Date: Mon, 20 Mar 2000 18:33:06 -0500 From: Jeffrey Martynuska <jpmartynuskanopsams.com> Subject: Re: Front Brake Pads
I guess the obvious point wasn't so obvious, to me anyway. You mean the outer piston is supposed to *move*? Therein, I believe, lies the problem. Upon further investigation, the inner pistons do seem to be frozen. Looks like calipers are in order. This is my first brake job, on a SAAB, btw... Thanks for the help. I'll let you know what I find after I open them up. Jeff '86 900 Turbo Robert Brown wrote: > > Hi, > > Pls excuse what may be an obvious point, but are you checking to see that the > whole outer yoke can slide back and forth? Try the following tests, being > careful not to push the pistons too far outward: > > Push the piston for the inner pad into the housing, using a piece of wood as a > lever (careful not to damage the dust seals). The piston on the other side > (inboard) should push the yoke towards the car's centre line (as if to pull the > outer brake pad against the disk). > > You can check movement the other way by wedging a piece of wood between the > outer surface of the disk and the yoke (where the outer brake pad would sit) > and twist it to get the yoke to move towards the outside of the car. > > Once you've established that both brake pistons and the yoke move, then > installation of the pads should be easy. But it almost sounds as if the inner > piston (the one that drives the yoke towards the car's centre line) on your > brake is frozen. I've had that problem twice: once, because I was mucking > around too much and managed to drive the piston out too far; the other time, > because I hadn't changed my brake fluid in 5 years and the piston had rusted as > a result. > > I also have had the situation where the outer pad had worn down to nothing > (just the metal plate left) and this had caused the inner piston to hop out. I > pulled apart the brake, redid all seals, lubricated yoke contact points with > copper grease etc, refitted and bled hydraulics. Worked just like new. > > Again, excuse me if I'm stating too much of the obvious ;-) > > BTW I'm assuming that the 1986 brakes are Girlings (the same as on the 1983 > non-turbo). > > Tell us how it goes. > > Regards, > Robert > 1983 900 GL, 1999 9-3, 1983 99 GL (scrapped 1998) > >
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