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Old 27-12-2007, 06:07 PM   #1
dave0r
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HOW TO: DIY 2 pot brake upgrade

Old Busted!


New Hotness!



This ONLY applies 4 stud BG or BA models, GTR/GTX BG unknown, BA V6 will need some playing with different rotor sizes





So far i have found two options for this upgrade
one requires cutting of stuff
the other is bolt on

first the parts for option 1 ( No cutting of stuff)

BA V6 hubs complete
BG 4 cly 4 stud wheel bearings and 4 stud centers x 2
Rotors; Your choice of either Slotted/drilled BG GTX/ Astina GT rotors or NB8 MX5/Miata rotors (270mm), * Pads overlap 1mm when using stock 257mm rotors
Calipers; BJ series wagon Subaru Legacy GT turbo (2pot)
Brake brackets; Mazda GD 626/TX5/Probe
Washers of 2-3mm , Cyl head bolt washers work well (i'll explain later)
Brake pads; as above, but use some Bendix DB1114 or something better than OEM
Brake lines; your choice of either OEM/Braided etc for BG models * Careful, there are two types ive found, a large and a small Neck Banjo head, i tested using the a split small neck type, all ok, but my car was fitted with a large neck banjo bolt. Large neck requires filling down part of the caliper, 5 mins extra

First Push out the V6 5 stud Center, push in the 4 stud center
Paint/bling up the calipers from the Subi/Mazda combo

Take note of the numbers on the caliper " AD602T " this may have changed during the Subi models, but you need the one with 1 bolt , not 2



the orange brings out the color in my eyes :P , best of all NO cutting :P , just bolt it to the V6 hubs, put 2-3mm thick washers between HUb and caliper to be on the safe side, ie DONT TEST FIT using 21mm Rotors when you have 22mm, kinda confuses you when you see 4mm clear on side yet only 1.5 on the other

removal of old setup from ya car,

Fit new rotors, , put the good heat/copper grease on moving parts and bolt together with new pads
check steering arm lengths are ok, bleed them brakes, run/ bed pads in ,, DONE


Option two (cutting, swearing, beer/bourbons, & time) <-- i No longer recommend this unless you enjoy trial and error.. **** IT

Parts for Option 2

BA V6 hubs complete
BG 4 cly 4 stud wheel bearings and 4 stud centers x 2
Rotors; Your choice of either Slotted/drilled BG GTX/ Astina GT rotors or NB8 MX5/Miata rotors (270mm)
Calipers; T series Mazda Millenia/Xedos 9 S/C or 2.5 V6 (2pot)
Brake brackets; As above
Brake pads; as above, but use some Bendix DB1326 or something better than OEM
Brake lines; your choice of either OEM or Braided etc for BG models *work fine with either small or big neck banjo heads

Take note of the caliper cast numbers "AD43T" and 2 bolt arrangement






You need to cut back this much off the caliper bracket, tiny amounts off the hubs, casting line was in my way on 1 hub, other was ok

* The bracket side facing the Wheels needs to be "trimmed" if it hits your wheels...my 14" OEM mazda mags clear it..yet my Enkai stuff hits the bracket, needs a good 2-3mm trimmed off it ...<--reason i gave up for the night




The bolt holes in the V6 hub needs to be drilled out 2mm to fit the millenia bolts, 14mm i think? i didnt do that bit



the dust sheild? also needs a tiny amount chopped off, 2mm as it hits the corner of the bracket

Strangely but there is NO overlap on the Millenia pad when using stock Astina GT rotors???


Passes the 14" wheel test, i started to laugh when this fitted


drop new pads in
Fit new rotors, and bolt together

removal of old setup from ya car, Bolt in the above setup, check steering arm lengths are ok, bleed them brakes, run/ bed pads in ,, DONE[/b]
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Last edited by dave0r; 28-12-2007 at 07:11 PM.
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Old 27-12-2007, 08:47 PM   #2
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Which pads fit in this combo?
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Old 28-12-2007, 04:57 AM   #3
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re-read it again
the pad you use is based off option 1 or 2
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Old 28-12-2007, 06:36 AM   #4
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well for someone that doesn'y own a car with DB1114 or DB1326, what do they look like?
or are they just the 2nd and 3rd pads in the 1st pic?
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Old 28-12-2007, 06:44 AM   #5
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Top is GTX one
Middle is Option 2 pad
bottom is Option 1 pad
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Old 29-12-2007, 01:11 AM   #6
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aaaaaaaaaaaaw, how do these go ? they look really beefy and look like would stop the rotation of the earth!
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Old 29-12-2007, 01:16 AM   #7
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skimmed over that quickly cause its late.. but got an approximate price on either of the methods? no exact numbers, just a ballpark?
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Old 29-12-2007, 10:55 AM   #8
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its still a work in progress

they are fitted to the car..and stop the car nicely
i need to get new rotors and pads (only test at this stage)
pedal feels a little spoungy , prolly got air bubble still

price all in NZ $$$

Hubs $40 each
Calipers $40 each
Brackets $10 each
Pads $ take ya pick. new from Repco in NZ $88
Rotors $ take ya pick new from repco $130 each

labour, i was charged $50 to push out the bearings and drill the hubs to fit the larger bolts , but thats not required in option 1

misc,...brake fuild, new lines, paint, cleaner etc...all adds up
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Old 30-12-2007, 05:16 PM   #9
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wow thats really good, especially as its for the 4 stud astina's and everything i've read is for 5 stud. would love to see a setup like this first hand.

out of interest, why did you only paint the outside edges of the caliper?
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Old 30-12-2007, 05:30 PM   #10
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Quote:
Originally Posted by dave0r View Post
New Hotness!

Hope you put the hub bolt back on before replacing the wheel back. lol
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Old 31-12-2007, 06:22 AM   #11
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yup sure did

that bolt took ages to undo...
its as tight as i can get it now ,whole car moved when using massive leaver bar
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Old 01-01-2010, 09:39 AM   #12
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hey i was just wondering on this mod, you can use the the pot breaks from a BG familia 323 right? coz thats also a gtx
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Old 22-08-2012, 08:10 AM   #13
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Quote:
Originally Posted by so fresh View Post
hey i was just wondering on this mod, you can use the the pot breaks from a BG familia 323 right? coz thats also a gtx
there the same as a bg sp front brakes mate..

i have an update to do to this thread.. too will post up in the next coming weeks
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Old 13-09-2012, 01:41 PM   #14
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Hurry up and do it
I want to do a brake upgrade and i need it before i get the car back on the road but i dont want to go to v6 hubs,
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