Braking judder/bounce

stevenh · 15-11-2006, 23:15

Since I have had my Octy, there have been times when I have been aware of a slight judder under breaking.

I have always put it down to warped discs, but tonight on the way home from work (about 1/2 hour ago) I was driving 'spiritedly' and when I was braking with either the clutch depressed, or with the car in neutral I would sometimes get a judder that actually felt more like the front end was bouncing slightly!!!

If I had egg shaped wheels you'd get the same effect but waaaayyyy more obvious

best way I can explain really.

When the car is cold, I also think there is a slight 'looseness' to the front end which I thought could be down to ARB bushes?

The car sits fine at speed on motorways, and if you brake hard the wobble/judder/bounce is not evident - it's only when braking slightly firm if that makes sense.

I had an engineers inspection done on the car when I found out it had ben in an accident after being stolen but it came back fine - chassis straight as a pin, it appears only cosmetic damage was done.

Any ideas what could be causing these symptoms?

Do you think a full geometry check would show anything up?

Also is it common for vRS to transmit a fair bit of road noise and rumbling when running Conti tyres? I have no point of reference to know whether mine is abnormal or not.

I only want to have 100% confidence in the car and it's handling which at the moment I do not.

Cheers,
Steven.

mluton · 15-11-2006, 23:44

Mine does it, feels like a grinding judder to me. I put it down to the ABS, as my MR2 did the same.

stevenh · 15-11-2006, 23:50

I've felt ABS kick in many times before, especially with my old Cavalier 16V and my Prelude 2.2 VTEC (which I had 110% trust in handling-wise) and neither felt like this!

I don't think I was braking hard enough for ABS to kick in, I certainly never felt the front begin to lock up at all.

Cheers for the reply tho mate

cheezemonkhai · 16-11-2006, 01:36

Get your front wheels fingerplate balanced if you think it it wobbling at the front end.

Mind still does a slight wobble on the brakes, but not all the time. It isn't a VRS however.

Goochie · 16-11-2006, 08:30

Youd' feel ABS through the brake pedal too - and i guess you're not?

have you changed the pads?

fatty5000 · 16-11-2006, 09:49

i just changed a wishbone which was making the car wobble a bit not noticable at high speed
my trye fitter noticed the whole wheel shifting under slow braking in fact as i was rolling on the tracking ramp
the rearbush on the W.B. was knackered but it needed jacking and a crow bar to really see it move once raised
don't know whether this helps

stevenh · 17-11-2006, 23:17

General consensus is warped discs.

Letting a mechanic mate have a wee looksee tomorrow.

Popped into West End Skoda to price discs and pads - told them i'd probably go to GSF instead

I will be going to West End next Friday tho to get the ARB bushes replaced under warranty.

With those done and the new brakes, all I will need is new tyres and i'll be pretty happy for now!

cheezemonkhai · 18-11-2006, 11:48

GSF brembo and pagid works fine and were £100 cheaper than dealer.

Have you tried taking the pads off brushing the discs with some fine wire brush to remove and deposits on it and ditto for the pad surface. Might be worth trying before you replace the disks and pads though.

Goochie · 18-11-2006, 11:51

Quote:

Originally Posted by cheezemonkhai

GSF brembo and pagid works fine and were £100 cheaper than dealer.

Have you tried taking the pads off brushing the discs with some fine wire brush to remove and deposits on it and ditto for the pad surface. Might be worth trying before you replace the disks and pads though.

Had to do this several times when I worked on an airfield and 130+MPH stops were a daily occourance

bpm · 18-11-2006, 20:20

I had this a few months back on a trackday. Turned out it was the front shocks needed replacing.

stevenh · 19-11-2006, 14:30

Going to get the car on a set of rollers next Sat to test the braking power for both front and rear.

My mate thinks it is the rear discs/pads as you feel it much more thru the pedal rather than the steering wheel.

Quite happy if it's the rear as they will be cheaper - I already need 2 new tyres imminently and the other 2 in the next 4 months or so.

And i'm saving up for a Gilmour and other bits too - damn cars

15-11-2006, 23:15	#1
stevenh Briskodian Join Date: Feb 2006 Location: Location, Location Posts: 1,057 Thanks: 27 Thanked 33 Times in 21 Posts	Braking judder/bounce Since I have had my Octy, there have been times when I have been aware of a slight judder under breaking. I have always put it down to warped discs, but tonight on the way home from work (about 1/2 hour ago) I was driving 'spiritedly' and when I was braking with either the clutch depressed, or with the car in neutral I would sometimes get a judder that actually felt more like the front end was bouncing slightly!!! If I had egg shaped wheels you'd get the same effect but waaaayyyy more obvious best way I can explain really. When the car is cold, I also think there is a slight 'looseness' to the front end which I thought could be down to ARB bushes? The car sits fine at speed on motorways, and if you brake hard the wobble/judder/bounce is not evident - it's only when braking slightly firm if that makes sense. I had an engineers inspection done on the car when I found out it had ben in an accident after being stolen but it came back fine - chassis straight as a pin, it appears only cosmetic damage was done. Any ideas what could be causing these symptoms? Do you think a full geometry check would show anything up? Also is it common for vRS to transmit a fair bit of road noise and rumbling when running Conti tyres? I have no point of reference to know whether mine is abnormal or not. I only want to have 100% confidence in the car and it's handling which at the moment I do not. Cheers, Steven. __________________

15-11-2006, 23:44	#2
mluton I have VAG COM Join Date: Jul 2006 Location: South Birmingham Posts: 6,132 Thanks: 41 Thanked 197 Times in 173 Posts	Re: Braking judder/bounce Mine does it, feels like a grinding judder to me. I put it down to the ABS, as my MR2 did the same. __________________ Support Briskoda----------------------> Red Skoda Octavia V//RS Mods to date: Carbonio CAI Forge 007 DV Aero Wipers Briskoda Stickers KVW100 GB Wheel Inserts RS Tuning Remap Delocked Piper Cat Back Kenwood KDC-W6541U Fli Twin 12" Active Sub *------------------------------------------------*

15-11-2006, 23:50	#3
stevenh Briskodian Join Date: Feb 2006 Location: Location, Location Posts: 1,057 Thanks: 27 Thanked 33 Times in 21 Posts	Re: Braking judder/bounce I've felt ABS kick in many times before, especially with my old Cavalier 16V and my Prelude 2.2 VTEC (which I had 110% trust in handling-wise) and neither felt like this! I don't think I was braking hard enough for ABS to kick in, I certainly never felt the front begin to lock up at all. Cheers for the reply tho mate __________________

16-11-2006, 01:36	#4
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 13,728 Thanks: 75 Thanked 337 Times in 311 Posts	Re: Braking judder/bounce Get your front wheels fingerplate balanced if you think it it wobbling at the front end. Mind still does a slight wobble on the brakes, but not all the time. It isn't a VRS however. __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

16-11-2006, 08:30	#5
Goochie Briskodian Join Date: Jan 2004 Location: Up a tree. Posts: 12,384 Thanks: 7 Thanked 27 Times in 25 Posts	Re: Braking judder/bounce Youd' feel ABS through the brake pedal too - and i guess you're not? have you changed the pads?

16-11-2006, 09:49	#6
fatty5000 Why So Serious Join Date: Jan 2006 Location: "What" ...What ain't no god damn coutry Posts: 4,577 Thanks: 203 Thanked 130 Times in 117 Posts	Re: Braking judder/bounce i just changed a wishbone which was making the car wobble a bit not noticable at high speed my trye fitter noticed the whole wheel shifting under slow braking in fact as i was rolling on the tracking ramp the rearbush on the W.B. was knackered but it needed jacking and a crow bar to really see it move once raised don't know whether this helps __________________

17-11-2006, 23:17	#7
stevenh Briskodian Join Date: Feb 2006 Location: Location, Location Posts: 1,057 Thanks: 27 Thanked 33 Times in 21 Posts	Re: Braking judder/bounce General consensus is warped discs. Letting a mechanic mate have a wee looksee tomorrow. Popped into West End Skoda to price discs and pads - told them i'd probably go to GSF instead I will be going to West End next Friday tho to get the ARB bushes replaced under warranty. With those done and the new brakes, all I will need is new tyres and i'll be pretty happy for now! __________________

18-11-2006, 11:48	#8
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 13,728 Thanks: 75 Thanked 337 Times in 311 Posts	Re: Braking judder/bounce GSF brembo and pagid works fine and were £100 cheaper than dealer. Have you tried taking the pads off brushing the discs with some fine wire brush to remove and deposits on it and ditto for the pad surface. Might be worth trying before you replace the disks and pads though. __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

18-11-2006, 20:20	#10
bpm Drink me! Join Date: Apr 2004 Location: Dublin Posts: 2,030 Thanks: 12 Thanked 21 Times in 18 Posts	Re: Braking judder/bounce I had this a few months back on a trackday. Turned out it was the front shocks needed replacing. __________________ BPM This is a website , NOT a mobile phone. STP USNG TXT SPK

19-11-2006, 14:30	#11
stevenh Briskodian Join Date: Feb 2006 Location: Location, Location Posts: 1,057 Thanks: 27 Thanked 33 Times in 21 Posts	Re: Braking judder/bounce Going to get the car on a set of rollers next Sat to test the braking power for both front and rear. My mate thinks it is the rear discs/pads as you feel it much more thru the pedal rather than the steering wheel. Quite happy if it's the rear as they will be cheaper - I already need 2 new tyres imminently and the other 2 in the next 4 months or so. And i'm saving up for a Gilmour and other bits too - damn cars __________________

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode