Results 1 to 1 of 1
-
07 May 2019 #1
- Join Date
- 07 May 2019
- Location
- Tucson, AZ
- Posts
- 1
- Saab(s)
- 2009 9-3 Wagon
Steering vibration under braking
I had a steering wheel vibration under braking that became rapidly worse over the last 5000 miles or so, to the point that moderate braking from freeway speeds became an alarming experience. I know this problem has been encountered by many others, and there are a lot of threads on it, but I haven't previously seen the solution that I discovered.
Having replaced the front rotors and pads quite recently, my initial suspicion fell on the brakes themselves. I removed both front calipers and checked the pad and rotor surfaces for any anomalies and found nothing - no cracks, normal even wear. I checked runout of both inner and outer surfaces and found everything 0.001" or less. As a result of a friend's suggestion that it could be suspension related, I suddenly realized while looking at the suspension that the torque under braking tries to rotate the suspension in such a way that caster is lessened. The Saab doesn't have much to begin with - 3 degrees - so I began to wonder if the vibration didn't have anything to do with the brakes themselves, but was due to a sloppy suspension mount allowing the caster to reduce to the point that the front wheels become unstable. Easy enough to test this one. So I torqued all the suspension fasteners (there are a lot of them!) to spec, and test drove. Problem solved!
2009 Saab 9-3 wagon, 79K miles
Similar Threads
-
No braking power / loose brake pedal
By Naizz in forum Saab 9-5 (1998-2009)Replies: 16Last Post: 28 June 2017, 20:40 -
2007 93 T - Steering wheel/Break pedal/Seat overall feel vibration
By Langerdoo in forum Saab 9-3 (2003-2014)Replies: 4Last Post: 07 March 2017, 11:37 -
can't get rid of the vibration...
By Saab900s in forum Saab 900 (1979-1994)Replies: 3Last Post: 02 May 2016, 08:13 -
Intermittent Loss of Brake Pressure and Actual Braking - 1996 900 SE
By Shazam in forum Saab 900 and 9-3 (1994-2003)Replies: 4Last Post: 16 January 2013, 13:26 -
Engine Braking w/ignition off
By nuclear944 in forum Tech TalkReplies: 9Last Post: 08 February 2012, 01:16