Got 68' Malibu I bought new master cylinder and brake booster.question is about brake lines.new master cylinder has bracket that angles it up maybe 15 deg. old lines that spiral 3 to 4 times down to perportioning valve is to short even stretching it.Is there reasoning for the spiral or can I just fab new lines,and do I need to match the spirals.
wdavenport
The reasoning behind the spiral is to make sure the brake lines are not under tension or compression when the frame/body/firewall flexes. There are different way they were done depending on model (I guess the stiffer the body, the less «spring» you need). As long as you have some bending allowed, you should be OK. Here are some designs:
The coil spring (F-body 68):
![Image]()
The single loop:
![Image]()
The horizontal lever arm (A-body 69; This is what you should have on your car with power brake):
![Image]()
The S-shape (Bonneville 67):
![Image]()
The coil spring (F-body 68):
The single loop:
The horizontal lever arm (A-body 69; This is what you should have on your car with power brake):
The S-shape (Bonneville 67):
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