Dual Circuit Master Cylinder conversion

[Homeresque]

[Eric&Barb]

BTW have you double checked that the stop bolt in the top of the MC is tight? If loose it will leak from up under the reservoir and look like grommet failure with MC in situ.
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In Stereo, Where Available!

[ozark23]

[GERMANAIRE]

[GERMANAIRE]

[perello]

mod needed at the floor pan to fit an ATE MC

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Aug '58 pressed bumper SO23
1974 German Thing
1978 Bug 1200

[Eric&Barb]

[perello]

[GLHTurbo]

[TurbedAWD]

After reading through this entire thread and seeing it has spanned many years, parts prices and availability have changed. Would the easiest solution, for someone who will continue to use drum brakes all around, be just to use a 67 master cylinder with reservoir? They are both available from CIP for about 100 bucks.

[Eric&Barb]

Except for say a 1967 only bus. Both the 1967 only and the 1971-79 MCs take the same requirements to install. So no easier either way for pre-1967 bus.

With a 1967 bus the push rod is already setup for the 1967 MC, and would probably need to be redone for the later MC.

Seeing that one can get the later MC for just over $50.00 right now. That means for the average Joe, not having to work an extra 4 or more hours at work to pay for the 1967 only MC. So easier that way.

Also if out on the road, lot more chance of finding a later MC in a local FLAPS than the 1967 only MC.
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In Stereo, Where Available!

[TurbedAWD]

[Eric&Barb]

[Bruce Amacker]

I just finished installing a '67 MC on my '65 bus today, here's some notes:

Stroke of the '67MC is 32mm per the Bentley, I measured the stroke of the pushrod (without MC installed) on my '65 bus and got exactly 32mm. No pushrod modification was needed.

Does anyone have pictures of the '67 pushrod assy next to a >66 pushrod? I can't see the difference.

I used the Chinese MC from Cip1 and a Rabbit reservoir, it fit well without a spacer, of course.

I haven't bled or driven the bus yet but I'm confident it will be fine. My '66 bus has a late Bay power MC (manual brake MCs don't fit) with a spacer. The power MC has a bore of 22mm which is probably giving me a hard pedal as the '67MC is 3/4"/19.05mm. I'll likely change the '66 bus to a '67MC in the future.

The pedal pan (if I install it) will need some cutting. I'll post up pics soon so you can see the line routing. (pretty much the same as everyone else's)
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'66 Deluxe Bus
'65 Standard Bus
Build threads:
'66- http://www.leakoil.net/forum/viewtopic.php?f=23&t=2888&sid=54d8dedfb3822f99c7f2ea430cb4e856
'65- http://leakoil.net/forum/viewtopic.php?f=23&t=4263

[Eric&Barb]

[Alan Brase]

Been following this with interest because I am about to roll the 56 pickup over onto the rotisserie and clean and paint the bottom and ALL NEW BRAKE PARTS! I bought a roll of the copper bearing metal line stuff. Gonna go all stock BUT a dual circuit master.
HERE'S SOMETHING I'M CONSIDERING;
68-69 MC is a Q, I think, 70 is a T(Drum brakes, no booster) Both about 22.2mm (7/8"- .875") bore and physically the same as 1967's .EXCEPT the 1969 cylinder (Q) has 2 output fittings for the front.
Also, all 3 years have residual valves, that partly check the return flow, so you can pump the pedal up. (NO DISC brake M/C's will have these).
I have a ton of cores around. I used 69 and 70 type 2's as daily drivers for about 3 decades , so, I'll try to figure out which I like the best, then perhaps buy a new or rebuilt one. Or a kit and rebuild my own.
Bottom line, It seems to me that using disc brake Vac- boosted master is just plain wrong in several ways.
(edited- the 1968-9 is the one with 2 front line fittings. and the size on all 3 years is 22.2mm.)
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Al Brase
Projects: 67 sunroof bug, 67 Porsche 912 Targa, 70 Westy
Dec 1955 Single Cab pickup WANT 15" BUS RIMS dated 8/55, thru 12/55
To New owners: 1969 doublecab, 1971 Dormobile
Vanagons:
80 P27 Westy JUL 1979, 3rd oldest known US
83 1.6TD Vanagon, 87 Wolfie Westy daily driver, swap meet home

[Eric&Barb]

Residual valves can be added. Personally have just keep the shoes adjusted properly Big problem with the 1968-70 MC is how to mount and use those years of reservoirs.

Please update how it goes!
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In Stereo, Where Available!

[Alan Brase]

Are they not the same as the 1967 one? If not... I agree, not so great. Pretty sure they are both 20mm, though.
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Al Brase
Projects: 67 sunroof bug, 67 Porsche 912 Targa, 70 Westy
Dec 1955 Single Cab pickup WANT 15" BUS RIMS dated 8/55, thru 12/55
To New owners: 1969 doublecab, 1971 Dormobile
Vanagons:
80 P27 Westy JUL 1979, 3rd oldest known US
83 1.6TD Vanagon, 87 Wolfie Westy daily driver, swap meet home

[Alan Brase]

[Airkewld]

Tried and true, works every time - http://www.airkewld.com/Dual-Circuit-DISC-Master-Cylinder-Kit-4852-p/4852.htm
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