Braking
Author
Discussion

Gelf VXR

Original Poster:

713 posts

229 months

Thursday 25th January 2007
quotequote all
Ive noticed that under continued moderate braking at high speed I some times experience vibration on the foot pedal. I'M wondering if the disks are warped, when they get hot this becomes more apparent, or is this the ESP, it feels a bit like ABS?

greens vauxhall

830 posts

231 months

Thursday 25th January 2007
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Shouldnt be vibration from any speed really, a bit of drone under very heavy application, but not vibration.

wayne marsh

117 posts

229 months

Thursday 25th January 2007
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I collected my new VXR 2-weeks ago tomorrow. From new and up to about 600 miles I had a really bad shudder back through the steering when braking from anything ovr 85mph. However, it now seems okay - the car having now covered 1300 miles. I think the brakes have now bedded in okay. However, I don't think they are man enough and feel an AP brake upgrade is going to happen soon. Hope this helps

Gelf VXR

Original Poster:

713 posts

229 months

Thursday 25th January 2007
quotequote all
I have felt it on two occasions now, the pedel moves up and down, similar to ABS but without excessive pressure being applied, aftr braking from high speed

wayne marsh

117 posts

229 months

Thursday 25th January 2007
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You sure it's not the ABS?

Gelf VXR

Original Poster:

713 posts

229 months

Thursday 25th January 2007
quotequote all
wayne marsh said:
You sure it's not the ABS?


No, I ve had ABS before, it cuts in on ice or gravel and its more of a judder on the pedal, but not ESP, which is what i think it may be??


uk hsv

1,692 posts

275 months

Thursday 25th January 2007
quotequote all
From ESP I assume you mean traction control? If so the Monaro (6.0ltr) has a very simple system that just closes the throttle if it detects wheelspin, there are no links to the throttle pedal as it is drive by wire.

Most/All the current Monaro's for sale have been standing for about a year now and have flat spoted tyres and rusty brake discs.........the tyres do come good again after a 1000 miles or so but might need re balancing!! As for the brakes they seem to sort themself's out after the 1000 miles but not all do so make your dealer aware now so when you come back for new ones he cant blame you for warping them.....

habitualvoyeur

144 posts

230 months

Thursday 25th January 2007
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Yes.... my pre reg VXR has flat spots on all 4 tyres.I've done 1300 miles now.
I had them balanced, 2 took a lot a weight, still got a vibration from the rear at 80mph so might see if I can score a couple of new tyres under warranty ??
Brakes are OK, but I've got a Oxygen sensor/heater out now - aparently thats not helped /caused by sitting in a car park in Luton for over a year.
Regards Neil

wayne marsh

117 posts

229 months

Friday 26th January 2007
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This is all good advice. At 1300 miles the steering and braking on my car has improved. This would suggest that the brakes will bed in after a few miles but I guess the question should be are we likely to find that the discs will "expire" sooner owing to the fact that the cars have stood for a while. My advice is therefore log the complaint and then if you do have a problem later the dealer shouldn't argue!

mackie1

8,168 posts

255 months

Gelf VXR

Original Poster:

713 posts

229 months

Friday 26th January 2007
quotequote all
mackie1 said:


An interesting read and insight to my problem.

Thanks

mackie1

8,168 posts

255 months

Friday 26th January 2007
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Mine rumble a bit when used fairly hard, I've never had a grooved disk setup that didn't.
If it's really bad you could get them skimmed (various places can do this with the disks on the car) and then bed them in again like the article says.

AFAIK the disks on the VXR can be machined a couple of times before they need replacing.

gareth h

4,157 posts

252 months

Friday 26th January 2007
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Mine rumbled badly until I bought upgraded pads from Roger.

mackie1

8,168 posts

255 months

Friday 26th January 2007
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gareth h said:
Mine rumbled badly until I bought upgraded pads from Roger.


Mm, I've heard good things about these so when it needs new pads I'll be getting the uprated ones.

Boyce

204 posts

233 months

Friday 26th January 2007
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UK HSV said
"From ESP I assume you mean traction control? If so the Monaro (6.0ltr) has a very simple system that just closes the throttle if it detects wheelspin, there are no links to the throttle pedal as it is drive by wire."

Sorry don't know how to insert those clever boxes.
There seems a very real link to the throttle pedal on my VXR, when the traction cuts in at a slow speed i.e pulling out of a junction and turning, the pedal physically pulls away from my right foot and slaps back when the spin is controlled.

On the same theme, if someone can clarify, I'm sure I read in the owners manual somewhere that the abs system also works in conjuction with the traction to moderate wheel spin. Not at home at the mo so can't look it up again.

Cheers Boyce

uk hsv

1,692 posts

275 months

Friday 26th January 2007
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Do you have a 5.7ltr VXR or a 6.0ltr one ?

5.7 has a throttle relaxer which closes the throttle via a cable and pulls the peddal away from your foot......

6.0 all the throttle closing is done via the PCM as it is fly by wire.

The traction control is limited to just reducing power it has no link to the brakes.......it is very simple

Boyce

204 posts

233 months

Sunday 28th January 2007
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Yep mines a 04 MY VXR, so that explains it cheers.

SS HSV

9,646 posts

280 months

Sunday 28th January 2007
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mackie1 said:


Another thumbup from me too - very intersting reading. Makes you wonder how all the dealers justify warped discs as several of my cars have had discs replaced and not under warranty. I wonder if they just scarify them and put them back into stock?

V8 EOL

2,782 posts

244 months

Sunday 28th January 2007
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uk hsv said:
5.7 has a throttle relaxer which closes the throttle via a cable and pulls the peddal away from your foot......
I have found if you push really hard you can override it!

ringram

14,701 posts

270 months

Sunday 28th January 2007
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I think it uses the cruise control stuff to mess with the cable IIRC.