Rusted Drum brakes
03-08-2006, 06:43 AM
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I'm confused. What the hell are we talking about?
The handbrake drum is typically located inboard on the driveline; brake disc rotors are behind the wheels and routinely rust up in wet conditions (that's because cast iron is a wonderful heat conductor, but a lousy rust resistor). Those pics referenced in the old thread look like part of the wheel hub. On mine, that hub shines clean when the wheel cleaner is applied at the car wash (every other trip). On the off-times, it appears gray and blotchy, but never rusty.
Since I have not removed the wheels myself on this car, I'm not sure what is what, but I can tell you that, at 2 years+ old, there is no rust there.
Please clarify what/where it is that you are seeing. Maybe there is a difference in high performance brakes. I'm guessing that any rust on the wheels, hub, etc. is deposited there from the brake rotors as they are used after standing in damp climate.
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Ray Hull
The handbrake drum is typically located inboard on the driveline; brake disc rotors are behind the wheels and routinely rust up in wet conditions (that's because cast iron is a wonderful heat conductor, but a lousy rust resistor). Those pics referenced in the old thread look like part of the wheel hub. On mine, that hub shines clean when the wheel cleaner is applied at the car wash (every other trip). On the off-times, it appears gray and blotchy, but never rusty.
Since I have not removed the wheels myself on this car, I'm not sure what is what, but I can tell you that, at 2 years+ old, there is no rust there.
Please clarify what/where it is that you are seeing. Maybe there is a difference in high performance brakes. I'm guessing that any rust on the wheels, hub, etc. is deposited there from the brake rotors as they are used after standing in damp climate.
Cheers,
Ray Hull
03-08-2006, 06:54 AM
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Originally Posted by Ray Hull' post='251636' date='Mar 8 2006, 03:43 PM
I'm confused. What the hell are we talking about?
I didn't even know there was a secondary drum brake - I thought it was just discs all round (that's rotors in the USA)
03-08-2006, 07:03 AM
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Brakes and their components (excluding rubber) do rust and as long as the rotor surface is rust free or there's nothing wrong when you hit the brake it should be fine, I wouldn't worry about it too much.
As for the drum brake on your rear wheel which is used for the parking brake, they do rust also and it is recommended by BMW that you apply your handbrake only to stop the car (at a slow speed of course!) to clear the rust once in a while.
As for the drum brake on your rear wheel which is used for the parking brake, they do rust also and it is recommended by BMW that you apply your handbrake only to stop the car (at a slow speed of course!) to clear the rust once in a while.
03-08-2006, 07:07 AM
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Originally Posted by AC_S5' post='251650' date='Mar 8 2006, 04:03 PM
Brakes and their components (excluding rubber) do rust and as long as the rotor surface is rust free or there's nothing wrong when you hit the brake it should be fine, I wouldn't worry about it too much.
As for the drum brake on your rear wheel which is used for the parking brake, they do rust also and it is recommended by BMW that you apply your handbrake only to stop the car (at a slow speed of course!) to clear the rust once in a while.
As for the drum brake on your rear wheel which is used for the parking brake, they do rust also and it is recommended by BMW that you apply your handbrake only to stop the car (at a slow speed of course!) to clear the rust once in a while.
Is this a legitimate excuse when faced with the boys in blue ?(in the bad old days I once drive my ford cortina to a garage with just the handbrake after my front pistons jammed)
03-08-2006, 08:23 AM
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Originally Posted by needforspeed' post='251646' date='Mar 8 2006, 10:54 AM
I didn't even know there was a secondary drum brake - I thought it was just discs all round (that's rotors in the USA)
If a car has disc parking brakes instead of drum parking brakes, then you would see a small 2nd caliper on the rear brake, like on the Ferrari 360.
03-08-2006, 02:53 PM
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I thought the parking brake mechanically acted on the calipers or on the rear diff on some cars and SUVs - I guess this is not the case on the E60?
03-08-2006, 03:25 PM
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03-08-2006, 03:36 PM
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Originally Posted by Rudy' post='251851' date='Mar 8 2006, 04:25 PM
Ray, the parking brakes are not "inboard on the driveline," they are inside the hub area of the rear wheels, exactly where the picture below shows the rust. You have to remove the rear disc (rotor) to expose the brake shoes, etc. that are part of the drum system.
See reply above to Ray Hull...
Not necessarily. I'm not an expert on what other manufacturers are doing but in my experiences, I've found that most four wheel disc cars have a mechanical link to the same rear calipers that the hydraulic system uses. In other words, they don't use a secondary rear drum system as the parking brake. I'd bet that better, more upscale cars (like the Ferrari you mention) might have a secondary caliper but it's most likely the exception, not the rule.
Every BMW I've owned since 1989 had a secondary drum brake used for the parking brake on a four-wheel disc brake system. The E60 continues with that standard...
See reply above to Ray Hull...
Not necessarily. I'm not an expert on what other manufacturers are doing but in my experiences, I've found that most four wheel disc cars have a mechanical link to the same rear calipers that the hydraulic system uses. In other words, they don't use a secondary rear drum system as the parking brake. I'd bet that better, more upscale cars (like the Ferrari you mention) might have a secondary caliper but it's most likely the exception, not the rule.
Every BMW I've owned since 1989 had a secondary drum brake used for the parking brake on a four-wheel disc brake system. The E60 continues with that standard...
03-08-2006, 05:43 PM
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Originally Posted by needforspeed' post='251654' date='Mar 9 2006, 12:07 AM
Whoohoo official recommendation for handbrake turns Is this a legitimate excuse when faced with the boys in blue ?
(in the bad old days I once drive my ford cortina to a garage with just the handbrake after my front pistons jammed)
Is this a legitimate excuse when faced with the boys in blue ?(in the bad old days I once drive my ford cortina to a garage with just the handbrake after my front pistons jammed)
and the boys in blue will not be please 
03-09-2006, 01:01 AM
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Originally Posted by Rudy' post='251851' date='Mar 9 2006, 12:25 AM
Ray, the parking brakes are not "inboard on the driveline," they are inside the hub area of the rear wheels, exactly where the picture below shows the rust. You have to remove the rear disc (rotor) to expose the brake shoes, etc. that are part of the drum system.
So it the 'drum' is the rusty bit in the photo, the brake shoes are inside, so yanking on the handbrake to slow the car won't scrub off this rust?