IS300/GS300 Rear BBK

[cuttyman9]

Due to the popularity I developed an IS300/Altezza rear BBK
*edit: also fits 1998-05 GS300 and GS400 and GS430


Purchase here (priced per pair):
https://marketplace.sendcutsend.com/p/CK60B934/lexus-is300-and-gs300-rear-bbk-brackets

Brackets are untapped, you will have to buy an m14-1.5 and m12-1.75 tap to finish them.


You'll need:

覧覧覧CALIPERS覧覧�
02-10 VW Toureg
03-10 Porsche Cayenne
05-15 Audi Q7

(I have found car-part.com is the cheapest place to search, its an annoying website but yields the cheapest prices outside of local junkyards)

PNs  20.7673.03 and 20.7673.04 (see pictures for the location)


覧覧�-HARDWARE覧覧�-

4x hex M12-1.75x25 (30mm will work as well)
(McmasterCarr.com PN 98093A746)

4x hex M14-1.5x30 (35mm long will work as well)
(or reuse the hardware from Cayenne/Toureg/Q7, Even though they are a bit long.)
(Mcmastercarr.com PN 91180A778)
 
覧覧覧�-ROTORS覧覧�-

2x 2008-2014 ISF rear brake rotor  PN PRT6106

覧brake lines覧
Stock brake lines can be used although I would recommend getting stainless braided lines as it improves feel vastly.  (testing soon)



NOTE: Calipers will need to be modified but only slightly.
Depending on brand of pads clearancing the of weights might be needed. (see later posts)
I found this tool works very well for this little bit of clearancing and is pretty damn cheap!

https://www.harborfreight.com/power-tools/grinders-sanders/portable-belt-sanders/53-amp-12-in-heavy-duty-bandfile-belt-sander-62863.html

Their sanding belts are kinda shitty so prep for using a few.


**You will remove the brake line cover and the rubber isolator and bend the brake line up and away from the rotor area.**


**the brake lines and bleeders need to be flipped as the small pistons are on the top and the big pistons are on the bottom.**

[sg207]

Very excited to see pictures. Just finishing up the front BBK that I got from you and matching rears would look awesome.

[cuttyman9]

These are the caliper PN's I used. I would imagine there are alternates that are the same (the last 2 digits are usually different if they are a variant.)

This is the amount of clearancing required, it is very light relative to the front bbk.

[cuttyman9]

The modification to the crossover tube is here.

The rubber needs to be removed from the line itself. The line cover cannot be used without mods, I omitted it.

The line should be bent carefully away from the rotor. Without the rubber part it will have more space to move.

[cuttyman9]

This is the rear hardware that can be reused. This is the socket I found that fits haha. It's not the right way, but it does work. Cheap at harbor freight with the kit.

[cuttyman9]

This shows roughly how tight the line needs to tuck to the caliper to both keep it safe and clear.

The green arrow and red boxes show a point that potentially might need clearancing depending on variances in pads. I have some that cleared and some that didn't.

[cuttyman9]

this shows the brake line crossover and the bleeders that need to be swapped.

you can see here how similarly placed the caliper is, this means the stock brake line will work.





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This off-road race only product ("this Product") is designed and intended for use in organized, amateur and professional racing events, but is limited to closed-course racing and open-course racing that is formally sanctioned by a recognized racing organization involving the motor vehicle in which it is installed (the "Vehicle"). It is not for use on public highways or roads nor is it for recreational off-road use other than solely for competition purposes. The person or entity buying this Product and/or using this Product (the "User") agrees to use the Vehicle solely for competition uses as described herein.
 
The User accepting this disclaimer acknowledges and hereby indemnifies and saves harmless Overkill Engineering, its officers, employees, agents, distributors and dealers for any damages, penalties, fines, expenses or other costs which may arise from the use of this Product and without limiting the generality of the foregoing specifically acknowledges the following:
 
   Use of this Product for purposes other than solely for competition is a violation of federal law and may violate applicable state or local environmental, motor vehicle and other laws. The User warrants that this Product shall only be used in sanctioned closed-circuit events.
-That use of this Product may violate warranties from the manufacturer of the Vehicle or from others.
-That use of this Product may make the Vehicle unfit or unsafe for the purposes intended or for any purpose and cause personal injury, property damage or death.
-That the installation of this Product, improper installation of this Product, use of this Product with other components or failure to use this Product in conjunction with other components, could result in or cause personal injury, property damage or death.

[waf5027]

Factory caliper bolts are M16 triple squares.

[cuttyman9]

Good to know! Thank you!

[cuttyman9]

Updated with the send cut send link!

[cuttyman9]

Looking into releasing a new file that uses a bolt that passes through rather than thread your own in the top post.

M14-1.5x45mm needed for the front caliper to bracket.
M14-1.5 nut

M12-1.75x35mm needed for the bracket to the knuckle.
M12-1.75 nut

Purchasing link for thru hole type (priced per pair):
https://marketplace.sendcutsend.com/p/C030A012/lexus-is300-and-gs300-rear-bbk-brackets-thru-hole-type

These do not require tapping.