NetNews Usenet Archive 1992 #19/NN_1992_19.iso/spool/rec/autos/tech/12051

Internet Message Format | 1992-09-01 | 1.8 KB

Path: sparky!uunet!munnari.oz.au!mel.dit.csiro.au!yarra!bohra.cpg.oz.au!jrp
From: [e-mail] (John Pitman)
Newsgroups: rec.autos.tech
Subject: disc brake rotors
Summary: disc brakes
Keywords: machining them
Message-ID: <[e-mail]>
Date: 1 Sep 92 23:31:27 GMT
Organization: Computer Power Software
Lines: 21

Hi there,
looking at a couple of the recent posts on disc brake rotors, the need to
machine them on pad replacement, i thought i'd put in my 2c worth. In the past
30 years of driving, most of it on discs, (mostly english cars) I have only
been sucked into rotor machining once, and then the rumbling problem was the
bloody pads breaking up anyway! All the other pad replacements I have done, I
have just pulled the old ones out and pushed the new ones in (with a clean of
the exposed piston surfaces before push back). sometimes they take a few days
to bed into the grooved surface of the disc. I have taken several cars to more
than 150000mls, several to 160000kms , usually replacing pads once a year at
least. And dont try to tell me they are harder/more $ to set up or build than
drums for the same stopping power!! The last big drum brake systems used (on
RR, ROver, MB etc) were power twin trailing shoe self adjusters that had to have
the new linings cut to the same radius as the newly machined drum (11" X " wide)
adjusted with a screw through the backplate to get the face of the lining
parallel to the drum face etc. this sort of stuff in a brake shop usually took
all day with all the right equipment at hand, and a guy who knew what he was
doing. any idiot with a few kidneys can shange disc pads ( well maybe gravy is
needed as well if the calipers are swinging with captive pads). The only hard
ones I know are those that incorporate hand brakes in a funny way!
jp