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Date: Mon, 08 Jul 2002 09:04:46 +0100
From: Grunff <>
Subject: Re: 86Saab 900S brakes

Hal Selvey wrote: > My son has an 86 model 900S which needs a front brake job (rear to come > soon.) It has disk brakes all around. > > I can't get the caliper pistons to retract enough to get new pads in. > As a matter of fact, I'm not sure I've gotten them to retract at all > except I can get the old pads out. > > Is there a trick to this? I can't get enough clearance to get a C-clamp > on the primary piston. Prying against the disk doesn't result in any > movement of either piston. Opening the bleeder valve doesn't help; it > just drains the master cylinder. Are the rusted in place maybe? Do I > need to dismount the calipers? I have a Haynes manual, and it isn't any > help at all. You must never force the pistons back - the way to retract them is by screwing them in. Look at the piston face, you'll see 4 dimples in a square. There's a special tool which fits into them, which you use to turn the piston clockwise. It's easy enough to make the tool from a strip of steel and two screws, but they're pretty cheap from any Saab garage. If you're in a hury, and can't make/buy one, a pair of bent circlip pliers will just about do. -- Grunff

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