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Old 05-26-2010, 09:32 AM   #1
Dobes
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2008 Exige S240

Default Brake booster upgrade for BDs?

Can anyone confirm what type of brake booster a '97 GT would have? I remember my '98 RS (and I believe all Subaru's with ABS) came with a dual stage brake booster which resulted in a really spongy pedal feel. I tend to think the '97 GT had the same booster. One of the popular early modifcations on the 'RS was to replace the brake booster with a single stage unit from a non-ABS equipped car to firm up the pedal. I was wondering if a similar upgrade could be made with the earlier Legacy's since my pedal is far from firm (even after several brake bleeds). I'd also be interested to hear how difficult it is to swap out the booster since getting air into the ABS system can be a real pita to resolve.

Thanks,
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Old 05-26-2010, 02:00 PM   #2
Legacy777
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AWD 6MT EJ22T AWIC Swap

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You should have a tandem brake booster. Tandem is the correct terminology, there's not two separate stages, just two diaphragms working together.

Yes, you should be able to swap in a single diaphragm booster. Are you looking to put an early legacies booster into your 97, or get a single diaphragm booster to put in an early legacy?

The 95 era rear drum Imprezas were the main cars I found to have the single diaphragm booster.

As for swapping the tandem booster out. The MC does need to be removed. There are four bolts holding the booster to the pedal assembly. They can be a little bit of a pain to remove, but it's not too bad. Then just reassemble. The brake lines will need to be bent slightly since the booster is smaller. Then you need to just bleed the brakes.

One thing to note, you need to make sure the push rod on the single diaphragm booster is at the same spot as the booster you remove. If the pushrod is out too far, it can cause the MC to be actuated a little bit. If the pushrod is not out far enough, it will increase pedal travel. You shouldn't have to mess with this, but it's just something to know about.

Josh
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Old 05-26-2010, 04:02 PM   #3
Dobes
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Default

Hey alright, useful information on the intarweb!

Thanks for the info, especially concerning the push rod. You've given me confidence that this may actually be a reasonable upgrade I can do in a few hours. I'll have to fish around for some instructions before tearing into things.

Concerning the booster I was thinking about, it's off a mid-90's non-ABS equipped Impreza L. I actually gave it to a friend a few years ago when I sold my RS, but he's decided to not use it so I may be getting it back now.

JD
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Old 05-26-2010, 04:16 PM   #4
Dobes
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That didn't take long to find:



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Old 05-27-2010, 06:30 PM   #5
Kraziken
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I found this related thread. Works on Foresters, maybe doable in our cars?

http://www.subaruforester.org/vbulle...must-do-54112/
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Old 06-09-2010, 08:04 PM   #6
IT Swift
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Ok, you can have your precious booster back.
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Old 06-10-2010, 08:33 PM   #7
Dobes
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Quote:
Originally Posted by IT Swift View Post
Ok, you can have your precious booster back.
I just needed you to store it for half a decade or so. Sucker!
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