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Author Subject: Brake wobble but not warped disc?
demondriverdan

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Post #1
Had the track car out at Brands yesterday and had an issue with the brakes. When cold the brakes were fine, obviously only using gentle pressure to bring them up to temperature. When hot though there was an issue with the steering wheel wobbling.

On light and medium brake pressure the steering wheel would wobble horrendously however when on full or hard braking they were absolutely fine.

Initially thought it might have been the ABS going berserk but that didn't really explain why it went away on full braking.

When using the old brake set we had a similar issue that we put down to the discs being warped. Unlikely that both sets of discs are warped though?

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Posted 21st Aug 2013 at 11:37
welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #2
Balljoint issue somewhere is possible

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Posted 21st Aug 2013 at 13:19
demondriverdan

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Post #3
Lose balljoint causing the wobbling? It's an unusual issue especially since we've had a similar problem with both sets of brakes.

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Rallye Race Car
Posted 21st Aug 2013 at 13:31
welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #4
could be a damaged drive flange too.

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Posted 21st Aug 2013 at 14:27
demondriverdan

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Post #5
Drive flange being something to do with the hub? Not sure what you mean

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Posted 21st Aug 2013 at 15:53
welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #6
its the bit the CV joint is bolted into, pressed into the wheel bearing, the flange that does the driving of the wheel...

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Posted 21st Aug 2013 at 16:03
mechanical_repairs

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Post #7
Had this the other month on a customers car, replaced the two front drive flanges and the problem has not come back, Thumbs up


Carl

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Posted 21st Aug 2013 at 19:12
demondriverdan

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Post #8
Ok, I'm still being a bit of an idiot and can't figure out which part you're talking about with the flange Sad I've never taken the driveshafts / hubs apart before so can't picture it.

I've checked service box but still not sure which bit, have you got a picture / diagram of it?

Really sorry guys, appreciate all the help!

EDIT: Similar to this bit? http://peugeot-206.sgpetch.co.uk/pages/parts/detail/category=chassis/engine=288/part=4456

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Rallye Race Car
Posted 21st Aug 2013 at 20:07
scotzman

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Post #9
That's it

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Posted 21st Aug 2013 at 20:13
mechanical_repairs

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Post #10
I can get them a lot cheaper than that to should you be after a pair?

Carl

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36 narborough road south, Leicester LE3 2fn

MOT station now open, tests £35 with a free retest.
Recovery available with a recovery unit, for those not so local jobs

Also offer the loan of a free courtesy car 306 dturbo
Posted 21st Aug 2013 at 21:39
welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Posted 21st Aug 2013 at 21:49
welshpug!

Capt Pedantic

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Post #12
before you go swapping these though, get a dti gauge on it and see what the runout is like, do the same with the disc.

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Posted 21st Aug 2013 at 21:50
buzzbrightyear

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Post #13
What would cause these to be damaged?

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Posted 21st Aug 2013 at 21:51
phillipm

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Post #14
Corrosion, kerb impacts, loose wheelbolts causing surface fretting, sometimes overheating if a bearing has been going before being caught.

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Posted 21st Aug 2013 at 21:54
welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #15
oh and you'll need wheel bearings, found my local factors very competitively priced for bits like this, especially if you get trade.

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Posted 21st Aug 2013 at 21:54
demondriverdan

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Post #16
welshpug! wrote:
before you go swapping these though, get a dti gauge on it and see what the runout is like, do the same with the disc.


Could you explain this a bit more? What do you mean by runout?

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Rallye Race Car
Posted 21st Aug 2013 at 22:55
phillipm

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Post #17
See if it wobbles...

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Posted 22nd Aug 2013 at 01:12
jimmyhackers

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Post #18
have the discs been bedded in properly?

couldnt a burn spot half from incorrect bedding be etched into a disc surface and start rearing its ugly head once the disc is upto operating tempreture?

as a track car you get the brakes pretty hot whenever you use it i guess. so this could happen more easily than it would one a road car.

not sure it rebedding the discs will fix this????

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Posted 22nd Aug 2013 at 01:51
adam b

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Post #19
It would happen all the time then Jimmy.

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Posted 22nd Aug 2013 at 08:07
demondriverdan

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Post #20
Our reasoning that it's not the discs is that it did it on 2 different brake setups so either both sets had not been bedded in properly (bought both used) or there's another issue.

Think I've got an idea on how to test the runout

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Rallye Race Car
Posted 22nd Aug 2013 at 09:09
armzsc6

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Post #21
More than likely is warped discs to be honest. If it was the hub it would be all the time. Discs don't just get warped by not being bedded in correctly thy also get warped by over heating, seized callipers or stuck pads, sitting with your foot on the brake once they are warm also creates hot spots and warps them. If you bought them second hand then their probably f**ked.

The gti brakes I have on my hdi do the same thing it's only once they are warm and you brake lightly at speed e.g approaching a roundabout on a duel carriageway that the steering wheel wobbles due to slightly warped discs.


It's a very common issue on a lot of Citroens we get in at work with older callipers. Also having worked for Mitsubishi for 7 years they suffer it majorly. I've skimmed hundreds of front discs in that time either due to steering judder when braking or brake pedal judder.

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Posted 22nd Aug 2013 at 10:15
demondriverdan

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Post #22
So loads of possible different causes! I'd expect warped discs to be even worse when really pushing hard on the brakes though?

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Rallye Race Car
Posted 22nd Aug 2013 at 10:31
armzsc6

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Post #23
Depends how warped they are. If very then the brake pedal pulsates like crazy when braking hard. Personally I'd take the discs off and wet and dry everything on the hub so your 100%sure it's clean smooth and rust free. See what it's like.

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Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
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Posted 22nd Aug 2013 at 23:39

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