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69mightyfine
Samba Member
Joined: August 17, 2011
Posts: 34
Location: Portland, Oregon
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 Posted: Sat Aug 27, 2011 9:02 pm Post subject: Brake drum turning specs |
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I took the rear brake drums in to the FLAPS to have them turned. They didn't have specs for min/max diameter for my 1969 bus. Is that info online, or part of the collective knowledge?
Thanks! |
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sat Aug 27, 2011 9:51 pm Post subject: |
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Rear brake drums are becoming difficult to find. I would not let a flaps touch mine.
tp |
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69mightyfine
Samba Member
Joined: August 17, 2011
Posts: 34
Location: Portland, Oregon
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| Posted: Sat Aug 27, 2011 10:06 pm Post subject: |
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| Tom Powell wrote: |
Rear brake drums are becoming difficult to find. I would not let a flaps touch mine.
tp |
What's a better option? |
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EZ Gruv
King of Plaid
Joined: December 10, 2002
Posts: 8544
Location: Las Vegas
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| Posted: Sat Aug 27, 2011 10:13 pm Post subject: |
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Your local VW mechanic.
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Eric
1977 Deluxe Westfalia - 2.0L FI Type IV, Completely Original
Photographer for HotVWs, VolksWorld, AirMighty, VW Camper & Commercial, Hayburner, and more.
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sat Aug 27, 2011 10:21 pm Post subject: |
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| 69mightyfine wrote: |
| Tom Powell wrote: |
Rear brake drums are becoming difficult to find. I would not let a flaps touch mine.
tp |
What's a better option? |
That's a good question. I would do a visual to see if there is any obvious uneven wear. If not then use a micrometer or caliper to check for uneven wear. If not then use them as is. Or just use them as is and check for pulsing. If they don't feel good then take them to a machine shop or a brake shop. I would use Midas before a flaps. It is a matter of care and training. Flaps may just take off material until the job is finished. Midas might be a bit more careful with the job especially if they are told that the drum is almost irreplaceable. There are none in the classifieds.
Aloha
tp |
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69mightyfine
Samba Member
Joined: August 17, 2011
Posts: 34
Location: Portland, Oregon
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| Posted: Sat Aug 27, 2011 10:34 pm Post subject: |
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| Thanks for those recommendations. I don't have that much confidence in my local Midas store, but I do know a good VW shop. I'll pick up the drums tomorrow.... the FLAPS didn't have anyone to turn them until Monday, so they are untouched. |
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sat Aug 27, 2011 10:39 pm Post subject: |
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There are VW people at my local Midas and they would understand the concern.
tp |
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fusername
Samba Member
Joined: March 15, 2006
Posts: 2897
Location: Boston MA
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| Posted: Sat Aug 27, 2011 10:58 pm Post subject: |
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I wouldn't touch midas, but that is only because of my experience with teh local shop. maybe they aren't all run that way. Most drums have a Max diameter in the casting somewhere inside the drum, have you looked for this?
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| Maybe Ben Pon's ghost comes and vomits NOS stampings for your bus, but not mine! |
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Desertbusman
Samba Member
Joined: June 03, 2005
Posts: 14655
Location: Arizona
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| Posted: Sat Aug 27, 2011 11:10 pm Post subject: |
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For specs look in your service manual. If you're doing a brake job you need other info in the manual anyway.
Keep away from FLAPS. Go to a VW shop. Same with Midas and similar brake places, keep far away.
And actually with anything on your bus only go to VW shops and VW parts houses. But FLAPS and bling stores are still a good place to get oil and air fresheners. 
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69mightyfine
Samba Member
Joined: August 17, 2011
Posts: 34
Location: Portland, Oregon
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| Posted: Sat Aug 27, 2011 11:23 pm Post subject: |
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| Desertbusman wrote: |
| For specs look in your service manual. |
d'oh! good call. There it was at the back of Section 8 in the Service Manual.
Thanks again! |
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69mightyfine
Samba Member
Joined: August 17, 2011
Posts: 34
Location: Portland, Oregon
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| Posted: Sat Aug 27, 2011 11:24 pm Post subject: |
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| fusername wrote: |
| Most drums have a Max diameter in the casting somewhere inside the drum, have you looked for this? |
yes... I looked all over for it, but not noticeable. |
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jure-slo
Samba Member
Joined: November 06, 2009
Posts: 245
Location: Slovenia (Europe)
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sun Aug 28, 2011 2:47 am Post subject: |
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oops
they are available from several vendors, but
£187.96 net
Part ID 211-501-615/G/BQ
Stock level Special order item
Don't know if that is our part number. There are less expensive drums from other vendors and for other drum part numbers
Aloha
tp |
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jure-slo
Samba Member
Joined: November 06, 2009
Posts: 245
Location: Slovenia (Europe)
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| Posted: Sun Aug 28, 2011 4:17 am Post subject: |
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I bought a pair from Vw heritage about two years ago. For my '78.
They are lighter than originals and I remember that the side wall was thinner.
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sun Aug 28, 2011 11:01 pm Post subject: |
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| jure-slo wrote: |
I bought a pair from Vw heritage about two years ago. For my '78.
They are lighter than originals and I remember that the side wall was thinner. |
just ran across this
http://www.thesamba.com/vw/forum/viewtopic.php?t=359971
tp |
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jure-slo
Samba Member
Joined: November 06, 2009
Posts: 245
Location: Slovenia (Europe)
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| Posted: Sun Aug 28, 2011 11:21 pm Post subject: |
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At least on a late bay it's different design, so the wheel wont fall off...
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'76 Triumph spitfire 1500
'86 Polski Fiat
'72 Mercedes W115, 200D |
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Desertbusman
Samba Member
Joined: June 03, 2005
Posts: 14655
Location: Arizona
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| Posted: Mon Aug 29, 2011 12:27 am Post subject: |
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Turning drums is way overated. Like mentioned, if they pulse they are out of round. But with minor grooves it's no problem. The shoes will match the minor grooves accordingly. Turning drums when it's not needed is not the good thing to do.
A periodic inspection of your brakes will tell you when you need new shoes. If you wait until it's metal to metal then you might need to turn or replace the drums. An inspection once in a while is a lot easier and cheaper.
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XXX/Rx/RnR
Samba Member
Joined: March 01, 2008
Posts: 405
Location: valley of the sun
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| Posted: Mon Aug 29, 2011 1:45 am Post subject: |
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I'll be doing my rear break shoes this week when I get the parts. Saw no uneven wear on the old shoes, so i won't turn the drums. This is only the second set of shoes on these drums tho and hav'en had any issues. The Jerome campout is in a couple weeks. Going?
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Mon Aug 29, 2011 8:45 am Post subject: |
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for a very very long time the max safe diameter is stamped / cast into the outside of the drum. It has been that way for about 50 years or more.
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69mightyfine
Samba Member
Joined: August 17, 2011
Posts: 34
Location: Portland, Oregon
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| Posted: Mon Aug 29, 2011 10:08 am Post subject: |
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| SGKent wrote: |
| for a very very long time the max safe diameter is stamped / cast into the outside of the drum. It has been that way for about 50 years or more. |
I thought so too. Maybe with some healthy wire brushing I can uncover it.
Update on my project: I took the drums to a recommended shop first thing this morning to let them have a look. The guy agreed that we probably shouldn't turn them, that they were in good enough condition to just clean & scuff with some sandpaper. Hopefully we can finish up this project this evening before dark. |
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