Subaru rear drums?
10-16-2003 | 07:50 PM
#1
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Joined: Aug 2003
Posts: 168
From: Coquitlam
Car Info: 1985 Corolla AE82 FWD
Subaru rear drums?
Just wondering if the rear drum brakes are sufficient for Subaru's AWD?
I guess I fear that:
a) they'll be difficult to clean out if they get messy... or rusty...
b) the stopping power will be quite weak on the rear wheels.
please help!
I guess I fear that:
a) they'll be difficult to clean out if they get messy... or rusty...
b) the stopping power will be quite weak on the rear wheels.
please help!
10-17-2003 | 04:45 PM
#2
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Joined: Jul 2003
Posts: 686
From: SoCal
Car Info: PSM 2K2 WRX Wagon
Be more specific - ie, what kind of car do you have, what kind of driving, where you drive, etc...
Generally speaking, all drum brakes are messy (dusty) on the inside. And considering that in most normal braking only about 35% of your braking power comes from the rear (& only about 10% during very hard braking), you shoul br alright with drum brakes for most driving situations.
Generally speaking, all drum brakes are messy (dusty) on the inside. And considering that in most normal braking only about 35% of your braking power comes from the rear (& only about 10% during very hard braking), you shoul br alright with drum brakes for most driving situations.
10-17-2003 | 04:50 PM
#3
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Joined: Aug 2003
Posts: 168
From: Coquitlam
Car Info: 1985 Corolla AE82 FWD
I'm driving an old Corolla now.
But considering an Impreza L or Impreza Brighton (with drums).
I know for daily driving, they're fine. but I'm looking at more autoX and spirited driving.
10% only during very hard braking?? really?
But considering an Impreza L or Impreza Brighton (with drums).
I know for daily driving, they're fine. but I'm looking at more autoX and spirited driving.
10% only during very hard braking?? really?
10-17-2003 | 07:02 PM
#5
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From: Coquitlam
Car Info: 1985 Corolla AE82 FWD
ah, so chances are that I'll toast the front brakes and not the rears unless I somehow create a rear bias...
Okay. that makes sense. but does that apply to subbie's AWD too? I was thinking that you need to brake the back wheels too, ya?
Okay. that makes sense. but does that apply to subbie's AWD too? I was thinking that you need to brake the back wheels too, ya?
10-18-2003 | 08:29 AM
#6
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Posts: 686
From: SoCal
Car Info: PSM 2K2 WRX Wagon
There are alot of variables to brake design & I am not goting to pretend that I am an expert, but I can tell you what little I know. Just to explain more, the reason that your rear brakes are used so little when you are doing very heavy braking is that weight is transfered from the rear axle to the front. Of course if you drive a NSX(mid engine) or 911(rear engine) these percentages won't be accurate, because you would have more static mass over the rear axle. You can add hose in the **** th adjust brake bias, but I would definately recommend upgrading your rear brakes to discs first. Maybe you can swap the master cyc, and the front & rear brakes from a 2.5RS & that should still keep you STS legal.
10-18-2003 | 11:16 AM
#7
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Posts: 168
From: Coquitlam
Car Info: 1985 Corolla AE82 FWD
STS = street touring, right?
I'm trying to stay in H-stock, and I think a drum to disk mod would push me out of the boundaries. But I guess if it's only 10% of rear brakes, then it isn't a big deal.
But STS isn't that much different from stock, right?
I'm trying to stay in H-stock, and I think a drum to disk mod would push me out of the boundaries. But I guess if it's only 10% of rear brakes, then it isn't a big deal.
But STS isn't that much different from stock, right?
Last edited by dugrant153; 10-18-2003 at 11:19 AM.
10-18-2003 | 12:29 PM
#8
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From: Reno, NV
Car Info: 1993/2000/2001 GF4 mostly red
If you want to run stock, then you need to keep the rear drums. They are fine for autocross purposes. Later on, if you upgrade your front brakes (I would just save up and jump to 4 pots once you have RS wheels or 17s) then you will need the rear discs out of an RS or Legacy H6 or WRX.
10-20-2003 | 03:25 PM
#10
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From: Coquitlam
Car Info: 1985 Corolla AE82 FWD
I believe that changing just the fronts creates a front brake bias, or something like that.
I mean, a bias more than what may be recommended...
Someone care to respond?
I mean, a bias more than what may be recommended...
Someone care to respond?
10-23-2003 | 08:50 PM
#11
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Joined: Nov 2002
Posts: 42
From: Calgary
Car Info: 2002 OBS, 1998 Volvo XC
I first upgraded front brakes with WRX parts. Noticeably better braking power, but more brakedive too. Installing WRX rears balanced it out better, back to where it was originally. Also got crisper pedal feel, but can't tell how much was rear drum to disc swap vs ss line upgrade all around at the same time.
Jim
Jim
10-27-2003 | 10:43 AM
#12
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SS Lines on rear drums??
I've got rear drums too and have never had any problems. I do a lot of moderate rallying as well and actually like the way they feel. They lock the rear wheels the perfect amount into corners so I can come in sliding or start a slide whenever I need to. I want to put SS braided lines all around and from just the looks of it, I think they would work on the rear drum setup. Others have had doubts that they would fit the rear... I drive a '93 Impreza sedan AWD- front disc, rear drum. Any ideas or thoughts??
11-17-2003 | 11:23 PM
#13
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Posts: 168
From: Coquitlam
Car Info: 1985 Corolla AE82 FWD
that's pretty cool, Rallysportz.
unfortunately, I don't have an answer for that question.
I'm just as lost
Do you find that the stopping distance is different with rear drums vs rear disks?
unfortunately, I don't have an answer for that question.
I'm just as lost
Do you find that the stopping distance is different with rear drums vs rear disks?
11-19-2003 | 08:03 AM
#14
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Well like everybody else said, you aren't getting much braking power to the ground with the rear wheels when you're braking hard. I upgraded my pad to Axxis Metal Masters (soon to be Ultimates) which have much more bite on the rotors than a stock pad. Also the MRT master cylinder support bracket for that resists flex of the firewall when force is applied by the master cylinder. These combined has greatly reduced the stopping distance of my car, all for under $125 if you get the right prices. SS lines are a fun mod too but a little too sensitive for winter driving without ABS...