Brake Judder

[Thundercliffe81]

Hey up. This has come on over past few days. Out of nowhere really.

Think it's the rears. Got car 3 months ago. New front discs and pads. Rear discs were at 40% worn.

No dash warnings. Does the sensor only pick up disc thickness? Could it be the pads? I've done a few emergency stops to try shave any filth off but doesn't seem to be the issue. Car just touched 50k miles so I was aiming off for rear discs. Thoughts? Worse at slow speeds and light application.


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[Covkiller]

I know this is a B7 thread but the same resolution may well sort you out too and it's cheap.
viewtopic.php?f=35&t=129789&p=895714&hi ... ed#p895714

[Thundercliffe81]

I know this is a B7 thread but the same resolution may well sort you out too and it's cheap.
viewtopic.php?f=35&t=129789&p=895714&hi ... ed#p895714

Thanks bud. I'd wondered if it was warped discs. Was hoping it wasn't like. Will have a read through this now. Just got back. He's been through a fair journey tbh. Proud of him. 16hr round trip.


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[Thundercliffe81]

I know this is a B7 thread but the same resolution may well sort you out too and it's cheap.
viewtopic.php?f=35&t=129789&p=895714&hi ... ed#p895714

Hey up.

Yup. Reckon that could be the culprit but I've driven 5k miles now with it. Front discs were changed about a month before I bought it by previous owner. It defo feels like the rear drivers side. And reading that thread, it's a judder through the wheel. Exact same as the OP.

Taking it in in a weeks time to get resonator put on the milly. Think I'll ask Chris at CM tuning if he can skim them (if salvageable).

What is the general consensus on driving with this issue (pottering about) until that point? Good job that CR-15 strut brace is out of stock haha. Gonna need the cash now.


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[Surrey Sam]

Pottering around would be no issue for a little while.

If the juddering was from the rear I would expect to feel it through the seat, rather than through the steering wheel. I clear my holes out every 6 months and have experienced the disc seize on the expansion pins, made an awful bang once it un-seized from triple digit speeds

[Thundercliffe81]

Pottering around would be no issue for a little while.

If the juddering was from the rear I would expect to feel it through the seat, rather than through the steering wheel. I clear my holes out every 6 months and have experienced the disc seize on the expansion pins, made an awful bang once it un-seized from triple digit speeds

Blimey.

Bet that was a twitchy bum moment. It is coming from the rear. I'm certain. Felt in my seat and we had a full load in the back. Things were vibrating hard and bottles clanging together.

Do you think it could just be the holes clogged up? It's all a learning experience anyway but I'd prefer not to have to replace rear brakes 'just' yet. I'll have a better look in the morning in daylight.

Just been looking at EBC and Pagid pads. There's a couple of listings on eBay for new OEM rear discs. Creweaudi sold out.


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[Covkiller]

I'd recomend drilling the holes clear and a really good clean before skimming. It's worth the time and may save you money and hassle.

[Thundercliffe81]

I'd recomend frilling the holes clear and a really good clean before skimming. It's worth the time and may save you money and hassle.

Yeah I agree. Because I've had no issues in past 5k miles. What does the re-drilling do? As in, with the holes being clogged, what impact does that have on the disc and the pad when it's in contact with it? Just out of curiosity.


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[Covkiller]

Frilling, I mean drilling bloody check
I assume they stay cooler with the holes drilled out and cleanliness is next to godliness as the lowered is with me
It always work for me

[Thundercliffe81]

Frilling, I mean drilling bloody check
I assume they stay cooler with the holes drilled out and cleanliness is next to godliness as the lowered is with me
It always work for me

Well that's enough for me.

Seeing the 'blackness' inside them holes always irked me

I'll give it a shot. Let you know in a few days. Chris at CM hasn't got machine to skim but if I fail in my endeavour then I'll see what his verdict is and go from there.


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[Thundercliffe81]

Pretty damn sure this is the cause of the shuddering. After getting to see all four discs in the light today:













I have a hunch this is due to several factors. The heat from the two long journeys, adaptive cruise control and hill hold assist (in conjunction with the heat). Getting them cleaned and re-drilled at CM Tuning next week I'll be pretty surprised if this doesn't sort it. Cheers guys for the help as always. Watched some great tutorials today from Chris Fix channel etc on YouTube.

The rear discs have a fair old lip on them but still life in them for a while. Is everybody sticking to the stock pads? Separate Brembos or EBC ? If I go EBC I'd probably go Red stuff. Street use blend. Just to see if the discs last longer. It'll be the rears that I try this on with some new stock discs. So not as dependent like the fronts would be.


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[Surrey Sam]

Some of the holes aren't actually holes. They're dimples and i really couldn't tell you why, as just changed my front discs (0.4mm) below spec and the dimples were still there.

Worth getting CM Tuning to check the thickness of the Front and Rear discs, those rears do look a little close to needing a change. I've kept with OEM rear pads, as they don't do much work but I might look to try some Hawk Ceramic pads for the Front, as I want to reduce dust levels. Ferodo DS2500 are often touted on here as being suitable replacements though. It's been 18 years since I used EBC red stuff, they were not a bad pad but found were heavy on discs. Back then I preferred Pagid Blues to those, but things change. As it happens OEM front Audi RS4 pads were Pagid but now taken over by Brembo and the rears are currently produced by TRW. My concern is there's a lot of online chatter about cheap 'Brembo' 'Pagid' pads being made with inferior compounds for these large retailers, I can't comment either way as have no experience with using them.

[Thundercliffe81]

Some of the holes aren't actually holes. They're dimples and i really couldn't tell you why, as just changed my front discs (0.4mm) below spec and the dimples were still there.

Worth getting CM Tuning to check the thickness of the Front and Rear discs, those rears do look a little close to needing a change. I've kept with OEM rear pads, as they don't do much work but I might look to try some Hawk Ceramic pads for the Front, as I want to reduce dust levels. Ferodo DS2500 are often touted on here as being suitable replacements though. It's been 18 years since I used EBC red stuff, they were not a bad pad but found were heavy on discs. Back then I preferred Pagid Blues to those, but things change. As it happens OEM front Audi RS4 pads were Pagid but now taken over by Brembo and the rears are currently produced by TRW. My concern is there's a lot of online chatter about cheap 'Brembo' 'Pagid' pads being made with inferior compounds for these large retailers, I can't comment either way as have no experience with using them.

Ahhhh,

So not all holes are created equal on these? That's odd. Maybe to keep structural strength? Not have as many holes perhaps. The fronts were changed just before I got the car a few months ago. But I'd like to know the pad thickness on the front. I suspect just new discs were fitted.

The rears have got to be over 60% worn now I reckon. As I said, they were very much on my radar. But another couple of months saving would help. However, if the rear set up is totally shot then I'll replace now.

I think I'm gonna try something different on the rears when I do change. Pad wise. Nothing drastic. Just a semi-metallic. I don't track the car so cold bite-in is still needed for me personally. Hard to know what actual effects take place until you 'try' something though.

Braided lines? Seems to be 50/50 split opinion on these online. But looking at some visual back to back tests, stopping distance is reduced. Obviously there's many more factors at play in a brake set up other than just changing the lines. I get that.

I don't suppose you have pics of the fronts you fitted? To see where the dimples are? Wouldn't want unnecessary drilling haha. That would be awkward. But maybe the cleaning will unmask them anyway. Cheers Sam.


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[Thundercliffe81]

This is pretty decent from Auto Doc. Eurocar parts have them at £84! Am I missing something? The Auto Doc listing is for both rear brake pad set ups yeah? 4 pads? Such a difference in price.


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[Surrey Sam]

I believe your line of thinking about maintaining structure is most likely, perhaps due to the scalloped nature of the disc design?

Yes, got a picture below of the front discs, rears are similar too - click it to enlarge

New Discs

FYI - Audi OEM rears pads are usually £96 and the part number is 4G0698451J, they come with new pad sensor, bolts and pad sliders

Audi parts direct are currently doing them for £65 - http://www.audipartsdirect.co.uk/produc ... 4G0698451J