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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Mon Nov 26, 2018 8:50 am    Post subject: Stuck handbrake? Reply with quote

Hi all

Driving home on Friday (last time before being taken off road for winter!) the car made a horrible clonk/thud noise before feeling like I was dragging 10 bags of sand behind me.

Luckily I was less than a minute from home, pulled onto the drive and the left rear stopped rotating and dragged across the gravel. The right rear also started spinning up - probably due to the gravel and the left being held.

Under closer inspection the disc and painted bit had tinted a blue colour. This tells me it got very very hot! See photo.

Due to a busy weekend I’ve not had much chance to look at it. Planning on “working from home” tomorrow so inevitably I’ll get an hour to start breaking it apart.

What’s people’s thoughts? Failed/stuck handbrake? Caliper? Worse?!

Assume best course of action is wind the handbrake back and get the caliper off and disc?
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6979
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Mon Nov 26, 2018 9:04 am    Post subject: Reply with quote

Check for obvious things like seizure of calipers (you should be able to spin the rear wheels by hand with the car jacked up) but it sounds a bit like a fault with PSM, which is braking a rear wheel to stop it rotating.
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Wh1t3Kn1ght
Silverstone


Joined: 22 Aug 2018
Posts: 147


2001 Porsche 996 Carrera 2

PostPosted: Mon Nov 26, 2018 9:05 am    Post subject: Reply with quote

Howdy - sounds like the rear brake shoes for the handbrake have somehow got stuck against the inside of the disc...

How does the handbrake engagement feel?

Pretty odd though as the mechanism requires a pulling force to be applied to engage it e.g. lifting the handbrake handle to tighten the cable. So you'd expect it to fail in the open / released position.

The only thing I can think of it catastrophic failure of the brake shoe retaining mechanism and the shoes have jammed. Do let us know what you find!
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Marky911
Indianapolis


Joined: 04 Jun 2009
Posts: 2324



PostPosted: Mon Nov 26, 2018 10:47 am    Post subject: Reply with quote

Yeah


Something in the drum part of the has jammed. If they're old shoes then maybe some material has crumbled off and jammed, or again if old, a spring may have snapped and wedged itself.

I'm sure it'll become obvious once you whip the disc off. Thumb
 
  
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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Mon Nov 26, 2018 11:08 am    Post subject: Reply with quote

Thanks all, seems like some possibles.

Not sure fixing the PSM is a driveway/garage job! Yikes!

Hopefully it’s just handbrake related - will get it off tomorrow and post some pics!
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6500
Location: Brighton


PostPosted: Mon Nov 26, 2018 7:58 pm    Post subject: Reply with quote

The material on the handbrake shoes can break off .. this in turn jams the brake disc .. yours is pretty excessive .. in fact the worst ive ever seen Surprised

Disc off and see whats going on with the handbrake shoes .
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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Sun Dec 16, 2018 10:38 am    Post subject: Reply with quote

deMort wrote:
The material on the handbrake shoes can break off .. this in turn jams the brake disc .. yours is pretty excessive .. in fact the worst ive ever seen Surprised

Disc off and see whats going on with the handbrake shoes .


Finally got around to removing the disc...pictures speak for themselves!

Going to renew both sides as I assume the other side will be a similar condition...
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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Mon Dec 17, 2018 3:20 pm    Post subject: Reply with quote

UPDATE...

Popped the new shoes in, both sides and all went well. Adjusted handbrake, all fine.

Took it out for a drive and then bang, same horrible sounding noise as before and the car ground to a halt.

A 15min wall home and tools in the other car allowed me to whip the wheel and disc off again to discover something else had broke (see attached).

Snapped clean off and had got itself wedged inside the disc. Everything went back together dead easy but clearly the spring plate thingymajig must’ve been weakened from the first failure of the shoe.

Lesson learnt - buy new handbrake hardware!!

Managed to free it up and drive home. Just no handbrake. So it’s been cleaned and tucked away in the garage now until well into next year on its winter hibernation. Too cold to be sat spannering on the driveway. Will order the bits and await a 10deg.c day!
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All went together fine, even had time to repaint the disc!
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FA6A815C-BAC6-45C5-90AB-2BD2B59DB494.jpeg
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This is the offending pivot plate that has snapped. (Photo of original shoe failure).
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6500
Location: Brighton


PostPosted: Mon Dec 17, 2018 8:17 pm    Post subject: Reply with quote

Erm .. er .. im not totally sure .. but im not sure that part is replacable .. i think its part of the hub Sad
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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Mon Dec 17, 2018 8:27 pm    Post subject: Reply with quote

deMort wrote:
Erm .. er .. im not totally sure .. but im not sure that part is replacable .. i think its part of the hub Sad


It’s this part...

https://www.design911.co.uk/mobile/#part;id=6765

If they sell it as a part then assume it must be able to be removed?!

I hope!
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6500
Location: Brighton


PostPosted: Mon Dec 17, 2018 8:48 pm    Post subject: Reply with quote

Aghh okies .. i thought it was the ally bracket the shoes rest on .. thats part of the hub .. the link is for the mechasnism that operates the shoes .. that is seperate and easily replaceable .
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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Mon Dec 17, 2018 9:08 pm    Post subject: Reply with quote

deMort wrote:
Aghh okies .. i thought it was the ally bracket the shoes rest on .. thats part of the hub .. the link is for the mechasnism that operates the shoes .. that is seperate and easily replaceable .


Phew! That’s reassuring, thanks deMort.

Going to replace both sides anyway, just as a precaution. Wouldn’t want it failing at motorway speeds Surprised
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6500
Location: Brighton


PostPosted: Tue Dec 18, 2018 8:30 pm    Post subject: Reply with quote

If your unsure about anything like this then post or send me a picture of the damage .. that way i can actually see whats going on Smile

De.Mort@virginmedia.com

Just in case you ever need it .
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Gooey36
Silverstone


Joined: 23 Aug 2017
Posts: 110



PostPosted: Thu Dec 20, 2018 1:07 pm    Post subject: Reply with quote

deMort wrote:
If your unsure about anything like this then post or send me a picture of the damage .. that way i can actually see whats going on Smile

De.Mort@virginmedia.com

Just in case you ever need it .


Thanks DeMort, I may take you up on that! Thumb
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