Date: Thu, 07 Feb 2002 22:57:45 +0100
From: Robert Brown <>
Subject: Re: Need Help with '84 900 Front Brake Problem

Bruce wrote: > I'm hoping that someone here can help me with a problem with my Non- > Turbo '84 900 Coupe. > > Symptom: > Severe front end vibration and rat-tat-tat sound when applying > brakes while backing up. Brakes are normal while driving forward. > > Please respond to this group. > It's possible to get this symptom when a lot of play has developed between the yoke and the cylinder housing. The 1984 - and probably everything between 1979 and 1986 (IIRC) - uses the old Girling brakes, cheap and nasty design but they work well - for a while. The sliding surfaces on the yoke are sufficiently exposed to the elements that road grit will wear them away after about 10 years or so. You can test for this play by pulling the yoke upwards then downwards to see if there's significant movement (more than about 1,5 - 2 mm). If you get play, then that may be what you're hearing when you reverse then brake. The reason you wouldn't get this when braking after moving *forward* is that the yoke will have already settled in the lowest possible position. Reversing then braking will have the effect of pushing the yoke (holding the outer pad) upwards, where there will be room to move, and then go "clunk" one or several times. Could this be your problem? If so, you can get shims welded in, but it's hard to do it without causing the yoke to bind on the cyl housing afterwards. Better to go out and buy reconditioned complete front brakes - In Sweden they cost the equiv of about USD 80 each if you trade in the old ones after the refit (remember to look for and dig out the circlip holding the handbrake cable outer to the yoke, on its front surface, when removing the old ones. There's so much rust and road gunk that collects there, that many first-timers (if you are indeed one) fail to see them ;-) Tell us what the problem turned out to be. Regards, Robert (once owned and spent half my life under 1983 99 GL, 1983 900 GL)

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