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    Balance problem with upgraded brakes

    I have a '71 2800CS that has 3.0CS brakes (vented discs front and rear with rear 3.0 semi-trailing arms). Although the hydraulic system doesn’t leak since I rebuilt the calipers, I have poor balance with much less braking in the rear than expected. I suspect that either the proportioning valve is defective or the master cylinder is either defective or incorrect. I don't know anything about the replacement history of the current master cylinder.

    Can the master cylinder be identified by external characteristics? Will using a 2800CS disc/drum brake master cylinder with the 4-wheel disc brake system cause this brake imbalance?

    Could this problem be caused by a defective proportioning valve? Can the brake proportioning valve be cleaned or rebuilt?

    Thanks.

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    Re: Balance problem with upgraded brakes

    If it was my car, I would switch to either the 3.0CS master cylinder or one from an E12 5 series or early 6 series.

    I've never heard of a proportioning valve going bad.

    When you did the conversion, did you replace the rubber brake lines. They swell internally with age and cause odd problems.


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