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Old 14th March 2011, 13:53   #1
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Default Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Hello all,

I have this weird problem where the steering starts to wobble when braking at 30km/h + speeds. The wheels have been aligned very recently, so there is no chance for the wheels being the culprit.

The front discs have been changed twice in 5 months(skimming has been done twice).

The problem was reported to the service engineer, The problem disappeared after the disks were changed but the problem crept back after 300-400Kms/1month of driving in Bangalore.

Also, The front left suspension makes kit-kit sort of noise whenever i'm turning or driven on a rough patch of the road, The problem was solved after the service engineer welded a "cracked plate". But the problem is back again.

Technical gurus please help me out :(

P.S- The engineer claims that the suspensions are healthy, there are no signs of leakages and cracks and all the bushes/bearing are fine.

Last edited by akshay_b : 14th March 2011 at 13:55.
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Old 14th March 2011, 14:03   #2
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

How much has your car run? Have your rims checked for any deformation

Do you get any grinding noise when your apply brakes?
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Old 14th March 2011, 15:14   #3
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

My car has clocked 20k on the ODO, I just hear the normal brushing sound when applying the breaks.
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Old 14th March 2011, 16:14   #4
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Seems like a case of "Low speed shimmy". The wheel hub + rotor disc assembly must be also balanced, if you replace with a new disc every time this may not solve it, are you sure you are replacing the rotor disc and not the pads?

Check for "runouts" (radial / lateral) of the assemblies and ascertain if they are within the limits.

Spike
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Old 14th March 2011, 16:14   #5
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by akshay_b View Post
My car has clocked 20k on the ODO, I just hear the normal brushing sound when applying the breaks.
Changing the brake discs/skimming twice in a span of just 5 months is something that's not normal.
Why did you have to do that? Did the ASC give you a proper reason?
Did they change the brake pads then?
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Old 14th March 2011, 16:55   #6
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

1) Does your steering wheel feel free while rotating before the tyres actually turn? If so please do also check the tie rod ends

2) Wobble in the wheel could also mean that your hub bearing is faulty and your wheels need balancing
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Old 14th March 2011, 18:08   #7
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by SPIKE ARRESTOR View Post
Seems like a case of "Low speed shimmy". The wheel hub + rotor disc assembly must be also balanced, if you replace with a new disc every time this may not solve it, are you sure you are replacing the rotor disc and not the pads?

Check for "runouts" (radial / lateral) of the assemblies and ascertain if they are within the limits.

Spike
I think so too, May be it needs wheel hub balancing. And yes the rotor disc plates have been replaced and skimmed, The pads are doing fine.

Quote:
Originally Posted by jeeva View Post
Changing the brake discs/skimming twice in a span of just 5 months is something that's not normal.
Why did you have to do that? Did the ASC give you a proper reason?
Did they change the brake pads then?
The ASC told me that there are many reasons for the disks to get damaged, I thought that the disks are being bent due to the "kit-kit" noise from the F-L suspension, I thought that the disks will not be damaged again after the suspension repair. Brake pads weren't changed.

Quote:
Originally Posted by Psycho View Post
1) Does your steering wheel feel free while rotating before the tyres actually turn? If so please do also check the tie rod ends

2) Wobble in the wheel could also mean that your hub bearing is faulty and your wheels need balancing
I need to check this, Wheels have been balanced last month.
I suspect the wheel hub to be the culprit.
Any idea about the "kit-kit" noise when turning?

The service manager is a highly qualified and an experienced man, do you guys want me to point out a particular part to be checked?
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Old 15th March 2011, 11:35   #8
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

One sec does the car have abs if so a vibrating steering makes sense and the kit kit sound could be the abs pump. As for the wobble i still would think bearings and tie rod end.
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Old 15th March 2011, 11:42   #9
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Try a disc AND pad change.
New pads align to new discs, hence.
If the last rotor change is fairly recent, get it checked to see if its ok, and just do a pad change, before looking anywhere else.
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Old 15th March 2011, 13:31   #10
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by akshay_b View Post
I have this weird problem where the steering starts to wobble when braking at 30km/h + speeds.
Quote:
Originally Posted by SPIKE ARRESTOR View Post
Seems like a case of "Low speed shimmy".
Agree with Spike - too many factors apart from disc warpage, to cause low speed shimmy on braking.

For starters, do a complete swap of all your tyres from another car without any problems, and check if the wobble continues.
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Old 15th March 2011, 17:01   #11
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by Psycho View Post
One sec does the car have abs if so a vibrating steering makes sense and the kit kit sound could be the abs pump. As for the wobble i still would think bearings and tie rod end.
No, This is without ABS, And i will mention the bearings and tie rod end to the service manager. Thanks


Quote:
Originally Posted by mayankk View Post
Try a disc AND pad change.
New pads align to new discs, hence.
If the last rotor change is fairly recent, get it checked to see if its ok, and just do a pad change, before looking anywhere else.
I am pretty sure that the discs are bent again and that's why the wobble, I'll ask the manager to check the pads too.

Quote:
Originally Posted by SS-Traveller View Post
Agree with Spike - too many factors apart from disc warpage, to cause low speed shimmy on braking.

For starters, do a complete swap of all your tyres from another car without any problems, and check if the wobble continues.
How about installing the rear tires to the front and vice versa?
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Old 15th March 2011, 19:39   #12
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by akshay_b View Post
How about installing the rear tires to the front and vice versa?
Try that if you can't borrow someone else's tyres for a few minutes.

Incidentally, did you have any accidental damage to the front suspension, before this problem started?
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Old 16th March 2011, 10:22   #13
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by SS-Traveller View Post
Try that if you can't borrow someone else's tyres for a few minutes.

Incidentally, did you have any accidental damage to the front suspension, before this problem started?
Changing tires for a few minutes wont help, I am pretty sure that the rotor disc are bent, may be i should get the discs fixed and change the tires.

And nothing major has happened but i have run over pot holes at good speeds long back. But i dont think that could be the reason.
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Old 16th March 2011, 10:56   #14
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by akshay_b View Post
Changing tires for a few minutes wont help...
The steering wobble on braking could be because of internal damage to the tyre cords/belting which is not visible outside. The tyre swap is to check if the wobble/shimmy goes away without touching the discs.
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Old 16th March 2011, 17:49   #15
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Default Re: Disc plates changed 4 times in 5 months(Steering wobbling)- Santro Xing.

Quote:
Originally Posted by SS-Traveller View Post
The steering wobble on braking could be because of internal damage to the tyre cords/belting which is not visible outside. The tyre swap is to check if the wobble/shimmy goes away without touching the discs.
All these days, The wobbling used to go away only when the discs were changed, And it starts again after 500-600kms
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