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Discussion Starter · #1 ·
Hey Everyone! My name is Callum and i've just bought myself a dark blue 2.7 V6 Hyundai Coupe MK3, 02 with 50 000 miles on and only one FEMALE driver from new.

There is however a slight problem with it and am just wondering if anyone can help? ... When I am rolling to a stop with my foot on the brake (not going fast and not pushing too hard on the brake) (usually not long after I start it up) a crunching noise occurs and I can feel, if u imagin a rough wheel rotating underneath the pedal ... at the same time I can hear a "ticking" noise and it doesn't let me push the pedal all the way down. The ABS and TCS OFF lights then come on.

Sorry for the crapy description lol, can anyone please help me? I'm not sure if its serious or not, sometimes I even have to put my foot on the brake several times before the brakes will actually slow the car down ... nearly went in the back of someone earlier because of it :S.

Cheers guys!

Cal.
 

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it sounds like the abs is playing up, it would be best to get the brakes checked out at a garage, it shouldnt cost too much to get the problem diagnosed at least.
 

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check the back of your disc is not chipped,

and that your calipres are not loos or missaligned

you could also have air in your brake lines
 

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I had the same symptoms on another car. It turned out the ABS rotor on the front drive shaft had cracked.
You may just have a dis-placed sensor.
Any half decent garage should be able to spot the problem for you.
If the ABS light is coming on it'll mean a fail come MOT time!
 

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I'd go with the others regarding the sensors on the ring but your description of having to basically pump the brakes to stop is nothing to do with the ABS. The car will stop normally with or without the ABS it's just that you'll not be able to steer and brake together on a slippery surface without ABS.
This issue suggests a problem with your fluid, pistons in the calliper(s) or the servo. Needs urgent attention. Personally I wouldn't drive it in this condition until examined.
Uncle Buck
 

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Discussion Starter · #6 ·
Ok thanks guys, I have now got the problem sorted ... it was a crack in the abs ring that was causing the car to think one of the wheels were locking up when I braked and so the abs was resisting me braking in order to stop the wheel from 'locking up'...£96 later, all sorted :D
 

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I'm glad you've sorted this out as it's a mighty important bit of kit, however, you haven't explained what caused you to have to pump the brakes to prevent a collision.
ABS has no effect on the normal barking efficiency of a car, it just adds the benefit of preventing the wheels from locking so your braking is efficient for longer and at the same time you can steer, which is impossible when your wheels are locked and your skidding.
Without ABS you have to lift your foot off the brake when they lock and you begin to skid which is less efficient, but you should never have to pump the brakes unless there's a loss of fluid or there's air in your system or the servo is acting up causing you to have to work harder to stop the car.
Uncle Buck
 

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Buck,
If you you read the original post Callum said he had to apply the brakes several times to get them to work.
sometimes I even have to put my foot on the brake several times before the brakes will actually slow the car down ... nearly went in the back of someone earlier because of it
When I had a cracked ABS rotor, I found that sometimes when I braked the ABS kicked in, other times it didn't. To get maximum braking I had to apply the brakes several times, until they operated normally (i.e. without ABS)

Soft brakes, requiring pumping, would indicated either a hydraulic leak, or air in the system, if not both. This problem, as you quite rightly state, will not 'go away' just because the ABS rotor has been changed. If these symptoms have 'gone away' I would suspect that the diagnosis of air and/or a leak was erroneous.
 

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Hi Labrat of Larbert,
I don't wish to enter into a dispute, but if the explanation given by oo7callum is accurate and not something perceived due to ABS being faulty, then an explanation as to why the brakes needed to be pumped is still needed.
The ABS will never decrease the normal braking efficiency of a vehicle to my limited knowledge, it only ever enhances it by preventing wheel lock in severe circumstances.
I've never heard of the ABS in any circumstances releasing the brake pressure without putting it back on in a millisecond which is what would be required to reduce braking efficiency. I'd be happy to stand corrected by an explanation from an expert.
Failure of ABS leaves you with the same baking efficiency as those poor souls who don't have it fitted. So, the question remains, why did the brakes need pumping?
I suspect in view of the explanation that this was a case of expecting poor baking because of the noises experienced and over reacting when heavy braking was needed. Not unusual by anyone's standards if your feeling suspicious about your brakes.
It may be that the repairing garage made a simple adjustment to the braking system that they didn't think worthy of mention.
If not, Something needs an urgent inspection. Problems, if real, don't just go away.
Perhaps an ABS specialist will read this and give an explanation to make oo7callum happy with his brakes, and the rest of us more knowledgeable.
Uncle Buck
 

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Discussion Starter · #11 ·
Uncle Buck said:
I'm glad you've sorted this out as it's a mighty important bit of kit, however, you haven't explained what caused you to have to pump the brakes to prevent a collision.
ABS has no effect on the normal barking efficiency of a car, it just adds the benefit of preventing the wheels from locking so your braking is efficient for longer and at the same time you can steer, which is impossible when your wheels are locked and your skidding.
Without ABS you have to lift your foot off the brake when they lock and you begin to skid which is less efficient, but you should never have to pump the brakes unless there's a loss of fluid or there's air in your system or the servo is acting up causing you to have to work harder to stop the car.
Uncle Buck
Yea sorry, perhaps I didn't explain it well enough ... Sometimes when I broke, it was asif there was something stopping me from putting the brake pedal down and a loud grinding noise could be heared (the abs thinking the wheel was locking up and so resisting me braking) so i would take my foot off, put it back on and it would brake...Sorry I should not have put 'several times'.

Thanks to all that gave advice!
 

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im having that exact same problem, sigh :x

buck to maybe provide some clairty on the issue,

when i put my foot on the brake it feels similar to running a bear rim on a road then it feels like its going to grab hold on the disc, so naturally i release the brake and try to apply it in smaller pumps after so to not "grab hold" of the disc or comprimise it in any way.

it only happens occasionally and tbh its normally when im braking and turning

all my running gear is new and my hubs and discs have been replaced so isuppose it only really leaves my abs ring
 

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Labrat of Larbert said:
Like you have a bag of lose gravel between your foot and the brake pedal.

Either a cracked ABS ring, a rusty ABS ring or a displaced sensor!
Or your driving like a maniac and causing the wheels to lock when braking in order to slow you down in time. (joke)
I haven't experienced this phenomenon nor do I know anyone who has, but I'm no ABS expert. I know the mechanics of the system which should never cause a braking problem other than the awful feel and noise of it in operation with continued pressure being applied. As for it coming on prematurely, well I can't say whether that's possible or if it would reduce braking efficiency. I don't believe it will as I believe the extra braking distance is the reaction of the driver to release the brakes for a moment, once or twice, in order to get rid of the apparently false application of the ABS system.
In any case, if anyone feels the brakes or ABS is not working as they expect, then seek advice from a mechanic experienced in ABS systems, you can't afford to depend on advice from the likes of me when we're discussing such a crucial part of your coupe.
If anyone does get expert advice re premature application of ABS and effects on braking, please update the post as I'm sure I'm not the only one wanting to know the outcome.
Uncle Buck
Uncle Buck
 
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