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Sat Feb 25, 2023 7:32 pm

Busstom wrote: If I were to do it that way, I would only be using the original reservoir above as a fill-funnel to run the fluid down to the new dual-chamber reservoir, and visually ensuring that the new reservoir below is NOT overfilled. The new grommet that the hack hacked in there MAY hold fluid under gravity pressure (aka "head" or "static" pressure), but what the hack didn't tell you in the video is that if you fill up your O.E. reservoir up above, fluid WILL leak out of the vented cap below until the level above is exhausted, and be lying spilled all over your pan.

Oh yeah, I would just use the stock location as a funnel to fill the other for brake bleeding and whatnot. I was more wondering if there were other concerns you guys could think of.

Sat Feb 25, 2023 7:36 pm

None that I can think of, other than to be sure and thoroughly deburr the inside of the new hole so that a chard of plastic doesn't drop off and get lodged somewhere downstream.

Sat Feb 25, 2023 8:00 pm

Busstom wrote: None that I can think of, other than to be sure and thoroughly deburr the inside of the new hole so that a chard of plastic doesn't drop off and get lodged somewhere downstream.

That's about all I could think of, thanks!

Sun Jun 04, 2023 9:44 am

What a great thread and good discussion .

Grampa Pete, if you're still here I'd like to hear about the silver backed tape I see on your Bug .

TIA,

Sun Jun 04, 2023 9:54 am

VWNate wrote: What a great thread and good discussion .

Grampa Pete, if you're still here I'd like to hear about the silver backed tape I see on your Bug .

TIA,
He hasn't logged on in almost three years.

Sun Jun 04, 2023 10:08 am

Oh well .

Fri Jul 14, 2023 6:24 am

Thank you so much for posting this @grandpa_pete!

Tue Oct 24, 2023 7:14 pm

mkbug wrote: I was sent these three prong brake switches for my upgrade. Can I make these work? My old system had two prongs.

Probably going to answer my question but..I have 2-prong switches installed on the dual MC and wondering if it would be better - wiser to remove and install 3-prong switches and wire up as shown?

Also, if keeping with the 2-prong switches I would only utilize 1 switch wired as the 2nd switch acts as a "spare"..correct?

Edit..'56, Running discs upfront / drums in rear

Wed Oct 25, 2023 6:47 am

3 prong switches allow you to have an alarm for when one side of the dual circuit master cylinder fails.

Wed Oct 25, 2023 7:12 am

EVfun wrote: 3 prong switches allow you to have an alarm for when one side of the dual circuit master cylinder fails.

Makes sense and already talked myself into replacing the 2 w/ 3.
Always seem to be reordering and redoing. :?

Thu Jun 06, 2024 8:16 pm

Has anyone who's done this conversion has issues with brake light switches? I've tested the wiring itself and replaced the new switches with other new switches. Bench bled the master cylinder. Thoughts? It's definitely a switch issue... 🤔

Thu Jun 06, 2024 10:08 pm

SparksLP wrote: Has anyone who's done this conversion has issues with brake light switches? I've tested the wiring itself and replaced the new switches with other new switches. Bench bled the master cylinder. Thoughts? It's definitely a switch issue... 🤔

You might want to consider circumventing the better-late-than-never brake switch(es) in the master cylinder and just get one of these:

https://www.aircooledevolution.com/product-page/pedal-activated-brake-light-switch

If you're still running a 6v system you'd want to wire it with a relay.

Thu Jun 06, 2024 10:08 pm

SparksLP wrote: Has anyone who's done this conversion has issues with brake light switches? I've tested the wiring itself and replaced the new switches with other new switches. Bench bled the master cylinder. Thoughts? It's definitely a switch issue... 🤔
I have not but the issue seems to come up here pretty often. With a helper to push the brake pedal you can test the switches to confirm their condition. I'm not sure what is the current best brand to use. Some members reported switching to this mechanical switch. My beach buggy has a mechanical brake light switch but made my own before I saw that option

Fri Jun 07, 2024 7:35 am

SparksLP wrote: Has anyone who's done this conversion has issues with brake light switches? I've tested the wiring itself and replaced the new switches with other new switches. Bench bled the master cylinder. Thoughts? It's definitely a switch issue... 🤔
It's definitely a switch issue - unless you still have some air in the system so the pressure doesn't build up enough to actuate either of the two brake switches.

Fri Jun 07, 2024 3:23 pm

Ok, thanks guys! I'll re-bleed the brakes again and see if that fixes it. If not, that mechanical switch seems like a simple upgrade!

Sun Jun 09, 2024 4:29 pm

The new switches work! Now I just have to adjust the brakes. I assume the process is the same, no matter if it's a single or dual master cylinder?

Sun Jun 09, 2024 4:39 pm

SparksLP wrote: The new switches work! Now I just have to adjust the brakes. I assume the process is the same, no matter if it's a single or dual master cylinder?

Different.

Sun Jun 09, 2024 5:10 pm

https://www.thesamba.com/vw/forum/viewtopic.php?t=715840&highlight=bentley+brake+bleeding

Sun Jun 09, 2024 8:35 pm

Eric&Barb wrote: SparksLP wrote: The new switches work! Now I just have to adjust the brakes. I assume the process is the same, no matter if it's a single or dual master cylinder?

Different.
Adjusting is the same for both single or dual circuit brakes. It's only the bleeding process that's different. :wink:

Sun Jun 09, 2024 8:50 pm

mukluk wrote:
Adjusting is the same for both single or dual circuit brakes. It's only the bleeding process that's different. :wink:

Different for bleeding, and the reason why VW went with the dual holes in each backing plate after 1967 so both adjusting stars can be fully locked tight against each drum.