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Old 05-05-2003, 01:48 AM   #1
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Default Parts need to swap drum to disk on 2002 TS?

What is the Parts need to do drum to disk swap on 2002 TS
any 2002 TS owner have done this?
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Old 05-05-2003, 04:47 AM   #2
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Reset, it may be different for the TS but should be the rotor, caliper, backing plate, mounting bracket, e-brake cable and possibly the hubs.
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Old 05-05-2003, 09:00 AM   #3
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There are a few ins and outs to it. The ebrake is a pain to hook up, there is some uncertainty as to the setting on the proportioning valve, the holdback valve may present a minor problem, so in theory some issues about front rear bias.

Several people have done it with no major ill effect. If you do it put in SS lines at the same time, much easier then than later. A big advantage IMO is the ability to install SS lines and a bigger choice of grippier WRX pads all around, like Axxis Ultimate. So if you bother at all, go all the way.

Oh yeah, insurance can be an issue. If you have an accident, your insurance company can claim you were "tampering with your brakes", especially if brake failure (unlikely) is the cause. Best to get a licenced mechanic to do it anyhow.

Try searching this forum, keyword drum, any date, lots more info.

Jim

Last edited by codger; 05-08-2003 at 07:45 AM.
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Old 05-07-2003, 02:25 AM   #4
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I have got rotor, caliper, backing plate, mounting bracket, and hubs from a 2002 WRX.
I think I still need e-brake assembly, front knuckle,and rear drive shift.....not sure can someone confrim please?

Thanks
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Old 05-07-2003, 03:35 PM   #5
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You certainly don't need a rear drive shift (whateverthatis)
No front knuckle need (we are talking about rear brakes right?)

You just need e-brake assembly and ebrake cable and some brake pads.
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Old 05-08-2003, 02:58 AM   #6
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Although I doubt anyone has done it you should get the Proportioning valve from a vehicle that had discs to begin with. Its not as simple as just bolting the new one up, so everyone ignores it.

Not only are the drums activated BEFORE the fronts but the amount of fluid sent to them is minimal. No one wants to look into it but Im fairly certain many who have performed this swap essentially disabled the rear brakes after the swap.
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Old 05-08-2003, 05:22 AM   #7
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Quote:
Originally posted by ciper
Although I doubt anyone has done it you should get the Proportioning valve from a vehicle that had discs to begin with. Its not as simple as just bolting the new one up, so everyone ignores it.

Not only are the drums activated BEFORE the fronts but the amount of fluid sent to them is minimal. No one wants to look into it but Im fairly certain many who have performed this swap essentially disabled the rear brakes after the swap.
This is a very valid point, the rear discs are no good if the calipers never have enough fluid in them to clamp down.
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Old 05-08-2003, 07:41 AM   #8
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Ciper, I think we went over this before on this thread

Several people who have actually DONE this swap pointed out the immediate benefits they felt, in contradiction to the theory you are putting forward. I've also chatted with 4 or 5 other people who have done it, and none of them experienced the problems you continue to speculate about.

If you can show me that the split point and reducing ratio are different in the TS/OBS vs the WRX, and show me proof of the existence of a holdback valve in the TS/OBS (photo, part #), then you have something new to offer

Jim

Last edited by codger; 05-08-2003 at 03:54 PM.
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Old 05-08-2003, 03:45 PM   #9
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I saw some posts on another board (will look for them) where the poster had checked part numbers and the proportioning valve was the same between drum/disc models. In fact I remember the post going on to say that the mechaninsm in the drum does the proportioning / fluid quantity job, thereby allowing the manufacturer to keep more parts consistent.

I too have spoken with a rally team mechanic who had a customer do the same swap in a '02 OBS. This customer did ice racing and commented on the better brake modulation with the discs.

But all the info in this thread is second hand or speculation. That being said, I plan on doing the swap in my TS.

Jason
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Old 05-09-2003, 12:29 AM   #10
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Ok, I found a link with part numbers: link

Looks to me like the main parts that are for WRX only are the vacuum booster assembly, the vacuum hose and the clip for the hose. The master cylinder assembly is the same part number for WRX or OBS: 26401.

Also, if you look around on the site to the diagrams of the various braking systems, there is no holdback valve evident.

Jim

Last edited by codger; 05-09-2003 at 06:40 AM.
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Old 05-09-2003, 07:34 AM   #11
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Here's a link to another good thread on this topic. Toward the bottom of the first page, legacy777 posted a scan from the service manual. It summarizes the various Impreza braking systems; it shows various models having drums vs discs, or different size rear discs. However all models appear to share the same Brake Booster, MC, and Proportioning Valve, with the same split point of 285 psi and reducing ratio of 0.3. So more evidence that perhaps the New Age TS and OBS already have the correct MC for the swap. As I mentioned in an earlier thread, Subaru may find it simpler and cheaper to use one set of parts across all models, and adjust for bias by just sizeing the drum piston accordingly. This way we would get the same amount and pressure of fluid going to the rear brakes, and get the same or similar amount of ultimate rear brake torque.

Jim

Last edited by codger; 05-09-2003 at 07:41 AM.
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Old 05-09-2003, 03:43 PM   #12
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I dont mind to be wrong, now we have some good data on the subject. Personally I rarely trust when people say "I did it and it feels great."

Now with the additional information that the associated hardware is the same with the Disc and Drum equiped vehicles Im satisfied.

Realize none of my Subaru have drums, so my intent wasnt for my own benefit.
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Old 05-10-2003, 09:30 AM   #13
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Ciper,

You certainly raised a valid line of enquiry. While I believe there are no issues within 2002 and 2003 swaps, at the moment there is no such tangible evidence for New Age/Old School swaps. We could test this in a number of ways though:

- are people who have done the swap wearing out and replacing rear brake pads at a typical pace?

- after pulling the ABS fuse, try several panic stops, past an outside observer. Look for abnormal front or rear lockup. Ideally compare between stock four wheel disc, stock drum/disc, upgraded 4 wheel disc. Might want to try this on gravel to avoid flat spotting, or use some tires you really hate

Jim
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Old 05-10-2003, 11:13 AM   #14
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JIm,

great information......if you get anymore links etc please send them my way as I may not catch them.....

BTW- with that info my brake sway is looking better and better everyday.......

spt
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Old 05-10-2003, 01:04 PM   #15
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Quote:
BTW- with that info my brake sway is looking better and better everyday.......
Me too. Those WRX rear brakes in my garage have been gathering dust for way too long. As soon as my SS lines come in, it's goodbye drums.

Jim
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Old 05-10-2003, 01:12 PM   #16
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Quote:
Originally posted by codger


Me too. Those WRX rear brakes in my garage have been gathering dust for way too long. As soon as my SS lines come in, it's goodbye drums.

Jim
ya me too kinda...I will be ordering my SS lines next monday and than I should have both by that weekend and then its just installing them

spt
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Old 05-11-2003, 01:49 AM   #17
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Quote:
Originally posted by codger


Me too. Those WRX rear brakes in my garage have been gathering dust for way too long. As soon as my SS lines come in, it's goodbye drums.

Jim
I not sure about '02 OBS
But my '02 TS need some more parts other then WRX rear brakes to do the swap.
the shop tell me I need the whole e-brakes kit for WRX disk, and some parts supposs to go though the backing plate is too big
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Old 05-11-2003, 06:45 AM   #18
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Quote:
But my '02 TS need some more parts other then WRX rear brakes to do the swap....
Yes you do need more parts. I made sure to get the whole shebang from a WRX: everything past the axle, including the e-brake cable.

Jim
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