Changed a flat today on the BMW 745i - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-21-2006, 04:24 PM   #1
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Default Changed a flat today on the BMW 745i

The rear rotors are HUGE. Much bigger than even front rotors on my previous GXP? Why dont GM use bigger rotors on ther cars?
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Old 10-21-2006, 04:51 PM   #2
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Too much rotating mass? They have different(maybe better) calipers than the BMW? Just a few things that crossed my mind is all. Is a 745i RWD? Is it a heavy car?
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Old 10-21-2006, 05:33 PM   #3
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$$$$$ Large Rotors=Expensive.
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Old 10-21-2006, 05:49 PM   #4
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GM engineers have designed their brakes to provide enough stopping capability in their cars. I'm sure there are regulations that stipulate stopping distances relating to speed and the required rotor sizes.

As long as those conditions are met, then there is no problem.

That and rear brakes only do 25% or less of the stopping, so why the need for huge rotors?
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Old 10-21-2006, 05:51 PM   #5
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don mattah if baby got back its what baby got up front that mattah.
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Old 10-21-2006, 05:58 PM   #6
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Quote:
Originally Posted by Jim W
GM engineers have designed their brakes to provide enough stopping capability in their cars. I'm sure there are regulations that stipulate stopping distances relating to speed and the required rotor sizes.

As long as those conditions are met, then there is no problem.

That and rear brakes only do 25% or less of the stopping, so why the need for huge rotors?
Because the fronts are even bigger still..

BMW'* are built to perform, plain and simple. Their cars NEED to be able to go and stop on the autobahn. I remember where the german on the board had a GXP and the huge problem locals "found" with the car, was the braking.
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Old 10-21-2006, 06:03 PM   #7
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Quote:
Originally Posted by trbomk3
$$$$$ Large Rotors=Expensive.
X2
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Old 10-21-2006, 06:53 PM   #8
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Quote:
Originally Posted by BonneMeMN
Quote:
Originally Posted by Jim W
GM engineers have designed their brakes to provide enough stopping capability in their cars. I'm sure there are regulations that stipulate stopping distances relating to speed and the required rotor sizes.

As long as those conditions are met, then there is no problem.

That and rear brakes only do 25% or less of the stopping, so why the need for huge rotors?
Because the fronts are even bigger still..

BMW'* are built to perform, plain and simple. Their cars NEED to be able to go and stop on the autobahn. I remember where the german on the board had a GXP and the huge problem locals "found" with the car, was the braking.
hah, no kidding, our cars were meant to do 100+ stops all the time, i know with mine i did one and I had smoke coming out my wheel wells ...BMWs from what I have heard have some of the best brakes on any automobile. And I think second best would be Audi/Porsche or Mercedes Benz
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Old 10-21-2006, 09:52 PM   #9
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Quote:
Originally Posted by Jim W
GM engineers have designed their brakes to provide enough stopping capability in their cars. I'm sure there are regulations that stipulate stopping distances relating to speed and the required rotor sizes.

As long as those conditions are met, then there is no problem.

That and rear brakes only do 25% or less of the stopping, so why the need for huge rotors?
But why be just "good enough" for a Pontiac flagship?
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Old 10-22-2006, 11:09 AM   #10
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Because its the North American way...especially when it comes to building things.

"BCAC" buy cheap and crappy.

I've seen some of the finest design come out of North America, but when its time to build, it all comes down to making sure it meets code/regulations/standards and cost effectiveness.

Even if it is a flagship.
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