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Old 09-18-2003, 01:23 PM   #1
CRAZY KEN
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Default Rear Brake Upgrade...DONE!!!

...and it is sweet!!!

In the front, WRX 4-pot with DBA 295mm vented-slotted rotors cadmium coated grey!

In the back, H6 upgrade provided by SUBYSOUTH (thanks SUBYSOUTH for the great deal!!!) 1-pot with DBA 290mm vented-slotted rotors cadmium coated grey!

I didn't paint the calipers, because I like the look of grey rotors and calipers complementing the gunmetal LE37K!

...but I need to know of what pad I should use to replace the stock Subaru OEM pads.

SUBYSOUTH- which pads for the rear are you using??? or which pad shoud I be looking for???

I need a front set and a rear set...before and after pics coming soon!!!

I want the pads to bite and not fade...in particular at low to mild speeds20-30 mph to 60-80mph...street pad not racing pad


CRAZY KEN
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Old 09-18-2003, 01:40 PM   #2
SUBE555
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Could always look into ceramic pads, little dust and screeching but good overall heat range and bite. I run Tire Rack's Akebono ProACT ceramics on my stock calipers w/ SS lines and it works great for AutoX and high-speed handling. You might want to check out what Carbotech has though finding the rear pads might be a little more of a challenge, just not for sure on that. Look to see if TR carries the ProACT's for a late model OB.
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Old 09-18-2003, 02:24 PM   #3
CRAZY KEN
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Default GRAT-SEE

SUBE555...I'll check out tirerack!


CRAZY KEN
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Old 09-18-2003, 02:34 PM   #4
monovich
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aren't you selling your car, Ken?
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Old 09-19-2003, 07:48 AM   #5
etam
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Hey Ken, finally got the rear vented rotors? The rear pad is same as newer style rear 1pot caliper which starts from 99? RS but for sure same as WRX one.

How do you like them? less brake dive, right?
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Old 09-20-2003, 12:58 AM   #6
Patrick Olsen
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Quote:
Originally posted by etam
Hey Ken, finally got the rear vented rotors?
The H6 rotors are just larger, they're not vented. As far as I know the only vented rotors are the 1st gen Legacy turbo rotors (same size as stock BD/BG 2.5GT rear, but vented rather than solid) and then whatever expensive, exotic STi stuff is available now.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 09-20-2003, 10:25 AM   #7
etam
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Pat, actually, Ken meant to say H6 radial sized rear rotors (290x18).. technically, this is a JDM B4 rear brake setup.

http://members.rogers.com/manual/rear_vented_1pot.jpg

those are just red rust paint.. but now covered with brake dust...
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Old 09-20-2003, 02:21 PM   #8
Patrick Olsen
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Oops, my bad! I guess if I had actually read what he wrote in his original post I would have seen you were right.

Pat
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Old 09-20-2003, 03:29 PM   #9
etam
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this is a secret brake weapon by subysouth! just keep it within the Leg club!
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Old 09-22-2003, 12:09 PM   #10
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Sounds great Ken!

Yep the setup Ken has got is a rare bird indeed.

I sent you back a PM on the brake pad question. I am using the oem pads currently. Like I said in the email Legacy777 and I had both done the math on this setup recently and the bias adjustment of this setup on a BD-BG Legacy GTs is nigh on perfect. If you do the math you will find that the 4pots using the 294mm rotor output nearly indentical torque to the stock Legacy GT 2pots with the 277mm front rotors. This is due to larger piston size in the 2pots balanced against the larger rotor with the 4pots. The rear upgrade increases rear torque ~10% thereby shifting bias slightly rearward for more balanced braking. So my thoughts are to use identical compounds front and rear to start with as the setup is inherently well-balanced. Consider oem or less expensive off-the-shelf products if fade is not a prob and you want low noise/dust. If you want performance pads, there are a lot of great pads out there. DBASteve said they had done some pretty extensive testing and the Hawk pads faired really well.

On a side note, Steve's(monovich) 4/2 pot setup shares this same exact bias setup as well, because the rear single pots Kens has and the STi(non-Brembo) 2pots have the same piston diameter.

I am really glad to hear you got the rotors you wanted from DBA. They should be a perfect match for the fronts.

ss
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Old 09-22-2003, 09:32 PM   #11
Legacy777
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Sort of on that note of doing all those calcs.

I finally got around to doing all my brake work. Swapped the MC, and proportioning valve, & installed an MRT brake booster brace.

Initial results are very good. Pedal travel definitely decreased, and the overal braking of the car does feel more balanced out. I need to do some more agressive braking tests. Hopefully will be able to do that this weekend, and post a more detailed post in the brake & susp forum.

Just a quick note on the MRT brake booster bracket. That f@#kin thing is the biggest pain in the arse to install. I had to drill out one of the holes, so I could get all the bolts in. Then one of the bolts was stripped on the end due to all the monkeying around. I finally got it in. I spent more time on the brake booster bracket then I did on the MC & prop valve combined. However I measured the booster/MC movement without & with the brace.

Without the brace the assembly moved ~0.0050"
With the brace the assembly moved ~0.0025"
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Old 09-22-2003, 09:52 PM   #12
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Quote:
Originally posted by subysouth
If you do the math you will find that the 4pots using the 294mm rotor output nearly indentical torque to the stock Legacy GT 2pots with the 277mm front rotors.
Hmm.. I guess if I don't go to track day.. maybe I should go back to stock front brake! and I can pick up cheap wrx wheels everywhere! but having Subaru letter on the brake is so bling! (even covered with brake dust)
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Old 09-23-2003, 09:32 AM   #13
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Quote:
Originally posted by etam


Hmm.. I guess if I don't go to track day.. maybe I should go back to stock front brake! and I can pick up cheap wrx wheels everywhere! but having Subaru letter on the brake is so bling! (even covered with brake dust)
Dont do it etam, the 4pot upgrade brings more to the table than just the bling factor. Remember the vaunted Stoptech kit DROPS torque output 10% versus the stock WRX 2pot fronts, and this is a good thing because it improves front to rear brake bias. That larger rotor increases the margin of safety against pad fade and the feel and uptake are improved as well. Getting to the 294mm front rotor has been first on my brake upgrade agenda on both of my Legacys. I think that 294mm rotor is a big help in heat dissipation on even a quickly street-driven Legacy. Now that we know a lot more about the inherent torque these setups put out, factoring in a good rear choice to balance bias is like icing on the cake. Your 4pot front + B4/GT-B rear is(like Ken's) a excellent braking solution for the BD/G Legacys.

If youve got them I would keep them. Only time I would take them off would be to swap them to your next Subie.

ss
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Old 09-23-2003, 09:38 AM   #14
subysouth
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Quote:
Originally posted by legacy777
Sort of on that note of doing all those calcs.

Sounds good Josh. We had a pretty spirited bias discussion a week or so ago in the Brakes forum, we missed your input. I sent a guy back to your bias thread for your .xls file on the torque calcs and the page was a no-show. But we got it sorted.

Glad to hear your mods are working.

ss
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Old 09-23-2003, 06:02 PM   #15
Legacy777
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Quote:
Originally posted by subysouth


Sounds good Josh. We had a pretty spirited bias discussion a week or so ago in the Brakes forum, we missed your input. I sent a guy back to your bias thread for your .xls file on the torque calcs and the page was a no-show. But we got it sorted.

Glad to hear your mods are working.

ss
You got the link to thread?

I've been re-organizing my server and such, so file structure has changed. I thought I changed the links.....but I must have missed that one.
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Old 09-23-2003, 06:43 PM   #16
subysouth
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Quote:
Originally posted by legacy777


You got the link to thread?

I've been re-organizing my server and such, so file structure has changed. I thought I changed the links.....but I must have missed that one.
Here it tis:

http://forums.nasioc.com/forums/show...hreadid=415361

Sorry for the brief hijack Ken.

ss
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Old 09-24-2003, 09:06 AM   #17
Legacy777
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Quote:
Originally posted by subysouth


Here it tis:

http://forums.nasioc.com/forums/show...hreadid=415361

Sorry for the brief hijack Ken.

ss
tanka.....
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Old 09-24-2003, 01:09 PM   #18
CRAZY KEN
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Default SO...

...As per subysouth's recommendation, I should get front brake pads from a '96 Nissan 300ZX and rear pads from a '02+ WRX...wierd ayyy! He recommends stock pads, but I have stock pads already and would like to see the difference of a more aggressive pad. Any recommendations??? Somethings that bites and doesn't fade at low and mid range speeds (city/HWY driving)...25mph-80mph!



Thanks,

CRAZY KEN
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Old 09-25-2003, 12:32 PM   #19
MY99 2.5GT
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Ken - Do you have rear brake parts you are getting rid of?

I am trying to do a rear disc conversion on my Impreza L that currently has drum brakes. If you have anything you would be willing to get rid of please let me know.

Thanks
Brad
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Old 09-25-2003, 05:34 PM   #20
CRAZY KEN
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Default MY992.5GT

Yes sir, I still have it!!!

How much do you want for it?

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Old 09-25-2003, 06:02 PM   #21
subiekid
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you guys have problems with the DBA rotors making a clanking noise? a local wrx has them on the front and they make a clanking noise and its really anoying.
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Old 09-25-2003, 06:31 PM   #22
CRAZY KEN
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Default clunking!

subekid: no clunking noise here... I love my dba slotted rotors and 4-pot! More so with the matching rear dba, vented and slotted rotors.

I just ordered front brake pads for a '96 nissan 300zx turbo and rear brake pads for a 2002 subaru wrx...


???


Do i also need to get these???


4 Pot Brakepad Hardware Kit


STi 4 Piston Brake Clips


STi 4 Pot Slide Pins


OEM Brakepad Hardware Kit
'02+ RS And WRX Rear

BTW, subysouth, my rear brake kit i bought from you doesn't have any hardware...is this a big concern???


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Old 09-25-2003, 07:34 PM   #23
MY99 2.5GT
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Great news Ken.

What parts did you take off to do the conversion. What parts can you get rid of?

Brad
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Old 09-26-2003, 12:00 AM   #24
subysouth
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Ken your 4pots should have the cross-shaped parts and the pins. The plate-looking things are shims which snap to the back of the pads and can reduce noise(squeal) if you are having that prob.

The rear kit I sold you should have also have come with both the pad clips(they are snapped into the caliper brackets) and the shims(they are snapped onto the back of the pads.) If not PM me and I will see if I can locate them here.

ss
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Old 09-26-2003, 07:43 AM   #25
CRAZY KEN
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Default oh shiatzu...

...no hardware...ss...does that mean i am damaging my rear brakes, cause I don't got those clips or shims! I did notice a couple of times when i am coming to a stop that the rear brakes moaned. Well when I get my new pads...I'll installed the rear brake hardware and rear surface the rotors as well!

CRAZY KEN
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