Help!!!!!!!!!!!!! I've had my '96 993 c2 for approx 8 months now, and had a bloody annoying judder from the rear of the car for most of that time. I am now nearing the end of my patience and want the problem sorted. The background: Bought the car from a Lexus garage, they replaced the rear discs but with non-OE parts. Drive for approx 1,000 miles then notice a juddering sound and feel coming from the rear of the car, this appears to get worse when the brakes are warmed up and is only really noticeable above, say 70 mph. Take the car back to the garage, they skim the discs and everything is OK for a few hundred miles. Then the problem comes back, I get angry and demand new discs, they oblige but again with the non-OE parts again. I am less than happy and voice my concerns, but go along in the knowledge that they will provide OE discs if the same happens again. The same does happen approx 1200 miles later. I then - very frustrated - take the car to local Porsche Indie, who says the pads are low and look as though they are not set properly. He replaces pads all round (calliper plates are apparantly OK and not rusty) thinking that this could be source of problem. I pick the car up and he says he has tested it and its sorted. I drive it away dial up 85 mph, brake, and there is the juddering.
Now I'm sick and go back to Lexus demanding OE discs for the rear. They then oblige and provide two lovely grey painted OE discs. These are fitted and it seems to cure the problem. That was until Saturday when I noticed the problem coming back again. Now it is just as bad as before.
A couple of points: I have always felt that the car suffered a slight 'wobbling' at higher speeds from the rear. On smooth roads it feels almost like the rear wheels are out of balance and when the brakes are applied, it accentuates the wobbling to create the judder through the pedal and my arse. Most people don't seem to notice the 'wobbling' when I tell them but I know it is there. In the course of the various investigations, the wheels have been off and balanced, then stripped down and re-lacquered. I have also recently replaced the rear tyres, so its not some form of tyre abnormality.
I am struggling to believe that the discs are the problem. The last 1200 miles I have done I have not been hard on the brakes, in fact a lot of the miles have been motorway and I've been bedding them in. The most confusing thing however is that when the discs have been replaced, the problem is cured for a while. If it wasn't the discs then surely the problem would be there even when the new discs were put on. Unless of course something is working loose that is subsequently tightened up when the discs are replaced. In which case, should I get someone to take the discs off, then put them back on again to see if that makes a difference??? The problem is that I am really grasping at straws because I don't know enough about it. My dad is wondering whetrher it could be play in the bearings, or imperfection in the hub (but then why would it be OK for 1200 miles??), but again, we don't know, and neither does my mechanic mate who has two 911s and works on them a fair bit. The indie I took it to doesn't know, Lexus don't know - nobody seems to know!!
As you may have guessed, this post is borne out of sheer desperation and I appeal to all you people out there who know these cars like the back of your hands, to share some thoughts as to what it could be. I hope I have explained it enough but please tell me if it isn't clear. Many thanks in anticipation.
Adam
Migration info. Legacy thread was 20081
Now I'm sick and go back to Lexus demanding OE discs for the rear. They then oblige and provide two lovely grey painted OE discs. These are fitted and it seems to cure the problem. That was until Saturday when I noticed the problem coming back again. Now it is just as bad as before.
A couple of points: I have always felt that the car suffered a slight 'wobbling' at higher speeds from the rear. On smooth roads it feels almost like the rear wheels are out of balance and when the brakes are applied, it accentuates the wobbling to create the judder through the pedal and my arse. Most people don't seem to notice the 'wobbling' when I tell them but I know it is there. In the course of the various investigations, the wheels have been off and balanced, then stripped down and re-lacquered. I have also recently replaced the rear tyres, so its not some form of tyre abnormality.
I am struggling to believe that the discs are the problem. The last 1200 miles I have done I have not been hard on the brakes, in fact a lot of the miles have been motorway and I've been bedding them in. The most confusing thing however is that when the discs have been replaced, the problem is cured for a while. If it wasn't the discs then surely the problem would be there even when the new discs were put on. Unless of course something is working loose that is subsequently tightened up when the discs are replaced. In which case, should I get someone to take the discs off, then put them back on again to see if that makes a difference??? The problem is that I am really grasping at straws because I don't know enough about it. My dad is wondering whetrher it could be play in the bearings, or imperfection in the hub (but then why would it be OK for 1200 miles??), but again, we don't know, and neither does my mechanic mate who has two 911s and works on them a fair bit. The indie I took it to doesn't know, Lexus don't know - nobody seems to know!!
As you may have guessed, this post is borne out of sheer desperation and I appeal to all you people out there who know these cars like the back of your hands, to share some thoughts as to what it could be. I hope I have explained it enough but please tell me if it isn't clear. Many thanks in anticipation.
Adam
Migration info. Legacy thread was 20081
