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PJ_1600
Samba Member
Joined: June 30, 2008
Posts: 149
Location: Edmonton, Alberta, Canada
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 Posted: Thu Jun 13, 2013 12:20 pm Post subject: 69 bug master cylinder missing center switch - help! |
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Hi - i am replacing the original master cylinder in my 69 Beetle and, as you can see from the photo the original mc has 3 brake switches where as the new one only has two. According to CIP1 this is the correct mc for this year so my question is, what do i do about having no where to hook the center wires to? I think the center wires are just for the red B light on the dashboard (a brake warning light?) and the outer two are for the rear brake tail lights. If I am correct is there any harm in leaving the center wires unconnected? Should I be looking for a different mc? Any help would be most appreciated!
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32983
Location: Reading Pennsylvania
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Q-Dog
Samba Member
Joined: April 05, 2010
Posts: 8839
Location: Sunset, Louisiana
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| Posted: Thu Jun 13, 2013 12:36 pm Post subject: |
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I haven't seen a 3 switch master in many years. I used to rebuild them, a long time ago. Now it seems we just replace them. I suppose you could try to rebuild the original.
If it is important to you, you can rewire the brake circuit to retain the brake warning light. It involves changing the switches from the 2 terminal type to the 3 terminal type.
If you are gonna throw out the old master, I would take it off your hands. MAYBE, it can be rebuilt.
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Brian
'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle |
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VDubNut
Samba Member
Joined: July 18, 2006
Posts: 106
Location: Lexington, OR
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| Posted: Thu Jun 13, 2013 12:41 pm Post subject: |
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You will need to replace the swithches. I cut this from Airhead Parts:
If replacing orig. master cyl. on 67-69, customer will need to buy 2 each three-prong brake switches 113-945-515 G to use brake warning light. (Orig. had 3 two-prong switches - replacement has 2 three-prong switches.)
Here is the add: http://www.airheadparts.com/vintage-vw-parts/brake...11015-bdgr
Looks like the same master as the one you purchased, just the switches have changed. Hope this helped!
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Mike
Current VeeDub:
'69 Patina (0\_!_/0)
Previous VeeDubs:
'91 Jetta GL
'72 (0\_!_/0) |
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vernonc
Samba Member
Joined: April 23, 2012
Posts: 681
Location: Parkersburg, WV..yes, I sold the boat
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| Posted: Thu Jun 13, 2013 2:38 pm Post subject: |
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Here's a link for wiring the 3 prong switches.
http://nls.net/mp/volks/schem/3brake.gif
Hope this helps..........it did me. 
mort
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"Those who don't read newspapers are un-informed. Those who do read newspapers are mis-informed." Will Rogers
'69 sedan, low mileage, all original.....currently being 'freshened-up' for road trips and daily driving...just not every day
Freshening-up link http://www.thesamba.com/vw/forum/viewtopic.php?t=617386 |
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PJ_1600
Samba Member
Joined: June 30, 2008
Posts: 149
Location: Edmonton, Alberta, Canada
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| Posted: Thu Jun 13, 2013 4:42 pm Post subject: |
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Thanks for the replies. So I need to buy two 3 prong switches. Hmm, would have been nice if CIP1 had told me that when I asked - oh well, now I know (and apparently they didn't).
Mort - thanks for the diagram. That will be a huge help. Now I just have to wait a week to get the right switches and I've got three brand new 2 prong switches I don't need. Such is life.
Thanks guys - once again The Samba answers that which no local parts counter can. (At least in my area). |
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gt1953
Samba Member
Joined: May 08, 2002
Posts: 13947
Location: White Mountains Arizona
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| Posted: Thu Jun 13, 2013 5:35 pm Post subject: |
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Which ever master cylinder you purchase make sure it is a good one.
My 68 only has a 2 switch...
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Volkswagen: We tune what we drive.
Numbers Matching VW's are getting harder to find. Source out the most Stock vehicle and keep that way. You will be glad you did.
72 type 1
72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold}) |
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djkeev
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Joined: September 30, 2007
Posts: 32983
Location: Reading Pennsylvania
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PJ_1600
Samba Member
Joined: June 30, 2008
Posts: 149
Location: Edmonton, Alberta, Canada
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| Posted: Thu Jun 13, 2013 5:51 pm Post subject: |
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So Dave are you saying that I can use the two prong switches and just leave the center two wires (that used to go to the middle switch) disconnected? And this won't affect the operation of the brake lights? If ALL the center switch does is activate the idiot light, as you say, then I really don't care if it is operational. I'm not too swift when it comes to electrical systems so this question may sound silly.  |
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djkeev
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Joined: September 30, 2007
Posts: 32983
Location: Reading Pennsylvania
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PJ_1600
Samba Member
Joined: June 30, 2008
Posts: 149
Location: Edmonton, Alberta, Canada
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| Posted: Thu Jun 13, 2013 6:07 pm Post subject: |
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| Thanks Dave - now I can go ahead working on this tonight instead of having to wait for new switches. The switches are so much easier to put in the mc before it is installed so I was going to wait - now no need. Thanks again! |
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Q-Dog
Samba Member
Joined: April 05, 2010
Posts: 8839
Location: Sunset, Louisiana
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| Posted: Thu Jun 13, 2013 6:31 pm Post subject: |
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I guess I should have been clearer.
| Q-Dog wrote: |
| ... If it is important to you, you can rewire the brake circuit to retain the brake warning light. It involves changing the switches from the 2 terminal type to the 3 terminal type. ... |
And, yes, if you don't care about the brake warning circuit, reuse the switches you have.
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Brian
'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle |
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