Warping can be caused by:
- sudden temperature changes in the materials
- warn discs which have become too thin
- poor quality (Peugeot had this issue with their 505 series in the
eighties)
- very heavy braking with sudden blockage of the wheels
- combinations of above
How to fix:
- new disc is best get new pads as well as these have been worn to the disc
- have disk made flatened - this may help, but will get material from the
disc at irrelular spots of the disc (I hope it is said right...)
This possibly will cause unbalance of the disc, so new discs are the best
solution.
Good luck!
Cheers,
Hans
'71 BGT
-----Original Message-----
From: Eric [mailto:eric@erickson.on.net]
Sent: Monday, July 16, 2001 2:22 PM
To: MGs
Subject: Warped front discs
Guys,
After being told that one of my Rostyles could not be balanced because
it was 'warped' I wasn't surprised to feel a little 'pulsing' of the
brake pedale when lightly braking. But when this continued after
changing to my 'track' wheels I got a little concerned. At the moment
that 'pulsing' has become a steering wheel rattling shudder - but still
only under 'light' braking.
So I pulled the front wheels off again (changing back to my 'road'
wheels) but before I did I tried spinning each front wheel while it was
jacked up. The front right wheel spins OK (there may be a little
resistance in one spot, but only even slightly noticable if I rotate the
wheel ever so slowly and lightly).
The front right wheel is another story. A light spin will actually come
to a halt on a 'high spot'. With the wheel off and turning the hub by
hand I can really notice it. I think it goes beyond the "The Complete
Official MGB" manual statement of "the faces must run true to within a
total clock reading of .002in (.05mm)..."
Firstly, I think I had better get this seen to :-)
Secondly, what causes this... I can only guess that it is 'warping', so
I can try to prevent it happening again? Throwing the thing around a
racetrack couldn't do it, could it?
Please ... throw the newbie a bone!
Eric
'68MGB MkII
Adelaide, South Australia
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