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Old 07-14-2002, 06:29 PM   #1
danc
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Default Drum to Disk swap on OBS? ABS issues?

I've read about people swapping out drums for disks on L's, but not on OBS. Does the ABS pose any problems?

Thanks!
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Old 07-14-2002, 08:54 PM   #2
rkkwan
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OBS rear brake conversion must read:

http://wac.addr.com/auto/obs/disc/disc.html

No mention of any ABS problem.

-Ray
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Old 07-15-2002, 03:00 AM   #3
christoph1371
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did it to my obs 2 weeks ago. no problem whatsoever.
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Old 07-15-2002, 08:21 AM   #4
peepshow
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No problems, as long as you make sure the new hubs that you are getting are from an ABS equipped car.

- Trent
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Old 07-15-2002, 02:26 PM   #5
christoph1371
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Did I forget to mention that...woops

BTW, i also forgot to mention...the e-brake sux to replace
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Old 07-15-2002, 05:43 PM   #6
omahasubaru
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I started this process this past weekend and if it weren't for my rear control arms being ceased onto my drum hubs I'd be done. alas no amount of force from the BFH or WD-40 or propane torch heat could bust that bolt loose. So now I have to find control arms now. I'm considering MRT as they are only about $50 more than ordering stock ones from SOA with better bushings and are adjustable.

I've got pics of parts of the process, but the e-brake assembly re-work isn't too bad in the wagon compared to a sedan I'm sure. That and making sure you get the cables with your new hubs will help too.

I'll post a link in here when I've completed and documented my upgrade. Here's the parts I installed

Front:
WRX front rotors calipers & pads with Cobb SS brake lines

Rear:
Legacy Turbo rear disk brake ABS hubs with ventilated rear rotors calipers and pads with Cobb SS brake lines
MRT rear adjustable control arms.

Calipers were painted red and main center section of rotors painted black to prevent oxidation/dis-coloration and to look better.

Will be putting a set of loaner Rota Battles on as well, just for fun for a week or so.

Jon
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Old 07-16-2002, 12:07 AM   #7
codger
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Quote:
BTW, i also forgot to mention...the e-brake sux to replace
I read the drum to disc brake conversion website, and the e-brake seemed like the most challenging part. Remove the seats, plastic center console, pull up the carpeting, maybe a few side interior plastic panels to do that. All this to fully access the e-brake and cable. My brand new OBS isn't quite ready for this yet.

Is there a less invasive way to hook up the e-brake?
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Old 07-16-2002, 04:12 AM   #8
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cut the carpet with a razor blade (which is what i did. you can't even see the scar )
or as i also determind, cram your hand under the carpet to pull up that cable...ouch
BTW i used 2000 rs rear disc assembly ...inc e-brake.
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Old 07-16-2002, 09:26 AM   #9
codger
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Thanks for the info guys. I just got a set of front and rear WRX hubs, knuckles and brakes that I'll eventually install. Looks like I might need to get an e-brake cable though. I don't expect any problems with the ABS though, but we'll see.

I'm planning to find a mechanic willing to look at this in August. I've heard that in Alberta anyway, the insurance companies prefer a licenced mechanic to handle this sort of thing. Kinda hard to explain if you rear ended somebody and they see you've been "tampering with your brakes"

Sorry for the post hijack, danc

Jim
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Old 07-16-2002, 10:01 AM   #10
omahasubaru
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2002 OBS's have drum brakes in the rear??? What the heck subaru??? Disk brakes are the only way to go. the OBS isn't the base model car it used to be.

Urgh, what are they thinking?
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Old 07-16-2002, 11:21 AM   #11
Rebellion
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the OBS was never a base model car... and it's always had drums in the back... but hey.. at least they're making em standard w/ 16" alloys now.

I'm going to do this eventually to my OBS. I dunno how much my wife would like me tearing up her carpet though.
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Old 07-17-2002, 04:25 PM   #12
omahasubaru
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There's no need to tear up the carpet, only to pull it up. It's quite safe/fine to do, it's not like it's glued down or something. Just think how safer she'll be especially in an emergancy situation. Especially if you go to bigger (WRX standard) brakes up front.

Just my $0.02... it isn't just a performance mod, it's ease of service and safer/better.

Jon
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Old 07-17-2002, 05:37 PM   #13
peepshow
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Rebellion, the OBS did have rear discs for a short period of time during MY95, I think. It might have been MY96. But for a year or so, they had rear discs. However, I agree with Jon, in this day and age, there is no reason for the OBS to come with rear drums still. Hell, the L shouldn't even have drums anymore!

- Trent
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Old 07-18-2002, 09:57 AM   #14
omahasubaru
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Quote:
Originally posted by dsmawd
I agree with Jon, in this day and age, there is no reason for the OBS to come with rear drums still. Hell, the L shouldn't even have drums anymore!- Trent
The point to this is, there is no more Impreza L.. There is the RS (4 wheel disk) and TS wagon.... I'm sure the TS wagon has rear disks, but if I'm wrong (as above someone posted they wanted to convert) then Subaru truely is stupid. I can't imagine that Current MY02 OBS and TS wagons have anything but disk brakes, can anyone confirm deny? All the dealerships around here either have WRX's or RS's, no TS or OBS... except I see a few on the road. I'll have to run one down or go to SOA's site.

Jon
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Old 07-18-2002, 10:13 AM   #15
peepshow
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Ooops, I guess the old-schooler in me slipped out! I MEANT TS, even though I TYPED L. Silly me.

Jon, the sad fact is, yes, any Impreza below the RS trim level gets rear drums to this very day. Even the OBS. Dumb.

- Trent
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Old 07-18-2002, 10:54 AM   #16
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Quote:
Originally posted by dsmawd
Rebellion, the OBS did have rear discs for a short period of time during MY95, I think. It might have been MY96. But for a year or so, they had rear discs. However, I agree with Jon, in this day and age, there is no reason for the OBS to come with rear drums still. Hell, the L shouldn't even have drums anymore!

- Trent
I've seen stuff before about the 96 having rear discs... but I can tell you that mine doesn't.
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Old 07-18-2002, 11:04 AM   #17
Swano
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Well guys, unfortunately, the MY02 TS has rear drum brakes...

It's next on my mod list.
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Old 07-18-2002, 12:11 PM   #18
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There is one small defense for rear drums. They hold up much better than discs in areas with salted roads. The front wheels throw up all the crud onto the back wheels. Rear discs calipers will fail after 4 or 5 years in salt country, where as drums last practically for the life of the car.
Since Subaru sells more cars in snowy climes, they may be trying to save us money or caliper rebuilds.

Also drums are as effective in braking on the first stop before fade becomes as issue due to higher heat retention.
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Old 07-18-2002, 12:24 PM   #19
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Quote:
Originally posted by Rebellion


I've seen stuff before about the 96 having rear discs... but I can tell you that mine doesn't.
ABS-equipped Imprezas had rear disk brakes through 1996.
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Old 07-22-2002, 01:07 PM   #20
omahasubaru
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Anyone looking for some free rear drum set-ups or parts from them let me know. My swap should be complete this week. I had some major rust issues and had to replace quite a few items... The worst being rear control arms and the second worse being 1 rear half-shaft as even the 1/2" thick steel remover tool was flexing trying to push the axle out. the BFH method didn't work either.

The shoes and drums appear to be in good shape and I have the complete hubs if you want them, but I'll advise you the stock rear control arms are ceased on to them and only the bushing flex is the amount of movement you can get from them. The drums and shoes themselves are good though.

I will post pictures and some info when I have a chance. I didn't do a step by step thing as it is pretty self explainitory.

Jon
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