Brake drag and booster/MC rod adjustment

[Sheepdip]

Originally Posted by weq92f

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I've read quite a few threads on here today about dragging/locking front brakes. What I've gleaned from the discussions tells me a potential cause is the rod length which can restrict the MC piston from releasing 100%. I replaced the calipers and hoses because the dragging is a recent development after many miles on the installed components and figured the rod must be right.

Now they lock up and stay that way. So I released pressure at all points starting at caliper -> PV out(front) -> PV in(front) -> MC out front, one at a time each time locking the brakes back up with some pedal pump. Each point releases pressure to both front calipers. So...the problem is the MC...right?

One more test...lock brakes and unbolt the MC from the booster. That unlocks both calipers too.

Pedal rod into the booster or the booster pushrod need adjusting to reduce the MC preload. Can you guys help me understand how to do that?


-Kevin

See diagram on post #80..... http://www.67-72chevytrucks.com/vboa...61#post9306361