1sparrow
Active member
You may want to consider this upgrade. Glad I did. Now I can at least stop like a Porsche!
VW Jetta TDI & 2.0L 6/99-01 02 03 04 Brake Rotors Pads
VW Jetta TDI & 2.0L 6/99-01 02 03 04 Brake Rotors Pads
Well engine braking provides slightly better mileage, but that is not a serious issue, at least for me.1sparrow said:Hi Joe
Two schools of thought here. The extra RPM's = unused miles. Engines are more expensive than brakes. And I am not a racer of any kind. This system is just superior period. That is why they are stock on high end cars. I do not sell em', Just sharing my positive experience. They will also be on wife's Jetta soon. OMO (They just feel good)
I would also for a city driver anyway. The auto is likely to put less stress on the engine, however, I believe that in most cases the final real life rpm to mph ratio means most cars with automatics will run at a slightly higher rpm at highway speed than manuals.1sparrow said:Now my thinking is two identical cars one auto the other standard. And all things equal maintenance miles environment. I would buy the automatics motor over the standard just on the wear factor.
Anyway, I'm a fan of drilled, but that's me... my 312mm fronts and 256mm rears are all cross drilled & slotted...There are many claims as to the benefits of drilled vs slotted rotors on stopping power. This guide is intended to provide some facts about drilled and slotted rotors. As a member of the SAE (Society of Automotive Engineers), I was pleased to see a paper "The Effect of Rotor Crossdrilling on Brake Performance" by two GM engineers published in 2006. They examined three vehicle platforms with cross-drilled rotors vs standard rotors to measure convection cooling capability, fade characteristics, wet braking, pedal feel and lining wear. The result is summarized as follows:The authors also reported that drilled rotors prevent pad resin glazing on the rotor. So we now have solid evidence that drilled rotors have benefits over standard rotors. However, I have not found any published paper to show how slots affect brake output. So I reviewed inertial dynamometer tests using ISO NWI 26867 from Link Testing in Detroit with slotted rotors vs standard rotors. The results showed no significant difference in the coefficient of friction during the fade sections, hot stop section or pedal sensitivity portion of the test. My hypothesis is that slotted rotors do not contribute to rotor cooling whereas drilled rotors improve convection heat transfer to cool rotors and reduce brake fade. I should also point out that the pad lining wear for the slotted rotor was very severe during the test, i.e. the pad was chewed up over 20% more than the lining with stock rotors. While I believe that slots will help remove gas and debri from under the pad, I am not sure that this has a significant effect on brake torque for normal street driving. Perhaps the effect of slotted rotors is more significant on the race track, and conversely, I believe that drilled rotors are better for street and highway driving. For most drivers, I recommend drilled rotors over slotted rotors, and this conclusion is supported by the fact that Corvette, Ford GT, Porsche, Mercedes and BMW come with OEM drilled rotors.
- For the sports sedan, the coefficient of friction was 21% higher for drilled rotors than standard front rotors at 340F and higher using 15 brake snubs at 62mph. The track simulated 124 mph fade test showed 37% better brake output for drilled rotors. The drilled rotor brake temperature was about 150 degrees cooler.
- For the performance car, the coefficient of friction was significantly higher for drilled rotors especially at high temperature.
- Wet braking at high pedal pressure was the same for drilled or standard rotors. Wet braking is not significantly improved by drilled rotors.
- Pedal force was much more consistent with drilled rotors over the brake temperature range. That is, to stop at the same deceleration rate, the driver does not need to modulate pedal pressure based on different brake temperatures. This reduces driver fatigue and improves brake response.
I think drilled rotors look cool too but they don't make you stop shorter. I am not the most experienced or knowledgable person on the subject but I know enough and chat with people who spend thousands on brakes every season.BleachedBora said:I know some people that are not fans for the cross drilled, however neither myself nor my customers have had issues with them.
Why do you think that all the high end cars have cross drilling? There are performance benefits! Warping actually is less likely with cross drilled than it is with standard rotors. Temperatures are reduced significantly over standard rotors.
As taken from the internet:
Yes, rotor quality makes a difference.Sc0 said:Porsche and others discovered cracking issues and started using "cast drilled" rotors which solved this....In other threads it's mentioned that Brembo and Zimmerman use cast drilled rotors, dunno about the accuracy of that.
chittychittybangbang said:Yes, rotor quality makes a difference.
A lot of myths flying around, if you read my brake FAQ and read the articles it'll answer most of them. Porsche casting the holes is a myth. Even if they were, which they are not, they would still need to be machined and camfered. Read this thread:
http://corner-carvers.com/forums/showthread.php?t=21273
If you have evidence that Porsche casts the holes, contact these guys who have had a bounty for years ($500 as of 2008) to anyone who can prove Porsche casts the holes. It's never been claimed. Salesmen at the dealer don't count as evidence
That's weird.. Being a 10.1 rotor, you'd think there would be no clearance problems at all..gallaj01 said:Sort of a side note but still in the category. I upgraded to 337/20th rear vented brakes a while ago. I did this because I had a bad carrier and a bad caliper piston and was able to get the 10.1" vented rear for $150 with 20xxx mi on them off VWVortex
Anyways, the reason I am postings is a note on wheel clearance with these rear brakes. My Jetta is an '01 and has the straight. They clear the rear calipers slightly less than the front stock TDI/2.0 brakes do. The bad news is I just found out that they do not clear 15" steelies, nor do they clear the 5 spoke wheels found on 03+ TDIs.
I doubt many people will ever be in this brake set up situation, but I figured I would throw out my personal experience/warning