[my66malibu]

installed front disc brakes on car. ran new brake lines in front. old line from master had loop in it. new master. do my new lines need loop anywhere? thanks

 

[Olle]

I don't know exactly why the loops are there, but I guess it's for two reasons: They will be easier to bend to fit when you connect them, and it adds some flexibility to the lines. I looped my lines for those two reasons, but I have seen many cars without them. I would say that they are flexible enough the way they are run on the firewall, so I don't think it's absolutely necessary.

 

[vrooom3440]

It depends...

The loops do provide some degree of flexibility to the brake lines that would not be there otherwise. This can be useful for removal of the lines. It can be useful to match up where the line is with where the master cylinder attachment is. It can also be useful as lines cross different attachment domains. What I mean by that is the body is one domain and the frame is another. These two domains can move relative to each other and anything that crosses from one to the other needs to take that movement into account.

This may or may not apply here specifically, but is worth considering. I would point out an example here is the rubber line between fuel tank sender (basically body mounted) and frame mounted steel fuel line.

 

[Army30]

the loops are just there for vibration purposes

 

[M.Maner]

Actually the loops are there to allow for the small amount of movement that exist between the chassis and the body.