Author Topic: 2012 i30 brake failure  (Read 901 times)

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  • gb United Kingdom
    Wiltshire
2012 i30 brake failure
« June 15, 2018, 11:18:38 »
Had our i30 for just over a year now. We have had a few problems but main one is the brakes. I was approaching a round about when I lost all brakes. My foot hit the floor and nothing happened. Wasn't until brakes were pumped they slightly worked. Got my car off the road and 15 minutes later brakes work again. Now I'm worried they will cut out again. I have brake fluid. And brakes don't need changing. Have done a brake fluid change and just wondered if anyone else had come across this problem as hyundai are no use what so ever


  • Hyundai i30

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  • se Sweden
    Varmland, Sweden
Re: 2012 i30 brake failure
« Reply #1 : June 15, 2018, 12:24:49 »
Only thing i can think of is checking that the pusher pins are properly lubed up, everything else seems to be in order. But the pumping would hon at the pins seezing or the ABS failing, but the latter should throw a code.
  • i30 GD Tourer 1.6l CRDI 81kW M6 MY2014. Odo: 100k km as of May 2018.

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  • au Australia
    Ipswich
Re: 2012 i30 brake failure
« Reply #2 : June 15, 2018, 13:03:49 »
Did the problem occur before or after the fluid change?

Were the brakes being worked hard and getting hot?

any evidence of fluid leakage at master cylinder?

Never had the pleasure of brake failure but have experienced low erratic pedal in a vehicle with leaky slave cylinders allowing air in, not applicable here but calipers can leak again something I've never had.

SO I'm thinking overheated brakes with old fluid if water contaminated can lower boiling point which in turn if the fluid boils then it becomes a gas and being compressible would mean no or greatly reduced pressure in the lines.

Or

Master cylinder failure, could be worn internal bore, seal failure or faulty valving


How's the fluid level been? has it needed regular top ups? Gradual level drop over long time is normal as the pads wear and the pistons adjust
  • 2008 i30 SLX CRDi Auto, 2010 i30CW SLX CRDi Auto. 2008 i30 CRDi SX manual, Welly

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  • au Australia
    Caloundra, Queensland.
Re: 2012 i30 brake failure
« Reply #3 : June 15, 2018, 16:48:10 »
I've cooked my brakes many times. It's a hazard of rally cars on long downhill stages.
But the pedal has never gone all the way to the floor.

I'm puzzled about this problem. With split system brakes, Surely if the pedal went all the way to the floor but pumped up a bit the issue would be in the master cylinder.

Or is it too early in the morning for my brain to be working properly?
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  • au Australia
    Ipswich
Re: 2012 i30 brake failure
« Reply #4 : June 15, 2018, 17:27:55 »
I've cooked my brakes many times. It's a hazard of rally cars on long downhill stages.
But the pedal has never gone all the way to the floor.

I'm puzzled about this problem. With split system brakes, Surely if the pedal went all the way to the floor but pumped up a bit the issue would be in the master cylinder.

Or is it too early in the morning for my brain to be working properly?
So long as sun is shining you should be safe. I'd go with master as most likely place to start with .
  • 2008 i30 SLX CRDi Auto, 2010 i30CW SLX CRDi Auto. 2008 i30 CRDi SX manual, Welly

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  • au Australia
Re: 2012 i30 brake failure
« Reply #5 : June 15, 2018, 17:33:36 »
You haven't lived until you have all 4 pads smoking..... :whistler:

From memory pedal nearly went to the floor from memory....

Is there a chance of air in the brake fluid after the fluid change?
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  • au Australia
    Ipswich
Re: 2012 i30 brake failure
« Reply #6 : June 15, 2018, 17:45:57 »
You haven't lived until you have all 4 pads smoking..... :whistler:

From memory pedal nearly went to the floor from memory....

Is there a chance of air in the brake fluid after the fluid change?
Looks like you are having a memory overrun :rofl:

I guess we may learn more when they reply to my line of questioning :whistler:
  • 2008 i30 SLX CRDi Auto, 2010 i30CW SLX CRDi Auto. 2008 i30 CRDi SX manual, Welly

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  • au Australia
    Caloundra, Queensland.
Re: 2012 i30 brake failure
« Reply #7 : June 15, 2018, 17:49:32 »
You haven't lived until you have all 4 pads smoking..... :whistler:

From memory pedal nearly went to the floor from memory....

Is there a chance of air in the brake fluid after the fluid change?
Looks like you are having a memory overrun :rofl:

I guess we may learn more when they reply to my line of questioning :whistler:
My take from the OP was that all then things done to the brakes were in response to the original failure.
  • 2013 Toyota Corolla Ascent Sport 6sp Manual. formerly 2009 i30 Hatch 5sp Manual.

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  • au Australia
    Ipswich
Re: 2012 i30 brake failure
« Reply #8 : June 15, 2018, 17:54:11 »
You haven't lived until you have all 4 pads smoking..... :whistler:

From memory pedal nearly went to the floor from memory....

Is there a chance of air in the brake fluid after the fluid change?
Looks like you are having a memory overrun :rofl:

I guess we may learn more when they reply to my line of questioning :whistler:
My take from the OP was that all then things done to the brakes were in response to the original failure.
Implied, just nice to confirm the order of things it  :winker:
  • 2008 i30 SLX CRDi Auto, 2010 i30CW SLX CRDi Auto. 2008 i30 CRDi SX manual, Welly

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  • au Australia
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Re: 2012 i30 brake failure
« Reply #9 : June 15, 2018, 18:07:20 »
Hi, I was under the impression this was extremely unlikely to happen in normal driving with a modern vehicle due to there being a split system. One for each diagonally opposing set of wheels?

I did a google for brake failure in Hyundai i30 and it bought me straight back to our site! Seems to be extremely rare with i30's as I suspected.

There was this one (split hose during MOT)

:link: COMPLETE Brake failure

and this, not actually a failure but a recall related to the brake light switch.

:link: i30 FD and FDe recalling for brake valve problem.

this one is the closest I could find but no conclusion - I wonder if I can contact Katy to find out what happened.

:link: Brakes failure

EDIT: I'm sending Katy an email to see what ended up happening. Hoping she hasn't changed her email address or died in a horrible accident related to brake failure!  :sweating:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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  • au Australia
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Re: 2012 i30 brake failure
« Reply #10 : June 15, 2018, 19:35:19 »
Just re-read the first page of Katy's issue.
I still feel it was ABS which would suggest she WAS on a slippery surface like ice. Which is quite possible. She said she has experienced ice before in her long driving history but I reckon it was her first time on ice with ABS.
  • 2013 Toyota Corolla Ascent Sport 6sp Manual. formerly 2009 i30 Hatch 5sp Manual.

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  • au Australia
    Samford Valley
Re: 2012 i30 brake failure
« Reply #11 : June 15, 2018, 23:01:06 »
I still feel it was ABS which would suggest she WAS on a slippery surface like ice. Which is quite possible. She said she has experienced ice before in her long driving history but I reckon it was her first time on ice with ABS.

Like yo'l, Im at a loss to explain how a sealed system can go pedal to the floor, pump up and then show no signs of fluid loss or air in.

So ABS on ice  or oil would seem reasonable to me too.  :goodjob2:
The brain doesn't necessarily rationalise these unexpected moments.
For instance, Main Roads 'upgraded'  :rolleyes:  the road out of Samford Valley. When it is wet, we now have numerous cars coming unstuck on one badly designed bend ( downhill with the wrong cambre) .
A young female driver I know, rolled and totalled her FD there recently. She swears that the Hyundai's steering locked solid.
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  • gb United Kingdom
    Wiltshire
Re: 2012 i30 brake failure
« Reply #12 : June 16, 2018, 05:36:42 »
We changed the fluid after and car had only been running 15 minutes. I wasn't working the brakes as had kids in the car so don't tend to rally around lol. Just worried will happen again and no error codes either
  • Hyundai i30

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  • gb United Kingdom
    Wiltshire
Re: 2012 i30 brake failure
« Reply #13 : June 16, 2018, 05:41:26 »
Also no ice or oil. Was like it for a few miles until we could pull over. Other half said pumping brakes helped slightly. Completely baffled now only make short journeys as usually on motorway alot
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  • au Australia
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Re: 2012 i30 brake failure
« Reply #14 : June 17, 2018, 19:03:04 »

EDIT: I'm sending Katy an email to see what ended up happening. Hoping she hasn't changed her email address or died in a horrible accident related to brake failure!  :sweating:


Email returned. Hopefully just changed their email address.  :undecided:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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Re: 2012 i30 brake failure
« Reply #15 : June 24, 2018, 09:55:13 »
once had similar experience with a previous car (mitsi colt) driving normally came up to the lights foot straight to the floor. 10 min later every thing normal.
i didn't know this till later but brake fluid like diesel adsorbs moisture, the fluid had been changed and the mechanic used an open bottle then topped with a new bottle. we suspect the open bottle was contaminated with moisture that turned to steam at the calliper which compresses at a different rate to the fluid
to be sure new unopened fluid and bleed each cylinder make sure the correct dot fluid is used 

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Re: 2012 i30 brake failure
« Reply #16 : June 24, 2018, 16:47:06 »
 :ta: for that.
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

 


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