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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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 Posted: Fri Mar 09, 2012 12:40 pm Post subject: Brake Caliper - Stripped. Am I screwed (No pun intended) |
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I was bleeding the brakes today and was almost done, nice and firm pedal, super happy.
Then, disaster. As I'm tightening up the bleeder, it spins. It wasn't a whole hell of a lot of pressure, it just stripped. I'm not talking the actual end of the bleeder, I mean INSIDE the caliper. I pulled the bleeder out and sure enough, bits of thread all over inside the threads of the bleeder screw. Now it won't tighten down and I have a mess all over the floor.
Can I:
- A have a place that rebuilds brakes fix it?
- B have a tap/die done and rethreaded?
There's no way I'd try a helicoil for safety reasons, but if I can fix the caliper that would be awesome.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
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- 1980 Porsche 931 (Daily)
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Fri Mar 09, 2012 1:32 pm Post subject: |
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Take it to a brake specialist.
They may be able to put a larger bleed screw in.
Otherwise look for another.
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Porsche 924 1984 (UK import) NA
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Fri Mar 09, 2012 3:11 pm Post subject: |
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Rasta and Stefan told me it's cast iron so it shouldn't have stripped. I guess I need to pull the caliper off and take a closer look.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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musicalannette
Joined: 21 Feb 2012
Posts: 413
Location: UK
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| Posted: Fri Mar 09, 2012 8:07 pm Post subject: |
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yea the guys right, it is normally the bleed screw that goes the caliper is normally allways ok, bleeds screws are more or less disposable items being down there in the road dirt. there not very big on the 924 and it would not take too much to for it to become damaged, corroded or out of shape, resulting in your problem.
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924RACR
Joined: 29 Jul 2001
Posts: 9108
Location: Royal Oak, MI, USA
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| Posted: Fri Mar 09, 2012 10:58 pm Post subject: |
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...and you're lucky to have had it strip, usually (in my experience, on other cars) they snap off and have to be extracted!!! 
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tyfighter123
Joined: 19 Jan 2010
Posts: 551
Location: Colorado
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| Posted: Sat Mar 10, 2012 3:07 am Post subject: |
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Vaughn is right I had one snap off in my rear caliper and it is a pain to get out.
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Porsche 924 1977 N/A
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Sat Mar 10, 2012 2:53 pm Post subject: |
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I've had a bleeder snap before on my ducati and got a new banjo bolt. Going to take the caliper off later and look at it on the bench where I can get some good light and make a decision.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
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| Posted: Mon Mar 12, 2012 7:16 am Post subject: |
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There`s a repair kit available in motorcycling circles that is just what you need. Have used them successfully a few times now. IIRC the bleeder thread is drilled out & tapped to 7/16" (UNF?) and the tapered end insert screwed in, retained & sealed with locktite. Then the supplied bleed nipple simply screws into the adapter.
Look around for alternative & local sources but this is what they look like:
http://www.ebay.com/itm/USA-MADE-Front-Rear-BRAKE-CALIPER-BLEEDER-SCREW-REPAIR-KIT-ALL-HARLEY-s-/130654815201
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bkantelis
Joined: 07 Nov 2005
Posts: 50
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| Posted: Mon Mar 12, 2012 8:30 am Post subject: |
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you can check out used on www.car-part.com
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Brendan
Joined: 04 Jan 2011
Posts: 63
Location: Maine USA
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| Posted: Tue Apr 17, 2012 9:20 am Post subject: |
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I'm using one of these right now. Works ok. They are made by a company called thexton in MN, I believe. Seems like Dorman and everyone else buys em from them. The bleeder screw is tiny and fitment isn't that great. but it does work.
Read up on tapping cast iron before you start. It's not the same as steel. I did mine dry with a lot of compressed air to clean out the chips (yes, chips) and it cut beautiful threads. |
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sciroccosteve
Joined: 16 Apr 2012
Posts: 215
Location: Rochester, NY
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| Posted: Tue Apr 17, 2012 9:51 am Post subject: |
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I can easily see your bleeder being stripped:
have you tried to put a new bleeder in? There is no way (in my mind), that the bleeder material stripped out the caliper material. (simple geology...the bleeder is made of a less hard material than iron, the caliper)
Interested to see what happens with this, either way
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Brendan
Joined: 04 Jan 2011
Posts: 63
Location: Maine USA
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| Posted: Tue Apr 17, 2012 10:29 am Post subject: |
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Another interesting thing I learned:
The caliper that I used that bleeder rig on was a factory rebuilt unit. Mine stripped out because Centric, the rebuilder, drilled and tapped the caliper for a bleeder through a snapped off bleeder screw. When my 'caliper' threads stripped out, they came out in pieces that revealed the factory threads behind the newer threads, which Centric cut into the bleeder screw steel. |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Tue Apr 17, 2012 1:54 pm Post subject: |
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| sciroccosteve wrote: | I can easily see your bleeder being stripped:
have you tried to put a new bleeder in? There is no way (in my mind), that the bleeder material stripped out the caliper material. (simple geology...the bleeder is made of a less hard material than iron, the caliper)
Interested to see what happens with this, either way |
Unfortunately it actually was the case that the bleeder was perfectly intact and the material in the caliper stripped out. The threads literally crumbled like a crouton. Never seen anything like it.
I ordered a caliper repair kit which basically enlarges the threads to a bigger size, inserts repair kit with a new banjo bolt. I'm waiting for the repairs still.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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sciroccosteve
Joined: 16 Apr 2012
Posts: 215
Location: Rochester, NY
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| Posted: Wed Apr 18, 2012 7:33 am Post subject: |
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| CorsePerVita wrote: | | sciroccosteve wrote: | I can easily see your bleeder being stripped:
have you tried to put a new bleeder in? There is no way (in my mind), that the bleeder material stripped out the caliper material. (simple geology...the bleeder is made of a less hard material than iron, the caliper)
Interested to see what happens with this, either way |
Unfortunately it actually was the case that the bleeder was perfectly intact and the material in the caliper stripped out. The threads literally crumbled like a crouton. Never seen anything like it.
I ordered a caliper repair kit which basically enlarges the threads to a bigger size, inserts repair kit with a new banjo bolt. I'm waiting for the repairs still. |
That is just wild. Good luck with the new threads dude 
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1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
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