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So I drove with parking brake on for like a half mile..

Gosh embarrassing as I havenít drove the 930 in nearly 8 months..

Out of practice I guess..

Anyhow I didnt realize until the back wheel started vibrating..

Yes the parking brake is cooked.. barley works.

Wondering if I also managed to cook my rear axle bearing too..

I now have a squeal from the right rear wheel that starts at 5 mph and goes away at 20 mph.

I know I now have a appointment with the porsche mechanic..

What Iím asking is there anyone with mechanical experience on these 930s that can advise me if Iíve probably cooked the wheel hub bearing and I should NOT drive to the mechanic?

Iím asking because I deeply distrust towing companies when comes to towing a air cooled porsche.


Last edited by 93097004xx; 08-24-2019 at 04:31 PM..
Old 08-24-2019, 04:13 PM
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A half mile at what speed?
I seriously doubt you've harmed the bearings.
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Old 08-24-2019, 04:53 PM
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45 mph or so I started limping once I realized something wasnít right..




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Old 08-24-2019, 04:57 PM
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So I drove with parking brake on for like a half mile..

Iíve had a rear hub bearing go once.. I was 100 miles from home..

Sounds like a unbelievable crunch grinding sound..

You only have to have something like that happen once before you refuse to ever drive very far from home (or porsche mechanic) again..

This does not sound like that.. It sounds like a faint squealing that is only audible from 5 mph to 20 mph..

I did ruin my parking brake which sucks but the reality is Iím needing to get the entire braking system rebuilt in the spring with new tires..

I guess now a new parking brake is on the list to..

Itís my mistake and itís salty that I can put so much effort and $$$$ in this and then go make a stupid mistake like driving with the parking brake on..




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Old 08-24-2019, 05:18 PM
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The squeal may just be the shoe being out of round, and will wear that high spot away soon enough. Possibly no real harm done.

If you say the parking brake now hardly works, it may still be possible that there is no real harm done. You can try to readjust it. But if that doesn't work, then replace the shoes.

Unlikely the wheel bearing suffered because of your error.

BTDT.
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Old 08-24-2019, 07:26 PM
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Thanks! Unfortunately even adjusting the parking brake for me requires my mechanic..

Although I know itís a simple task I wonít pull the wheels off or remove calipers rotors ect..

I appreciate the responses!

Nice to have knowledgeable folks on here.




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Old 08-24-2019, 07:38 PM
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One possibility for the noise you've described would be a broken shoe spring that's hanging loose and dragging on the drum. I put up with the same noise for quite some time before pulling things apart and finding one of the springs broken. A cheap and easy fix.
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Old 08-25-2019, 05:25 AM
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Quote:
One possibility for the noise you've described would be a broken shoe spring that's hanging loose and dragging on the drum.
This is my suggestion as well. When I first received my gray slant it squeaked all the way home. Pulled the hubs and found both springs broken. It is unfortunate that you cannot pull it apart as I'm sure it's an easy fix. Don't think for a moment you're the only one that has ever done this, probably everyone has at least once, especially if you only pull the hand brake a couple clicks. The only "cure" for not driving with the brake dragging is to set the brake hard enough that the engine cannot pull away without it being obvious that the rear wheel brakes are on.
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Old 08-25-2019, 10:11 AM
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The other cure would be to wire a buzzer or chime in line with that often overlooked warning light on the dash. I admit that I'm half blind sometimes and just drive away.
Old 08-25-2019, 10:57 AM
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Seriously doubt you have harmed anything other than the parking brakes....

but after 8 months of inactivity, consider yourself lucky nothing else has gone wrong. I wouldn't expect to just jump in, start the car and drive.
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Old 08-25-2019, 11:21 AM
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I have found that if I park the car covered in the garage for a week or two with the emergency brake engaged It will squeak like crazy for a while on the first drive. I took it apart a couple of times and tried to adjust and lube but had no effect under these conditions. Now I just block the wheels when storing and use the brake when parked with no problems doing it this way.
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Old 08-26-2019, 04:43 AM
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don't beat yerself up, just yest I did it for 1/4mi until I heard squeaking

course, it's easy to do when it barely grabs @ full pull (Rawknees) - couldn't really tell it was on

barely grabs @ full pull... from... pulling it while WOT after passing Johnny Law @ like a trillion... whoops. Not the first time / not the last time. D'oh 8-)

can adjust it pretty easily tho, try DIY 1st?
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Old 08-28-2019, 04:47 PM
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I did it recently. With turbo horsepower I didn’t even know it. I smelled something but it wasn’t til another Porsche driver came up beside me and yelled that my rear wheel was on fire that I realized it.

All that after I had just replaced the brake shoes and disks last year when I found the shoes were gone.

Interesting tidbit: the 930 parking brake shoes part number is superseded with a 997 part number. I guess if it isn’t broke...
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Old 08-31-2019, 09:35 AM
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You just have to get in the habit of setting the brake hard and not just a couple clicks until the car stops rolling. The rear will really squat down when you try to take off with the brake full on, you figure it out real quick.

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Old 08-31-2019, 11:17 AM
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