W202 Brake vibration

[Benzsc1]

My fathers W202 2000 (W) 220CDI sport has had new discs and pads about 2 years ago since the brakes were changed its had a vibration when braking at any speed above 50MPH that got progressively worse to the point where I suggested changing the discs out again. This was done today new discs and pads and yet the vibration is still there???

Has anyone else experienced this or does anyone know if anything else could cause this vibration it only occurs when braking and is not evident at all under 50MPH or when driving along at any speed without touching the brakes which would normally suggest warped discs I am not really sure what else could cause this??.

Any help will be gratefully received.

Simon

 

[Benzsc1]

Thought i would bump this as I have the car here now and was hoping to get some suggestions its supposed to be going for MOT tomorrow I cant see that happening now so I will press on anyway.

It certainly is an odd fault I have thought about wornwheel bearings buckled alloys or hubs but all that would normally manifest itself in a different way if faulty......and otherwise seem faultless.

Propshaft doughnut??? again that normally causes issues during normal driving if faulty.

Thanks in advance.

Si

 

[BlackC55]

Did you change the rear dics and pads too?

 

[Benzsc1]

I swapped them about 1 year ago genuine items i even returned the set to the main dealer and got another set it still didn't cure it the fronts were changed a year before with genuine items. (Its a long story about the tardy diagnosis the car is not driven often) and hence they have been replaced again in an attempt to rid the vibration.

Its baffling me to be honest

 

[BlackC55]

You need to check the suspension properly and the discs. The discs must be free of corrosion on both sides.

 

[Benzsc1]

I am confident at this point the discs are not causing the fault. As you say I think its time to start checking the suspension bushes and general condition.

Its so wierd cause the car feels solid when driving even at speed its only when you touch the brakes above 50 mph you get the vibration it dissappears under 50 mph and its definitley not an ABS type vibration in my experiencve any technical proffesional who drives this car would in the first instance diagnose warpped discs I reckon, its that type of vibration you feel it through the brake pedal and the steering wheel not to mention the base of the seat.....

I will keep you posted

 

[Benzsc1]

Bumped

Any other suggestions?

Regards

Si

 

[GordonTarling]

You need to remove each wheel in turn and check the disk runout in situ with a dial test indicator - that'll show if you have a disk problem. My money is on one or both of the frontdisks either warped or incorrectly fitted.

 

[DRBC43AMG]

I think your problem is brake related, but have you checked the steering shock absorber??

 

[NW_Merc]

I think your problem is brake related, but have you checked the steering shock absorber??

Is that also known as the steering damper?

 

[DRBC43AMG]

Yes....

 

[Benzsc1]

The discs have all been changed I really cannot see at this point after returning sets of discs to Mercedes and GSF that it is the discs causing the issue.

Ah the steering damper I havent checked that will give it a go thanks......

Well I guess failing that the next step is to get under the car and check every single suspension bush.......

 

[vijilants]

Id get your wheels checked on a balancing machine to make sure that they are not warped or buckled.

 

[Will]

Check the wheel bearings for excessive free-play. I had quite a bit on an old W202 of mine and slight play in my 208 CLK55 (same setup) which was giving noticable vibration under braking at speed.

Grab hold of the wheel whilst jacked up at 12 an 6 o'clock and check for any movement - there should be none. I think the spec is something silly like 0.01mm of free play so if you can feel any movement by hand it's far too much!

 

[Benzsc1]

Cheers Will already checked the front bearings re-greased and adjusted with no play felt when checked and the wheel spinning nice and freely

The wheels are another area I should have re-checked at this point.

 

[NW_Merc]

Cheers Will already checked the front bearings re-greased and adjusted with no play felt when checked and the wheel spinning nice and freely

The wheels are another area I should have re-checked at this point.

Did you do that using just a jack and stands?

 

[Benzsc1]

No I used a hydraulic ramp . Why would using either or make a difference?