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Old 05-13-2011, 03:54 PM   #1
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How can I soften a spring rate?


I have some after market disk brakes on the back wheels of my truck and the return spring for them is made for a car that has a foot actuated e-brake and mine is an old Toyota pull handle under the dash.

How can I soften the spring so I can set the brake and not feel like I'm trying to pull a semi truck down the road with by hand?

Do I heat them up and just let them cool? I don't want to cut them because I need the full spring height so they fit properly (and they'll still be too stiff anyways).

TIA

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Old 05-14-2011, 08:16 PM   #2
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How can I soften a spring rate?


if you cut a spring, for the same length it will still have to work through, you'll make it STRONGER.

you can anneal them.

http://www.efunda.com/processes/heat.../annealing.cfm

i am not sure to what specific hardness yours supposed to be. back from my tool maker times, we kept springs at about 50 Rockwell. springs are made out of special spring steel. they were brought up to about 870 C and dropped into room temperature oil. annealed to dark brown.

this is what i am referring to:

Stress Relief Annealing
Stress Relief Anneal is used to reduce residual stresses in large castings, welded parts and cold-formed parts. Such parts tend to have stresses due to thermal cycling or work hardening. Parts are heated to temperatures of up to 600 - 650 C (1112 - 1202 F), and held for an extended time (about 1 hour or more) and then slowly cooled in still air.

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