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Bummed out - disk turning story 444-544

posted by  Belinda on  Sat Apr 21 11:34 CST 2007
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last visit: Sat Aug 24 08:25 CST 2013
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Well, I have waited all year for the weather to get nice so I could finish my disk brake conversion project. This weekend was it.

Since the brakes were shaking pretty badly on the last test drive (after the install), we figured all we needed to do was turn them.

Before turning, the runouts were approximately:
DS -2 thousandths to 1 thou
PS -6 thousandths to 2?

The hubs were snugged up against the disks, and we took them to the shop. At first, the guy at the counter said "Steel...hmmm. There was a guy in here earlier with jaguar steel disks and we couldn't turn them. The material just shaves off and the finish ended up looking like a phonograph."

My boyfriend talked the guy into "just try these, feed the machine real slow..."

Well anyway, we returned in about an hour after lunch. They were finishing up, and the good news is they were able to turn them without making them into records. The bad news:

After turning the runouts are now:

DS -5 thousandths to 0 thousandths
PS -5 thousandths to 1

(These are the numbers on one face, the opposite face is pretty much high to the same degree as this side is low, and vice versa - so they are consistent, but not running parallel to the spindle).

So it appears this just made things worse.

Anybody have any ideas how to get rid of the shake in the front end upon hard braking? Is turning the disks to a tighter tolerance the answer, or are we overlooking something? We are thinking about trying to turn them ourselves. I guess we could try Napa too (this was a local Mom & Pop shop).

Belinda






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