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Hyundai i30 - Breaking issue - Sam88

Hello

So, about 2 months ago I started hearing a whirring noise coming from the breaks. So took it into the garage and they said it needed new front pads and discs.. so got them done but then the breaks started making an intermittent crunching/grinding noise when coming to a stop. So took the car back to the garage and they said it was actually the rear pads and discs.. got them changed. But the intermittent crunching/griding did not go away.

Took the car back a further two times but the garage say they can not see or hear any issues at all.

The car breaks are makeing a grinding noise and and the peddle vibrates as though the abs is kicking in, although the abs light never comes on. This only happens when stopping in first gear after a 20 minute or so drive but will continue to happen at every stop thereafter.

Atm I am stopping the car in 2nd gear and it seems to have stopped the grinding.

Any ideas?

Hyundai i30 - Breaking issue - bathtub tom

Where did you take the car to deal with the brakes, a 'fit quick' type emporium?

Hyundai i30 - Breaking issue - edlithgow

Atm I am stopping the car in 2nd gear and it seems to have stopped the grinding.

Any ideas?

Ok, so you've "fixed" it.

Don't have much relevant experience, since I nearly always stop in neutral, to avoid reverse-loading the transmission.

I reckon stopping is what brakes are good at, until they break.

The involvement of engine braking suggests this might be a transmission issue rather than a braking issue, though probably still a breaking issue.

If your garage (after of course selling you some stuff that you might or might not have needed), were looking for brake brokeness they might have been looking in the wrong place.

For example, could be a gearbox bearing, driveshaft bearing, wheel bearing or CV joint that is breaking a bit. CV joint is perhaps most likely, but in that case it would be expected to click some on full lock.

I might jack it up and spin the wheel, trying to feel for bearing roughness and looking for wheel wobble/excessive runout, which would be suggestive of wheel bearing failure, assuming your garage cleaned things up enough that the wheel is sitting true. A failing wheel bearing might get quite hot, and an IR thermometer might give you some clue.

Stopping in first gear will impose the greatest load on the transmission, which might be why its currently OK in second. If this is correct and it breaks a bit more, you might find you have to successively go to third, fourth, etc to avoid the symptoms, or you could skip the intermediate gears and just stop using engine braking.

If this is correct it'll probably eventually start to give problems on acceleration too, and then would need fixed.

Edited by edlithgow on 28/05/2022 at 02:08

Hyundai i30 - Breaking issue - Rerepo

I'm wondering if when they did the front brake job they damaged an ABS sensor and the ABS is kicking in when coming to a stop. Low sensor output would do this.

Hyundai i30 - Breaking issue - edlithgow

I'm wondering if when they did the front brake job they damaged an ABS sensor and the ABS is kicking in when coming to a stop. Low sensor output would do this.

Why would you expect this to be influenced by the gear you are in?

Hyundai i30 - Breaking issue - Bolt

I'm wondering if when they did the front brake job they damaged an ABS sensor and the ABS is kicking in when coming to a stop. Low sensor output would do this.

Why would you expect this to be influenced by the gear you are in?

Actually I`m struggling to see why its working like that, unless the gear is causing the grind which is a reason why a lot of people do not use the gears to slow down as it can ruin the box, as for

Why would you expect this to be influenced by the gear you are in?

it was mentioned the pads/discs were replaced and the pedal pulsed after that, so must be related to damaged ABS sensor, the actual grinding doesn`t imo make sense as of the description of the problem, might be me but doesn`t sound right to me ?

Hyundai i30 - Breaking issue - edlithgow

I'm wondering if when they did the front brake job they damaged an ABS sensor and the ABS is kicking in when coming to a stop. Low sensor output would do this.

Why would you expect this to be influenced by the gear you are in?

Actually I`m struggling to see why its working like that, unless the gear is causing the grind which is a reason why a lot of people do not use the gears to slow down as it can ruin the box, as for

Why would you expect this to be influenced by the gear you are in?

it was mentioned the pads/discs were replaced and the pedal pulsed after that, so must be related to damaged ABS sensor, the actual grinding doesn`t imo make sense as of the description of the problem, might be me but doesn`t sound right to me ?

If, say, there was a failing hub bearing or CV joint causing a bit of runout wobble, I suppose that might explain pedal pulse and the transmission involvement.

No experience of ABS and would like to keep it that way, so can't comment on its involvement.

Hyundai i30 - Breaking issue - Bolt

I'm wondering if when they did the front brake job they damaged an ABS sensor and the ABS is kicking in when coming to a stop. Low sensor output would do this.

Why would you expect this to be influenced by the gear you are in?

Actually I`m struggling to see why its working like that, unless the gear is causing the grind which is a reason why a lot of people do not use the gears to slow down as it can ruin the box, as for

Why would you expect this to be influenced by the gear you are in?

it was mentioned the pads/discs were replaced and the pedal pulsed after that, so must be related to damaged ABS sensor, the actual grinding doesn`t imo make sense as of the description of the problem, might be me but doesn`t sound right to me ?

If, say, there was a failing hub bearing or CV joint causing a bit of runout wobble, I suppose that might explain pedal pulse and the transmission involvement.

No experience of ABS and would like to keep it that way, so can't comment on its involvement.

ABS pedal pulse reacts very quickly to keep the wheel from stopping or locking up, sounds like a hammer drill working on some cars as it works (best way I can explain it) disc runout wont be as fast pumping the pedal as the runout only occurs when the disc is in a certain position so is slower....but then they are new apparently ?

CVJ I would count out, unless its causing a vibration or clicking on turns

wheel bearing more like it, though that would be whining unless its breaking up, but then you would definitely hear that noise and would sound like the wheel was falling off (I have seen cars driven with melted hubs into a garage I worked in and cost a new hub assy years ago) but didn`t understand why they didn`t feel the wheel drag- but never mind