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  1. More vacuum or front bias?

    Suspension - Brakes - Steering
    I have 4 wheel disks on my 68 Firebird but can't lock up the brakes. It stops ok, better when have some speed or first hit the brakes. But best case the passenger rear will lock up a little. New master cylinder and vacuum booster, stock automatic proportioning valve. 383 doesn't make much vacuum...