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Author Topic: Long awaited GS300 BBK  (Read 1753 times)

cuttyman9

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Long awaited GS300 BBK
« on: March 29, 2021, 10:47:55 PM »
For everyone interested in my GS300/GS400/GS430/Aristo BBK
(I believe 93-04, it痴 very possible supras and sc300/soarers will fit but before I claim it someone will have to confirm)

You'll need:

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

NOTE: I have found car-part.com is the cheapest place to search(60 per caliper) It痴 an annoying website but yields the cheapest prices outside of local junkyards which are the cheapest (25 per caliper)

The calipers should say 17ZL and 17ZR (it痴 come to my attention most parts stores show the rotor size, 330mm instead of 17z so tell them 330mm is the caliper you need lol)
PNs 20.8432.06 and 20.8432.05 (see pictures)
(use these numbers to confirm, there are many calipers that look similar but wont work)


覧覧-HARDWARE覧覧-
4x M12-1.75x30 (McmasterCarr.com PN 90128A297 - Socket cap style bolt or equivalent)

4x SCH M16-1.5x40 caliper bolts
(or reuse the hardware from Cayenne/Toureg/Q7 on the top bolt hole, the lower holes are too close to other things)
(Mcmastercarr.com PN 96144A330)

8x  Fastenal PN 0136087 or  1245L from ace hardware
 https://www.fastenal.com/products/details/0136087
 (~2.5mm thick)

30mm Roll Center Adjusters (RCA)
(available soon for $150)
 
覧覧覧-ROTORS覧覧-
Rotor specs should be 356x30mm- confirm that before ordering as there are many that are 334 which will not work.

1x 2013-2018 GS350 F sport rotor-121.44204 front iron brake rotor (Centric PN shown)

1x 2013-2018 GS350 F sport rotor-121.44205 front iron brake rotor (Centric PN shown)

**These are not gsf rotors. Is350 f sport do not work either.
Only gs350 F sport.**


For drilled and slotted use this link, make sure to request only fronts (courtesy of Kirk smith)
https://www.ebay.com/itm/401594122059




Stock brake lines can be used although I would recommend getting stainless braided lines as it improves feel vastly.


Make sure to take the crossover lines and bleeders off and switch sides with them (because the cayenne/q7/Touareg have the caliper on the front of the knuckle and the is300 has them on the rear of the knuckle)



NOTE: Calipers will need to be modified
See pictures in later posts.

NOTE: The Washers will go between the bracket and the caliper.





** UPDATE**
18z calipers WILL NOT WORK (without custom pads and more clearancing on the back but none for the rotor)

The OEM tie rod/ball joint fits it better.

If you purchased calipers bare the hardware to mount the pads can be had here:
https://audibbkparts.bigcartel.com/product/brembo-17z-18z-caliper-hardware-kit
« Last Edit: March 29, 2021, 11:07:09 PM by cuttyman9 »
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Long awaited GS300 BBK
« Reply #1 on: April 20, 2021, 06:25:00 PM »
Here are a few pictures of the clearancing needed to fit these to a GS300.

Due to the unusual tie rod mounting on the same side as the caliper it takes a little bit of work to make this happen but it痴 a budget friendly setup.

Do note that some of the clearancing on this specific caliper was setup for the is300(friend of mine had an IS and decided to switch to GS and the clearancing isn稚 the same) the cnc machining is the IS300 and the grinder part is for the GS)

Something also different about GS vs IS is the edges near the bolt holes need to be clearanced on the lower part of the caliper to clear the knuckle.(picture of red caliper)
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Long awaited GS300 BBK
« Reply #2 on: April 20, 2021, 06:30:10 PM »
Closer looks at the two spots specific to the GS.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Long awaited GS300 BBK
« Reply #3 on: April 20, 2021, 06:36:30 PM »
This shows the clearancing on the lower bolt hole of the caliper

The next picture shows the differences between calipers after clearancing has been performed.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Long awaited GS300 BBK
« Reply #4 on: April 20, 2021, 06:38:21 PM »
Here痴 a couple of measurements to show about how much is removed from the radial area of the caliper.
These suckers are so thick there痴 still a ton of meat there.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Long awaited GS300 BBK
« Reply #5 on: April 20, 2021, 06:40:05 PM »
This is the rough thickness of the washers.
The least amount of washers means less clearancing on the backside.

Some have used enough to center the caliper, this is how many I installed upon mockup.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Long awaited GS300 BBK
« Reply #6 on: April 21, 2021, 09:02:47 AM »



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Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

 

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