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m2008s Samba Member
Joined: July 28, 2007 Posts: 139 Location: Canton, ohio 44707
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Posted: Mon Dec 15, 2008 10:37 am Post subject: brake rotor machining, 1971 model year split |
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so my fronts are shot... but my rotors can be turned (no big pits or divits etc). i just want to know the minimum machining level/replacement thickness so i can see if i could get them turned or not
anyone have any idea? also i realize 71 had a split and im trying to figure out which month mine was built... and i have no tag to say so. SN 3612263490
thanks a ton i really appreciate it...
mike _________________ I have VD (volkswagen disease).
Check out my Myspace (click WWW) and add me, send me a msg though or ill decline .
FOR SALE 71 SQUARE http://www.thesamba.com/vw/classifieds/detail.php?id=690111 |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34018 Location: Conejo Valley, CA
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Posted: Mon Dec 15, 2008 11:19 am Post subject: |
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When the rotors changed the calipers did, too. Do you have two bleeder valves on each side? What is the bolt spacing on the caliper? We can determine "early '71" or "late '71" with those two pieces of info.
I am not sure if the min rotor thickness changed at that time. The calipers and pads got larger, and the rotors changed. But the thickness may or may not have, so it may not change your answer about machining them or not. You can call the machine shop and ask them if it changed.
Also, check the rotor's outer edge; I thought the min dimension was cast into it. |
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Russ Wolfe Samba Member
Joined: October 08, 2004 Posts: 25187 Location: Central Iowa
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Posted: Mon Dec 15, 2008 1:11 pm Post subject: |
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Rotor change happened in 72, not 71.
71 takes the same rotor as 1966 thru 1971. _________________ Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey
Gary: OK. Ima poop. |
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Bobnotch Samba Member
Joined: July 06, 2003 Posts: 22425 Location: Kimball, Mi
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Posted: Mon Dec 15, 2008 3:01 pm Post subject: |
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According to Bentley, the thickness didn't change with the rotor size change. New thickness should be 9.45 - 9.50mm (.372-.374 inches), and the wear limit (for replacement) is 8mm (.315 inches). Now the minimum thickness after turning can only be 8.50mm (.335 inches) thick. I hope this helps. _________________ Bob 65 Notch S with Sunroof
71 Notch ...aka Krunchy; build pics here;
http://www.thesamba.com/vw/forum/viewtopic.php?t=249390 -been busy working
64 T-34 Ghia...aka Wolfie, under construction... http://www.thesamba.com/vw/forum/viewtopic.php?t=412120
Tram wrote: |
"Friends are God's way of apologizing for relatives." |
Tram wrote: |
People keep confusing "restored" and "restroyed". |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34018 Location: Conejo Valley, CA
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Posted: Mon Dec 15, 2008 4:01 pm Post subject: |
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Russ Wolfe wrote: |
Rotor change happened in 72, not 71.
71 takes the same rotor as 1966 thru 1971. |
That's what I thought, and posted many months ago, but I got corrected that late in the '71 model year they introduced the change. At any rate, the simultaneous caliper change is easy to spot. They were sometimes changed if the car was hit in front (like mine) and the beam replaced. I have a '73 beam so I have the later brakes on my '71. |
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Russ Wolfe Samba Member
Joined: October 08, 2004 Posts: 25187 Location: Central Iowa
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m2008s Samba Member
Joined: July 28, 2007 Posts: 139 Location: Canton, ohio 44707
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Posted: Mon Dec 15, 2008 6:19 pm Post subject: |
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thanks, i really appreciate the help. foreign parts store told me different, but i believe you all over them
mike _________________ I have VD (volkswagen disease).
Check out my Myspace (click WWW) and add me, send me a msg though or ill decline .
FOR SALE 71 SQUARE http://www.thesamba.com/vw/classifieds/detail.php?id=690111 |
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atrujillo1991 Samba Member
Joined: May 16, 2007 Posts: 155
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Posted: Mon Dec 22, 2008 1:36 pm Post subject: |
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My car was built 08/71. My left front caliper is the later style with two bleeders and the right is the earlier caliper with only one bleeder valve _________________ '72 OG Square
'87 Montana Green GTI- EX 3.0L
'92 GTI- 16vABAt 450+WHP
'96 Celebration Jetta- 16vABA |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 34018 Location: Conejo Valley, CA
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Posted: Mon Dec 22, 2008 4:43 pm Post subject: |
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So you have different spindles and discs on the sides?!
There are some subtleties in the T3 calipers. For example, the same looking part, minus the compensating pin device, is used in the T4, but they are NOT interchangeable. Also, relevant to you, there are reports of a smaller calipers that still have two bleeders. These may have been replacement units made with two so they can be used right or left side. This might explain yours without the extreme of different year axles on the same beam!
Last edited by KTPhil on Mon Dec 22, 2008 7:58 pm; edited 1 time in total |
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Gary Person of Interest
Joined: November 01, 2002 Posts: 17069 Location: 127.0.0.1
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Posted: Mon Dec 22, 2008 6:19 pm Post subject: Re: brake rotor machining, 1971 model year split |
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m2008s wrote: |
so my fronts are shot... but my rotors can be turned (no big pits or divits etc). i just want to know the minimum machining level/replacement thickness so i can see if i could get them turned or not
anyone have any idea? also i realize 71 had a split and im trying to figure out which month mine was built... and i have no tag to say so. SN 3612263490
thanks a ton i really appreciate it...
mike |
If they are shot, what good with turning do? I never turn rotors, no matter what. You want them as thick as possible. _________________ West Virginia State Board of Education v. Barnette, 319 U.S. 624 (1943) |
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VWGirl Samba Member
Joined: June 03, 2003 Posts: 2462 Location: Powder Springs, GA
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Posted: Mon Dec 22, 2008 9:44 pm Post subject: Re: brake rotor machining, 1971 model year split |
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Icy wrote: |
m2008s wrote: |
so my fronts are shot... but my rotors can be turned (no big pits or divits etc). i just want to know the minimum machining level/replacement thickness so i can see if i could get them turned or not
anyone have any idea? also i realize 71 had a split and im trying to figure out which month mine was built... and i have no tag to say so. SN 3612263490
thanks a ton i really appreciate it...
mike |
If they are shot, what good with turning do? I never turn rotors, no matter what. You want them as thick as possible. |
I hate to agree with Icy, but I don't see why you are turning your rotors either... if they are "shot" then get new ones... _________________ Without love in the dream it will never come true |
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