1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Rear drum to disc brake swap - what about brake bias

Old 05-04-02, 01:54 PM
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Rear drum to disc brake swap - what about brake bias

Today, I picked up a rear end out of an 85 GSL and I want to swap pretty soon. When I add the disc brake rearend I think that I will change my front to rear brake bias.

How much of a change will this be and what is the easiest way to correct this.

I have a proportioning vale that I can add or I can get the master cyclender from the GSL.

Suggestions? Thanks ~ JEB
Old 05-04-02, 02:53 PM
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I'm doing the exact same swap as you. Get yerself a master cylinder from a GSL and you should be good. I don't know how your rear looked but mine terribly rusted. I did a POR-15 paint job on it and now it's looks as good as new.
Old 05-04-02, 02:55 PM
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Before.....

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Old 05-04-02, 03:00 PM
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After.......

Old 05-04-02, 03:06 PM
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errr

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Old 05-04-02, 03:13 PM
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Nice red crosses.
Old 05-04-02, 03:20 PM
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Originally posted by Aico
Nice red crosses.
huh?
Old 05-04-02, 04:33 PM
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Don't worry Aico, I got it, and it was funny.
Old 05-04-02, 06:34 PM
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How much did you get that GSL rear for?
Old 05-04-02, 06:51 PM
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I got this one from a pick-a-part place for $169. I could have just goten the 3rd member for $69. The last one I got from a friend for $150.
Old 05-04-02, 09:07 PM
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Yup, sounds about right, got mine for $150 + tax
Old 05-04-02, 10:31 PM
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Originally posted by Redwood
Don't worry Aico, I got it, and it was funny.
LOL I got it too.
Old 05-04-02, 10:43 PM
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Exclamation Don't forget the proportion valve!!

If you were swaping'82-82 or earlier, you'd be fine. But '83 and later proportion valve is a different part number between disc and drum.

I think what happened is in 1983 the increased the size of the power assist unit.

Old 05-04-02, 11:43 PM
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Be sure to use organic pads in the rear, not metal. The squeal from the metal will drive you mad.
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