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There are 3 things I know of used to ensure the brakes drag.
1 hardware, spring holders, nuts and bolts were added to calipers and pad backing to retract them. But the set up needed to be adjusted constantly.
2 On newer vehicles some engine vacuum is applied to the braking system some how to help remove brake drag from the rotor at highway speeds.
3 put properly functioning drum brakes all around.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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