Gelochte Bremsscheiben sinnvoll ? | Posts 16+

'Until Saturday, my A4Q (8D5) had 312mm brake discs on the front (original Audi equipment) and Ferodo DS2500 pads all around.'


Hello Stefan,

Do the 2500 models also have an operating permit (ABE)?

Regards,

Tobias.

Hi,

My experiences with brakes:

ATE Powerdisc:

I was still using these ATE Powerdisc brake pads until two weeks ago. They lasted for 80,000 km, and I certainly wasn't driving gently.
The reason for purchasing them was a) they were cheaper than the original VW parts, and b) I wanted to achieve better braking performance even in wet conditions. Of course, I also installed the matching ATE brake pads!

To be honest, I didn't notice any improvement in the brakes.
So, I wouldn't expect them to have any miraculous effects.

Perforated discs:

I heard that there are manufacturers who drill the holes.
Since then, that chapter is closed for me. If I buy perforated sheets, the manufacturer should assure me that the holes were not drilled.
(The drilling process creates stresses in the material, which, combined with heat generation, can lead to cracks.)

We have an A-class parked outside with brake discs that come standard with holes, and the braking performance is noticeably better than my old ATE Powerdisc brakes, even though they are a similar size.
... unfortunately, I can't provide any precise data. Only subjective impressions.

Miscellaneous brake parts!

I've found that stainless steel brake lines combined with this DOT 5 brake fluid result in a wonderfully controllable braking system. The pressure point is very clear, and... I can only recommend it to everyone. That being said, of course, it doesn't make much difference when it's wet.

Perhaps this sounds like comparing sparrows to cannons, but I can imagine that the A6 2.5 could potentially be fitted with brakes from a more powerful model. After all, there's the RS6! That's what I would investigate further. And then there wouldn't be any problems with the TÜV (German technical inspection agency) if those brakes were originally installed on the same car as standard equipment.

Greetings.
Thomas.

As far as I know, DOT5 only has a higher boiling point. You shouldn't reach the boiling point of DOT4, because something else will likely break in the braking system before that happens. Of course, you should still adhere to the recommended replacement interval of 2 years.

Regarding slotted brake discs: so far, I've only heard good things about Zimmermann.

Hi,

Interesting. I always thought that was related to the tendency of substances to form water.
Or am I getting something mixed up here?

Greetings.
Thomas.

Hmm.

Okay, if brake fluid boils, it needs to condense back into a liquid state. This process leaves water behind. The boiling point of DOT5 is higher, so you can assume that DOT5 is less likely to form water, simply because you probably won't reach that temperature range on the road (I suspect). The tendency of DOT4 to form water increases with age, meaning its heat resistance decreases. That's why it should be changed every two years.
Okay, that would be my explanation .

Brake fluid is generally hygroscopic, meaning it absorbs water from the environment. Over time, more and more water accumulates in the brake fluid, which lowers the boiling point of the mixture. This can lead to situations where gas bubbles form, reducing the braking effect to near zero.
While DOT 5 has a higher boiling point, it will eventually also reach the critical range, just later than other fluids.
If you adhere to the recommended replacement interval for DOT 4 brake fluid, nothing usually happens. Since fluids, and especially brake fluid, are generally incompressible, the pedal feel should remain consistent.

Hi you two,

Thank you for the explanations. If I understand correctly, is it possible to use DOT 5 brake fluid for a longer period than DOT 4?

I have one more question. Due to my high annual mileage, I've already driven over 80,000 kilometers (approximately 50,000 miles) in my Golf in just two years.
I'm going to change the fluid soon, but only out of curiosity.
I know you can test the water content, but it's only a rough estimate. Is there also a mileage limit after which you should definitely check it at least once?

Is there a minimum clearance requirement between the brake caliper and the rim that must be maintained?

Thank you again.
Greetings.
Thomas.

Normally, you can't use DOT5 brake fluid for an extended period, especially if you want to continue benefiting from its main advantage, which is its higher boiling point.
What makes a difference are the stainless steel braided hoses, because they don't expand or flex, which can improve the pressure point.
However, I'm not sure if it's as simple to fill DOT5 fluid into a DOT4 system, like in a Golf3. There must be something that achieves the higher boiling point, otherwise, there's a risk that the fluid could damage the seals (just a thought!).

Regarding a mileage restriction, I don't know anything about it. Just have it checked; it usually doesn't cost anything.

Hey everyone,

I've now installed the Powerdisc rotor, along with Jurid brake pads, because I couldn't find any ATE pads at a wholesale price. (And if I had bought them normally, the pads would have been more expensive than the rotors.)

Powerdisk brakes are definitely better than the original Audi ones. The car brakes smoothly. The delay when braking on wet roads is gone. I'll have to wait until next winter to see how they perform in salt conditions. However, I haven't noticed any of the 5-second pauses mentioned above.

In such cases, I would immediately replace the brake pads and rotors.

Even if the power disc only lasts half as long as the originals, what's the big deal? First of all, it costs almost half as much, and secondly, good braking performance is important to me.

Furthermore, the windshields on my C-Class cars have always only lasted for 60,000 kilometers. And considering that the windshields on my Audis are still going strong after 5 years and 170,000 kilometers, it probably wouldn't have been so bad to replace them earlier.

The nice, crisp brake feel comes from the new pads. The old ones were deteriorating due to corrosion. This makes the pads soft and compressible. Eventually, this can get so bad that even with sufficient pad thickness, the pad will tear away from the backing plate, and you'll suddenly be braking directly on metal. This is what happened in my C-Class.

I bought the Powerdisk from DUW.

Hi,
I'm glad you didn't get any ATE brake pads. Mine failed after only 7,000 km and with hardly any visible wear.
I also installed the Powerdisk and thought it would work better if everything came from the same manufacturer.
The brake pads initially had a very long break-in period, approximately 1000 km, during which the braking performance was absolutely terrible for the first 200 km. The reason for the expensive replacement was fading. After just one braking maneuver from 140 km/h on the highway, the effectiveness would already decrease noticeably. However, when driving from the Lötschberg mountain pass down into the Rhone Valley this year, as in previous years, using some engine braking, I couldn't activate the ABS system in the valley because the braking performance had deteriorated so much.
They also squeak quite often, by the way.
Now I have the original Audi brake pads back in. They are from Textar, but I couldn't find them as easily in the aftermarket parts stores.
The new brake pads required less pedal force immediately after installation compared to the ATE ones. Of course, I haven't been able to test their fade resistance yet, given the relatively short distance I've driven so far.

I was very satisfied with the Ferodo DS2000 pads. The fade compared to VW pads with a VW rotor was significantly less, but it's important to note that the braking performance really improves as the pads heat up; right after starting, they weren't great. The pads simply needed a certain temperature. I used them with standard VW rotors.

Hello!

I can only confirm the experiences of Christians.
It was the same for me with the power discs and the ATE brake pads.

I also bought some Ferodo DS2000 brake pads.
I'm excited.

See you later.
Greetings.
Thomas.

Hi,
Do the DS2000 brake pads have a General Operating Permit (ABE)? Are these "special" pads, or are they the standard ones that ATU offers for my car?

Hi,

As far as I know, the DS2000 are the only brake pads from Ferodo that have an EU approval (ABE).
But will ATU actually install it?

See you later.
Greetings.
Thomas.

ATU sells them. However, they don't install them as standard equipment if you go with the regular options; they cost three times as much as the Jurid brake pads that ATU normally installs! (At least, this is true for the Golf.)

"I believe they are truly the only ones with road approval (according to German traffic regulations). It's possible that the DS2500 still has it. However, anything from Ferodo with a higher number is increasingly geared towards racing brake pads. This means that these pads have almost no effect when the brakes are cold, which is why they lack road approval, for example, in the case of the DS5000, as far as I know."

Hi,

The DS2500 models are not street legal.
I believe these DS Performance products, or whatever they're called, will also be sold with an approval certificate (ABE).
But that was probably all there was to it. There really aren't many of them.

Greetings.
Thomas.