Date: Sat, 1 May 1999 01:36:23 +0200 From: "Torben Schiff" <schiffnopsam.mira.dk> Subject: Re: SKWEEEEEK! Help with noisy brakes
Hi 'arry! You'll have to fit new brakepads to the front calipers. The problem is caused by a very hard surface on the pads, and will only go away if you refit these. Originally the pads come in two different packages: Two inner brakepads and two outer brakepads. The ones on the outer side are much softer than the ones on the inner side hence the braking pressure on the outer side decreases due to friction in the caliper construction. Mainly this problem about noisy brakes is caused by an overheating of the discs. This again could be caused by hard driving or too thin discs. (They will not be able to carry away the heat caused by braking the car). Check the disk thickness to be sure they're not too thin. The measure should be at least 18,9 mm. New ones are 20,0 mm. thick since it's a turbo model with ventilated discs! After the fitting of new pads you'll have to drive very, very carefully not to harden the surface of the pads up. Let's say, that you drive at least 300 km, before applying maximum brake pressure. At this point the pads will be worn to fit the old discs, and they will now be able to transport a maximum of heat to the discs during the brake session. Good luck to you! Regards, Torben Schiff 'arry skrev i meddelelsen <372a1f33.972012nopsam.cwcom.net>... >Please help before my wife's brother drives me mad with the (front) >brakes on his '87 900 Turbo. > >They squeal (a lot) whenever the pads have warmed up. It gets so that >he trys not to brake at all in built up areas because of the strange >looks he keeps getting. > >We've tried the following: > >Cleaning up disks and calipers with brake cleaner. >Chamfering the leading edges of his pads >Using copper grease on the pad backs and calipers >Trying Bendix anti squeal on the pads >Cutting a slot down the centre of the pads > >The pads are of unknown make (maybe Saab parts, maybe not) and not >worn. Are certain makes of pad better or worse in this respect? > >Any ideas? > >Thanks >'arry
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