotors, (directional, curved vane) Black E-coated. (Wilwoods special Mil-Spec finish they do exclusively for Arizona Performance on all of our rotors).
-1 Set of (4 pads) BP-10's. (others available, see options a checkout)
-2 Steel Zinc Plated Caliper brackets.
-2 Rotor hats, (billet aluminum black anodized rotor hats with blind tapped holes to resist corrosion), all fasteners installed and torqued.
-4 7/16-20 Zinc Plated Grade 8 SHCS (Caliper Bolts)
-8 7/16" Flat Washers (Caliper and Bracket)
-4 7/16" Lock Washers (Caliper)
-4 M12x1.25 Zinc Plated Grade 10.9 SHCS (Caliper Bracket)
-4 M12x1.25 Bright Zinc Grade 10.9 Hex Nuts (Caliper Bracket)
-4 M12 Lock Washers Bright Zinc Plated (Caliper Bracket)
-4 7/16 Thin Shim Washers, Zinc Plated (Caliper or Bracket), optional at installation, see instructions.
-36 1/4"-20 Grade 8, Zinc Plated SHCS (Rotor Bolts)
-24 1/4" Lock Washers Bright Zinc Plated (Rotor Bolts and Drum Rings)
-12 1/4" High Collar Lock Washers (Drum Rings)
-2 Brake line assemblies, (see details below)
The only thing you will need to complete the install on this kit is, Brake fluid, Teflon tape, and Tools.
Our kits are the product of years of racing experience. We selected the best bang for the buck when it comes to the Caliper and the Rotors, and have sourced, made or plated the very best for all of our other components. We have paid close attention to every detail to ensure they fit perfectly. We've received numerous calls from shops commenting on the quality and ease of installation.
CALIPERS: We selected Wilwood's time proven FSLI calipers, these calipers have enjoyed almost two decades of refinement, in the Superlight family. FSLI stands for Forged SuperLight Internal.
"FORGED" Each body is stress-flow forged from premium grade aluminum alloy billets. Stress-flow forging re-aligns the metal's internal grain structure to flow within the contour of the caliper body. This process eliminates the stresses and interruptions to the internal grain structure that occur when machining a straight block of forged billet material. Simply stated, there is no better way to build a stronger aluminum caliper body, including the monoblock design. See our FAQ.
"SUPERLIGHT" The Superlight family enjoys a spotlight in the racing community like no other caliper in the world. This caliper size is so popular, more than 4 different companies make pads that fit this caliper. You could almost say it has become an industry standard, as the early racers and many of the classes that provide stepping stones to racing NASCAR have all used this caliper in one variant or another.
"INTERNAL" Short for, Internally Drilled Transfer Port. The earlier designs of this caliper used an external hard "brake line" (if you will) to supply brake fluid/pressure to the outboard pistons (commonly called a transfer tube). This forced the previous versions of this caliper to be a specific left or right caliper. By using an internally drilled port transfer port, and using the original location for that port to install another set of bleeders, Wilwood was able to make this a "Left/Right Identical" part and decrease part numbers, build complexity, and cost. Owing its roots to a rich heritage in racing this caliper has enjoyed a long history of bringing quality, value, features and ultimately performance to its customers. We believe this caliper is honestly the very best value of any entry-level high performance racing brake caliper offered by any other manufacturer in the aftermarket automotive racing industry. Based on its location in our lineup, don't let the price fool you, 90% of our customers that campaign a dedicated race vehicle run our 4 piston FSLI lineup. 4 Piston FSLI calipers are several steps above the TT Supra adaptation on a MKIII. If you will notice, our rear brakes are bigger than the MKIV TT fronts, and several pounds lighter, further reducing un-sprung weight.
ROTORS: High performance braking is all about thermal mass. The greater the thermal mass, the better your brakes will work with respect to the rotors. We use Wilwood's race proven Spec 37 long grain proprietary alloy, cast iron rotors. Spec 37 rotors enjoy a superior thermal stability and have outperformed all other rotor brands with the longest wear and truest running. These are truly the finest and best performing racing rotors ever built. Do not confuse these with factory replacement or drilled and slotted rotors that are substandard aftermarket castings cast made of who-knows-what kind of material. Any factory sized replacement rotor will heat soak just as fast or faster (if its drilled) and boil the brake fluid when used at high speeds. Look for our FAQ for more details on why aftermarket replacement rotors don't work for racing.
Drum Rings: We have designed our rear rotor to work with your existing parking brake shoes. The Drum Ring is steel, and replaceable and can be turned if needed but you will need to call us for specific instructions, as the fasteners are permanently installed, and will damage the drum ring if our dis-assembly instructions are not followed. But since the Drums are specifically designed to keep the vehicle stopped, (not stopping the car while moving). I know some of us are guilty of grabbing the parking when we pass an LEO at a few MPH over the posted speed. Earlier versions are subject to Drum Ring fastener failures, but we have redesigned the interface between the Drum Ring, and the Rotor hat to keep the shear load off of the fasteners.
PADS: We sell Wilwoods BP-10 compound pads standard with all of our kits. Other pads are available from us, just look for the options at checkout. We have been in business for quite a while, and if you are an existing customer, we will beat anybody's prices on brake pads and replacement rotors, when and if you need them in the future. We recommend you start with the BP-10 pads. There are multiple reasons,
1. We would like to know how the BP-10's performed for you, as a measure to advise on your next set of pads.
2. The rotors are not cheap, and pads that are too aggressive for your style of driving will chew up the rotors much faster than necessary. With more aggressive pads, if they are not up to the proper operating temperature they will just destroy your rotors.
3. Pads that are too aggressive for your style of driving have several characteristics that are decidedly NOT for street driving. The more aggressive racing pads can make an incredible amount of noise if not up to temp, also the low temp performance will definitely surprise you as they need quite a bit more pressure to work when cold. Think of the first stop sign after you pull out of the garage.
4. BP-10's really are great pads, and perfectly suited for most driving and racing up to and over 150 mph. We have had a few customers over-use or consume these pads in a 3-4 months, but not all of us race 99 minute enduros every other weekend.
BRAKE LINES: All of our brake lines feature a tough clear plastic lining to resist wear to other near-by components, and permanent strain relief fittings on each end where the braided stainless steel line terminate into the AN-3 swivel fitting on each end. We include a -3 X 1/8-27 NPT male fitting, designed to fit perfectly into the back of each caliper, at the chassis end, we have a Toyota specific bulkhead connector designed to fit in the factory chassis mount perfectly. They are designed to work with the factory spring-loaded C-clip on one end, and the factory (pickle fork shaped) retainer on the other end to provide a factory fit and finish, and for ease of removal for servicing and installation.
The Two lines in this kit are specifically matched to the vehicle they are installed on. If applicable they include brake line guides that route and retain the brake line through the original factory retainers and hardline attach mounts. Just give a good tug to reposition the grommets and fittings at installation, and after a period of time the grommets will take a set and become very difficult to reposition.
Each brake line assembly include the following fittings:
2 Fittings to attach the line to the Wilwood calipers (-3 X 1/8-27 NPT fittings).
2 Custom brake lines specifically matched to your vehicle.
We have thousands of race miles on our brake kits (Road Race, SCCA, Ultra 4, BITD, Baja 1000, Baja 500) and a close relationship with our racers. We will be glad to share set up tips, and lessons learned. In the off-road community some of our racers have over 6 (4+ hour) races on one set of pads, and the rotors are nowhere near being used up. Do not mistake these as slightly better than the stock brakes, they are designed for racing, and happen to work well on the street. The performance of these brakes will blow you away. You will be able to race anyone way deeper into the corner than you ever imagined and laugh with confidence as you out brake them corner after corner.
Feel free to call us if you have any questions about race setup, bedding the brakes, installation or pad selection.