Bremsentuning? | Posts 48+

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Hi.
I had a similar experience years ago with a Fiat, I think it was a 127.
It just snapped off, at a low speed, without any sudden braking, just a 'crack' and it was gone.
Without any warning whatsoever.
The brake was definitely not stuck or difficult to operate.
It wasn't a modified or aftermarket brake, but the original one.
After that, I only replaced the rotor, and the brakes worked perfectly.
Back then, even though there was nothing visible, I suspected a casting defect.
Best regards, Frank.

Hi,

Quote:

Leiter QS u. Bachelor of Engineering.

Does he hold two positions within the company, or was he simply unsure of how to highlight the fact that he's a highly accomplished graduate engineer who earned his degree from a vocational academy?

These are my favorites...


Regards,
Micha (or should I now include my titles?)

Ouch . In the first picture, I initially thought, 'Aha, a spacer.' Maybe I should wear my glasses more often...

I find Zimmermann's response to be simply outrageous. Just that alone would make me consider talking to a lawyer. What he's saying about the uneven wear is, in my opinion, complete nonsense. The brake pads on a floating brake caliper cannot wear unevenly if the rotor looks good on the outside, because, as far as I'm concerned, there are essentially only two possibilities:

- Piston stuck or difficult to move , poor or no braking performance but consistent, both internally and externally.

- Saddle stuck in the guides or difficult to move }, resulting in uneven pressure distribution; on the outside, there is either no effect or a poor effect, and corresponding differences in the load distribution on the inside and outside.

Das Tragbild der Scheibe aussen ist aber sehr gut, ergo ist die Bremse IMHO i.O. Ausserdem ist es ja ein leichtes, die Funktion der Bremse zu prüfen, das schon beim Zerlegen und nach Einbau von neuen Scheiben u. Also, linings as well.

Regarding the nonsense about corrosion, I'd rather not say anything, as the way it's phrased is already an outrageous insult!

Hi,

Why go to a lawyer? It costs money, takes forever, and if expert opinions need to be prepared, it's all very complicated.

The appropriate contact person in this case is the arbitration board. They will issue an expert opinion and a binding arbitration ruling, which applies to member companies (hopefully Zimmermann is one of them).

Regards,
Sure, here is the translation of the text from German to English:

"Micha"

Mephisto wrote:

Does he have 2 functions within the company, or did he not know how to draw attention to the fact that he is a very talented graduate engineer who obtained his degree from a vocational academy?

As a Bachelor's degree graduate, one is legally obligated to put "(BA)" after their name, because otherwise, one would be implying that they have an even higher degree. At least, that's what we were told...

BA = Bachelor's degree; that's the reason it's there.

BA = Bachelor; that is the reason why it is there.

Incorrect. It should be either 'Diplom-Ingenieur' or 'Bachelor's degree.'

The traditional diploma program is being phased out in favor of the Bachelor's/Master's system.

As Mephisto correctly pointed out, a 'Diplom-Ingenieur (BA)' is a graduate of a vocational academy.

Aha.

You never stop learning.

I also expected it to be a Bachelor of Engineering (B.Eng.). Well, one should have known that BA and Dipl.-Ing. are not used together.

Thank you.

hiho

The brake disc probably had a crack since the summer.

'The day before, I was still in Trier, and I was driving significantly above 180 km/h in some sections.'

Okay, so when going down the Trierer Berg, I heard a clicking sound at the front (like a broken dust shield). At home, I disassembled everything, and after pushing the brake caliper back, the noise disappeared. It was probably just dirt or something. I also thoroughly checked the rotor for cracks, but found nothing. Then, on Sunday, I went for a ride, and after a test brake, I heard the clicking again, and there was no braking effect.


http://mitglied.lycos.de/officekeil/Marc/zimmermann/ a few more nice pictures.

Hi,

@Ulf:
You can do this 20 times in a row, and it always yields the same result. What's strange is that you can hear a slight squealing of the tires and also see a very faint black mark on the asphalt. Nevertheless, you don't hear or feel anything from the ABS at all! Furthermore, I'm surprised that it's the same with the Focus. So, I can't really believe it's a design flaw. On the other hand: From a safety perspective, it's _DANGEROUS_.

Regards,
Micha

Hello,

'I had the same problem with my 74 kW car. It even happened to me twice, while I was driving on the highway at 180-200 km/h and had to brake sharply. The brake pedal sank about 3 cm during braking. I quickly took my foot off the pedal and put it back on, and everything was normal again. Additionally, I was never able to activate the ABS, not even at 100 km/h. It only activated if I simulated a panic braking situation, which triggered the brake assist system. Shortly after these two incidents on the highway, I started hearing a single 'tick' sound every time I braked, up to 60 km/h. Since everything seemed to be fine with the brakes at that point, with no leaks and no error codes, I started investigating.'
Dabei bemerkte ich das die hinteren Bremssättel irgendwie ganz schön viel Spiel in ihren Führungen hatten. Komisch, dachte ich mir. So prüfte ich die Bremssättel bei einem anderen 74kwler, aber mit Bj. 05/2005. Meiner ist Bj. Anfang ´04. Siehe da, bei dem neuren Modell sitzen die Sättel fester. Somit habe ich beide Bremsen zerlegt, und stellte fest, daß sich beim neuen Modell die Bremsträger geändert hatten. Zum einen sind diese irgendwie dicker, und die zwei Führungsbolzen sind auch anders. Bei mir hatte der obere Führungsbolzen in der Führung spiel, der untere war spielfrei. Bei dem vom Bj. ´05 war´s andersrum. Also ab ins Lager zu VW und siehe da, meine Bremsträger haben sich ersetzt auf die vom ´05er Modell. Habe mir zwei bestellt, eingebaut und mich sehr gefreut. Zum einem ist diese 'Tock' weg, und zum anderem habe ich irgendwie mehr Bremsdruck. Man muß nicht mehr so auf das Pedal treten das was passiert. Und der Bremsattel sitzt auch fest, mit normal spiel, wie es jeder hat. Für mich hat es sich zum positiven verändert und ich erkläre mir das nur so, daß sich aus irgendeinem Grund die Beläge auf dem alten Bremsträger verkantet haben, oder so, und damit nicht der volle Bremsdruck auf die Scheibe übertragen werden konnte. Oder The brake caliper jammed in its guides.

The speech referred to the Polo 9N model, not the 9N3 model.

Oh, the brake calipers were free for me - thanks to the warranty!!!

Best regards, Christian.

Hi,

to ride that one last time.

Quote:

As a Bachelor's degree graduate, one is legally obligated to put "(BA)" after their name

.
Yes, that's correct, but that's not what I was getting at.

I find the way they phrase it, "Head of Quality Assurance and Dipl.-Ing.," absolutely ridiculous. The "Dipl.-Ing." simply doesn't belong there.
If we're going to do something, let's do it right.

"Sincerely,"
Achim Kerstan, Dipl.-Ing. (Bachelor of Arts)
Head of Quality Assurance.

But if Achim () signed it by hand, then it's also out of place there. It's quite funny how some people try to force their title into things (e.g., even phone books) and end up making a complete mess of it. Sometimes, less is more.

Regards,
Sure, here is the translation of the text from German to English:

"Micha"

isar12 wrote:

- Modify the brake booster (increase vacuum or use a larger one). while the latter is not associated with a longer pedal stroke as the only measure. Bitte gib mir den deutschen Text, den du übersetzt haben möchtest. Then there's the brake booster itself. Does anyone know from the parts specialists what differences VW/Audi used here?

*warming up*

I did some research: according to the records, all 9N Polo models have a 8.5" brake vacuum booster, while some G4 models have up to a 10". This means a calculated 38% more boosting power with the same vacuum pressure.

In my opinion, the description leaves very little room for design flexibility regarding the maximum level of support provided (during emergency braking).
My other systems that rely on vacuum pressure (especially the VTG) show no abnormalities that would indicate insufficient vacuum pressure.

What is the potential range for increasing braking performance when using the SBB/BS material combination in parts that already have an ABE (German approval certificate), in terms of magnitude?

Is it possible that the braking force, with increasing hydraulic pressure, stops increasing after a certain threshold, even though the tires are still rotating? I kind of have that feeling when I do a strong full stop, then a very strong one, and then a very, very strong one .

Quote:

Is it possible that the braking force, with increasing hydraulic pressure above a certain threshold, no longer increases, even though the tires are still rotating? I kind of have that feeling when I do a strong full-brake, then a very strong one, and then a very-very strong one. icon_rolleyes.gif icon_question.gif

I am familiar with this phenomenon from my experience with the Golf 3 TDI.

In all cases, original brake pads from were installed (at that time, they were from Jurid). The pads still had about 50% of their lining material, but due to the significantly decreasing friction coefficient with increasing temperature, they were unusable for my driving style, and they started to vibrate, which indicated hardening. After replacing them with a house brand, everything was fine until they reached the wear limit.

Pagid house brand?

@Teileklaus -- you were very attentive .

You're welcome.
Judging by your fuel consumption, could it be that your tires are overheating because you're not braking? Perhaps someone else is experiencing a similar problem where their tires wear out quickly.
It's a balancing act when it comes to the requirements placed on SBB.
I removed the EBC Blackstuff pads because they "don't provide enough braking power when cold," and I barely noticed that they perform better when hot and can withstand the heat of the rotors. (The pads had a blue coating).