Re: Brakes Springs on a 47 Packard

Posted by jfrom@kanter On 2015/5/15 8:49:27

The orange/yellow springs were used since at least 1940 on the senior 160/180's right through 56 seniors.

The aftermarket part #'s were #120 primary orange and #122 secondary yellow. Aftermarket also offered a "heavy duty "setup of both springs #122/yellow. Our spring supplier produces those springs in gray, thus ours is a heavy duty setup. It seems that the longstanding practice of short primary linings/long secondary, different lining composition for primary/secondary and different spring tension for primary/secondary has been found to be in question, thus the changes.

There are comments on which spring should be installed first, the justification being that a service manual or other photo shows one spring below the other. a case of a "rule" being made from an observation , they can be installed either way, no difference.

About pinching the open spring end to make it parallel, no service manual justification or any in Chilton or other manual. The springs have lots of tension; they will not "jump" off.

Thanks
James
Kanter Auto Products