MC leaking, which rubber bung do I need (and hose?)

[BMFBMF]

Hi Folks, the special parts on the SA beetle confusing me again.

MC started leaking from feed bung of single circuit MC ( Stock supply for 71 in SA) and no parts book show this year...

Rubber bung seems to have been original😱.

No replacements rubbers look like that look like that , does this equivalent look correct with the large top portion.?

https://www.cagero.com/de/prod/Aircooled/K%C3%A4fe...&n=125

or

https://www2.cip1.com/vwc-211-611-817-apr/

Gave the area a good wash after. Will also get new rubber hose for top and bottom of the feed pipe. Is there specific brake fluid resistant hose or is fuel hose fine?

Thanks a million
_________________
-----Slava Ukraini-----
1971 Stock South African Beetle 1300 : My mom's european "Thin Chick" spec. Completely stock with torsion bar front, swingaxle rear, smooth hubs, single MC, 40 mm shoes, 31PICT3 carb and 5 bolt drums all round, currently Running a 1976 SF:AS engine with the original SF:AD engine overhauled in a box, waiting to go back in one day.

[Cusser]

Special rubber formulation for brake hoses.

I've seen rubber bungs and elbows if different sizes, best to replace as a pair, needs to match the diameter of the recess in the master cylinder.

Once upon a time (1990s) I installed a rebuilt MC from Autozone, and one of the plastic elbows was cracked. All the other replacements had a different size elbow, so I ended up swapping out the entire MC. Good news is that one lasted over 20 years, then I swapped it for a "new" rebuilt one.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

[61SNRF]

Yeah, looks like no Beetle that was ever sold in the states. Either one of those grommets you linked does look correct though.

The supply hose itself is specific to brake fluid but for some reason can't find the 7mm hose in the CIP1 catalog.

It would seem more effective to get everything from one place. Have you ever delt with VW Heritage in the UK? They have the same grommet...
https://www.heritagepartscentre.com/us/211611817a-...inder.html
...and they have the hose too...
https://www.heritagepartscentre.com/us/n0203501-brake-hose-low-pressure.html
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-Bruce

An ounce of prevention is worth a pound of cure.

[VW_Jimbo]

That is a pre 66 brake master cylinder in the states. Your car here would have a dual circuit unit, instead of the single circuit that you have. Wolfsburg West has your part.
https://www.wolfsburgwest.com/cart/DetailsList.cfm?ID=113611817

I have never seen that done before! WOW! Thought I had seen all of it!
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Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[ashman40]

Heritage Parts is a good source for Euro-spec Beetle parts.

That link you provided is for the 66-later MC. Your single piston MC looks more like the 65-earlier one. You should probably limit your parts search to that earlier model. Take a look at this link:
https://www.heritagepartscentre.com/us/113611817-brake-master-cylinder-plug-4-16mm.html
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AshMan40
---------------------------
'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!}

[jinx758]

As you probably already know ...

Please neutralize & clean that spilt brake fluid asap. It will strip paint leaving bare metal which will cause rust and no one wants that.

Best of luck ... stay safe

jinx
_________________
" It's not valuable unless you learn something from an experience. " Henry Ford

It's not unlike the same difference

You can't push a rope


VALVES (cold)
POINTS
TIMING
CARB (fully warmed engine)

SCRAPE ALL GROUNDS

My Craigslist rescued 100 footer :
1971 Standard Bug
1776cc dual port
034 distributor
38mm EGAS Carburetor

[BMFBMF]

Hi Folks, thanks for the input.

Bit thorny these "foreign beetles", the US ones are a world apart from the Euro ones, and the SA ones are very similar but with their own quirks. You folks gave me some good pointers to delve deeper and take some measurements. (which I should have done upfront 🙄)

This is from the "Car magazine" review when car was released. It was/is the major automotive magazine in SA

😁😂😂🤣🤣

Just to confirm, this MC is the later 17mm one as was used in the later 60's euro beetles. This single circuit one was as originally supplied in the "economical;" 1300 version in SA. The earlier 19mm MC will modify the braking balance and I dont want to do that. I will probably pick this one up as a spare.

https://www.cagero.com/de/prod/Aircooled/K%C3%A4fe...&n=125

or if I'm feeling flush, this one

https://www.cagero.com/de/prod/Aircooled/K%C3%A4fe...&n=125

I guess I could change it to dual circuit for the potential safety improvement but this single circuit style MC has served me well for 200'000 kilometres with the only problem I had being that the brake light switch failed on the day of my driving test. Will never forget that one!!!!! (this is the second MC, I replaced it for an identical one bought from a friend who ran the local VW dealer in the early 90s). I tried to rebuild the old one but failed and took the new one part to check it so I'm sure they were identical.

Ashman, thanks for looking for that plug. I think though, as you state, its for the earlier MC, I just went out to measure mine and its roughly 7mm id and 18 mm OD, the earlier one has 4mm ID and 16mm OD which will not fit this MC/elbow

Thanks for the Heritage tip folks. However Ive had some rather low quality experiences with them, the flywheel oring had a bite out of it and did not feel as flexible as it should have been, the dizzy seal had a casting hole on the sealing surface. The mirror I got had used glue to seal it and the glue had eaten though the mirror coating on the 4 corners. They sent me a new one but it had EXACTLY the same problem, so I gave up.

These Cagero guys in Switzerland have proven to provide superb quality stuff, luckily I see they also have the proper brake hose. Thanks for setting me on the right trail folks.

Learned A LOT about the MC today, after 30 years, Ill probably have forgotten it all again the next time, so its going into the log book!!! 😉.

Some more pics form the Drive report

Jinx, I sprayed some soap on it and brushed it down and then hosed it all away with water. What do you mena by neutralize?

Cheers
_________________
-----Slava Ukraini-----
1971 Stock South African Beetle 1300 : My mom's european "Thin Chick" spec. Completely stock with torsion bar front, swingaxle rear, smooth hubs, single MC, 40 mm shoes, 31PICT3 carb and 5 bolt drums all round, currently Running a 1976 SF:AS engine with the original SF:AD engine overhauled in a box, waiting to go back in one day.

[jinx758]

You should be good.

I always blow off with air but I'm a little paranoid & sometimes my OCD keeps me awake at nite. Lol

Best luck ... stay safe

jinx
_________________
" It's not valuable unless you learn something from an experience. " Henry Ford

It's not unlike the same difference

You can't push a rope


VALVES (cold)
POINTS
TIMING
CARB (fully warmed engine)

SCRAPE ALL GROUNDS

My Craigslist rescued 100 footer :
1971 Standard Bug
1776cc dual port
034 distributor
38mm EGAS Carburetor

[BMFBMF]

Got the stuff from Cagero, the rubber bung part number 211 611 817 A is the correct size for the record for the European/home market beetles 7 mm ID and 18mm OD. Quality looks great, it does not have the casting mold line down the side like some I've seen online.

For the record the 1200 and 1300s that carried on with the drum brakes and the single MC have 17.46 mm MC, 22.2 mm front brake cylinder and 17.46 mm rear brake cylinders.

The ones that came with dual MC had 19.05mm bore, wheel cylinders were the same.
_________________
-----Slava Ukraini-----
1971 Stock South African Beetle 1300 : My mom's european "Thin Chick" spec. Completely stock with torsion bar front, swingaxle rear, smooth hubs, single MC, 40 mm shoes, 31PICT3 carb and 5 bolt drums all round, currently Running a 1976 SF:AS engine with the original SF:AD engine overhauled in a box, waiting to go back in one day.