i30 Owners Club

GOT PROBLEMS OR ISSUES? => GENERAL => Topic started by: musicrab on April 25, 2015, 12:50:22

Title: i30 1.4 2014 (UK) braking instability
Post by: musicrab on April 25, 2015, 12:50:22
Hi - a strange issue; when braking from 40/50mph over minor road hollows results in a brief (1/2 second?) feeling that the front wheels have detached from the road; a very strange floating feeling - quite brief but when happened first time is was quite disconcerting.
Anybody else experienced this?
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: Phil №❶ on April 25, 2015, 13:25:08
Probably need more info, but check the obvious things like,

Tyre tread wear.
Road conditions.
Ambient temp.
All roads or only some.
Break wear.
Dry or wet.

To determine if it's the car or other conditions, some research will be necessary, to rule out non vehicle contributors.
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: eye30 on April 25, 2015, 13:29:36
May be the abs activating as i have felt similar on uneven roads
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: musicrab on April 25, 2015, 14:41:41
Tyre tread wear.
Road conditions.
Ambient temp.
All roads or only some.
Break wear.
Dry or wet.
Tread wear is good, dry, temp (varies between 5C and 20C), only uneven humps/bumps, break wear unknown (14K miles).  eye30 suggests ABS activating which I think is true, although only for a very short period.
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: eye30 on April 25, 2015, 18:07:18
Tyre tread wear.
Road conditions.
Ambient temp.
All roads or only some.
Break wear.
Dry or wet.
Tread wear is good, dry, temp (varies between 5C and 20C), only uneven humps/bumps, break wear unknown (14K miles).  eye30 suggests ABS activating which I think is true, although only for a very short period.
Feeling the pulse to the brakes which are similar to that described
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: Johnno on April 25, 2015, 18:44:35
 I get a similar feeling when just driving on poorly maintained roads, skating over bumps in the road, you get a slight left right movement feeling.
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: Phil №❶ on April 26, 2015, 00:51:15
Can't say I've ever experienced this sensation.
Especially on a dry road without snow ice or any other debris.
The ABS should only be felt when the device senses a wheel about to lock, or the ESP detects an irregular condition, so are you braking or steering aggressively.  :Dunno:
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: musicrab on April 26, 2015, 08:44:00
Can't say I've ever experienced this sensation.
Especially on a dry road without snow ice or any other debris.
The ABS should only be felt when the device senses a wheel about to lock, or the ESP detects an irregular condition, so are you braking or steering aggressively.  :Dunno:
(locally where this issue happens) Slowing down from 40/50 in preparation for a sharp left-hand bend there are a couple of bumps/uneven tarmac surface and, yes, I may be breaking fairly firmly.
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: Phil №❶ on April 26, 2015, 09:17:45
Sounds like the ESP taking care of the rear end for you and keeping you safe.  :goodjob2:
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: Lorian on April 26, 2015, 10:16:57
I've been known to drive pretty quickly on twisty country roads, and in 5 years of ownership I only recall ESP intervene twice, on both occasions I'd probably have been in the hedge without it, and its not what I'd call a floaty experience. I don't think the OP describes a regular ABS experience either. I can hear/feel the ABS pump, even f I don't notice the light flashing, and its more of a shuddery crunchy feeling.

I'd be checking the front suspension I think.
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: tohis on April 26, 2015, 21:18:05
I've been known to drive pretty quickly on twisty country roads, and in 5 years of ownership I only recall ESP intervene twice, on both occasions I'd probably have been in the hedge without it, and its not what I'd call a floaty experience. I don't think the OP describes a regular ABS experience either. I can hear/feel the ABS pump, even f I don't notice the light flashing, and its more of a shuddery crunchy feeling.

 :whsaid:

I have never seen the ESP come alive in my i30, not even in our slippery winter conditions (except when I did some handbrake turns deliberately). Some cars are very keen to activate ESP for the slightest abnormal movement, but I can say the i30 is not one of them; it must be in the midst of serious spin before ESP will activate.
Title: Re: i30 1.4 2014 (UK) braking instability
Post by: Phil №❶ on April 27, 2015, 01:50:57
 :Shocked: :sweating:
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