Date: Sat, 08 Apr 2006 21:05:32 +0100 From: "Charles C." <c.k.christacopoulos.removeme.nospamee.ac.uk> Subject: Re: C900 front calliper clonk
Craig's Saab C900 Site wrote: > "Al" <alistairdorenospamo.com> writes: > >> OK I have the classic clonk on my front callipers when I stop and >> reverse up and stop again. I know it's a "feature" of the C900 but >> it's getting worse. > >> What exactly is worn, and is it worth spending well over =A3100 to get >> it fixed. My specialists did the brakes for me recently as part of the >> MOT work, and the clonk was gone, but 3 months later it's gradually >> returned and is worse than ever. > > If you take off one of the front wheels and look at the caliper, you'll see > that there is a u-clamp holding a strangely-shaped spring against the > backing plate of each of the brake pads and there is also a wire 'butterfly' > spring as well. I've got a pic at this URL: > > http://www.classicsaab.net/gallery2/main.php?g2_view=core.ShowItem&g2_itemId=598 > > which, if you look past all the cobwebs (!), shows the u-clamp, and the main > spring. The 'butterfly' spring isn't really clear but it's there too. > > Those components are designed to prevent or at least reduce that 'clonk' > that you get. The kits to replace those components are low in price from > places like Parts for Saabs, etc. and it's a very cheap way to help overcome > the clonking. The spring you ought to refer to ... is what in your photo is on the extreme right of the caliper and is shaped like a U. That fits (if I remember correctly) between yoke and caliper and stops the lateral movement. The clonk is mainly produced by vertical movement and the only correct way of reducing it is to rebuilt the missing metal. I've heard those parts called 'anti-rattle' components as > well. > > I've been told, but have not really proven, that if you replace the brake > pads with new ones the clonking isn't as bad, but that's probably more > related to overall wear of the brake caliper components and how well > lubricated the sliding yoke of the caliper is. A bit of both ... new pads might help, fitting new pads means lubricating everything etc. > Regards, > > Craig. -- Please remove _removeme_ to reply.
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