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- From: Frank.Mallory@f417.n109.z1.fidonet.org (Frank Mallory)
- Sender: Uucp@blkcat.UUCP
- Path: sparky!uunet!blkcat!Uucp
- Newsgroups: rec.autos.tech
- Subject: disc braks again
- Message-ID: <716618900.F00001@blkcat.UUCP>
- Date: Tue, 15 Sep 1992 09:27:55 -0500
- Lines: 18
-
- LB> This is correct (according to an article in _Machine Design_ #12 1992
- LB> reference issue). An added note: when the vehicle is moving forward
- LB> the servo action tends to engage the front shoe and disengage the back
- LB> shoe. And vice versa when going in reverse. My guess is this is why
- LB> the front shoe is typically larger than the back shoe (you do less
- LB> backing than forward, and reverse speeds are much lower than forward
- LB> speeds). Of course, just because the back shoe tends to be disengaged
- LB> doesn't mean it doesn't contribute toward the braking effort (it does).
-
- None of this was true for Mercedes. All shoes were the same size, but usually
- with different lining compounds on front vs rear (and at times, two different
- compounds on the same shoe). Front shoes were usually made from aluminum,
- whereas rear shoes were cast iron. Fronts always had two leading shoes, whereas
- rears had one leading and one trailing. Smaller diameter wheel cylinders were
- used on the rear.
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