How-to; DIY 2 pot brakeupgrade

[dave0r]

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 , best of all NO cutting , 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]

[therieldeal]

thats awesome! thanks!!

[Turpro]

Thanks for sharing this great info.

Now its a sticky

[Mazda_Powered]

We dont have the BA V6 spindles

Whats the difference between those and your astina gts? (BG with rear wheel disk)

JACK.

[dave0r]

Spindles on the Astina GT are the same as anyother BG with 4 dics, The BA V6 has larger hub arms so you can bolt this together

If i may, next time you US blokes are at the j/y see if the hubs from 626/telstar/"something thats KL/K8" and see if they bolt to a BG setup

[FE3-323]

I like the increase in pad material alot!!!


one should calculate the increase or decrease in pad force by measuring the piston diameters & running the calc. its been noted with mx6 guys that dual piston actually reduces brake pad force by 1-4% while however minimal I wouldn't consider it an upgrade.

IDK if you could get the part number for the rear astina hubs for me & PM it my way, i'll be upgrading to 5 lug fronts next year should be in this format for the part number b455-18-710a or something similar

[dave0r]

Yeah the brake force should be good, more even,...even with out the larger booster and prop valves (i'll try the BG setup first, then switch to the larger booster,prop setup)

[therieldeal]

ryan you may be decreasing the pad force slightly, but really all that is going to do is shift the brake bias a little more to the rear. since its already biased rediculously to the front, it should be fine.

[dave0r]

bpt323; i have some rear V6 astina 5 stud hubs if you need them ..might need to part a kidney for shipping, they are heavy

[therieldeal]

the hub/bearing assembly that bolts to the rear spindle?

[dave0r]

yup completed rear 5 stud setup, BG calipers at the back
and just the 5 stud bearing/spindle setup for the front same spline count as BG , but i havent checked lengths etc

[dave0r]

updated!

[protege94 P.R]

Ok, this sound very good: But we dont have Astina's, GTR, here in PR

I will like to ask some questions

-Rotors to Use? can I use my stock Escort Gt

-Caliper bracket? just to be correct mazda 626

-Spindle mount? 626 but whant to know if the struts have to be change or can I use stock ones

-What year of 626?

-Are the bolt joint's the same as the Escort Gt

-Last one the hub? is the same Escort Gt and 626 in the bearing diameter just have to pull out the 626 hub and put mine

Thanks

[dave0r]

Ok, this sound very good: But we dont have Astina's, GTR, here in PR

I will like to ask some questions

-Rotors to Use? can I use my stock Escort Gt
Yes stock rotors, recommend upgrading to 270mm NB8 Miata/MX5

-Caliper bracket? just to be correct mazda 626
Anything from a GD mazda , 626/probe/tx5

-Spindle mount? 626 but whant to know if the struts have to be change or can I use stock ones
626..NO ...you need BA or CBA V6 ones

-What year of 626? Depends on country, i got mine from a 1988

-Are the bolt joint's the same as the Escort Gt
Im using the ball joint from the BA V6 hubs, appears they have a bigger hole into the hub than the BG, but are the same lenghts

-Last one the hub? is the same Escort Gt and 626 in the bearing diameter just have to pull out the 626 hub and put mine No sure on that one..IM using a BG bearing center on one side..and a EC MX3 bearing center on the other, both appear to be the same

Thanks

[protege94 P.R]

Thanks for the new info so its time to start looking for parts for my car.