<VV> installing a dual MC in '65

[Frank DuVal]

Seth,

Here in the rusty east it is very foolish and dangerous to reuse steel 
brake lines. The brass fitings are OK, but please, do not reuse the 
steel. And now that our cars are 40 years+, also do not reuse the rubber 
lines. They can fail internally and cause brake lockup.

John,

As Lon said, dual MC drum brakes systems like Corvairs did not use a 
proportioning valve. It is a pressure switch to light the light when one 
circuit fails.

I have installed several Dual MC kits from our vendors in 62 to 66 cars 
with no problems. There is no switch block or pressure valves in the 
kits. I have not checked into the Multi Kit, even though I usually 
replace everything (springs, hardware, wheel cylinders, etc) when doing 
a brake overhaul. Safety first said the guy who has had brake failure on 
the road. BTDT, let's not repeat.

Frank DuVal

Sethracer at aol.com wrote:

> 
> 
>In a message dated 5/28/2009 11:06:21 AM Pacific Daylight Time,  
>keith.hammett at stainlessfab.com writes:
>
>Since  the convert is totally apart and at the painter, I started my list
>of what  I would need to get her back together.  On the list is brakes, I
>would  like to go to a dual MC.  Since I will be putting in new brake
>lines  what is the difference between a single mc LM and a dual mc LM?
>How are  lines routed for the dual MC.  Am I better off to buy the dual
>MC  conversion from Clark's or buy the Multikit for a '67 to '69 that
>includes  the dual MC?
>
>
>
>
>
>The 65 Corvair is different than the 66 Corvair. The line to the rear  
>brakes is smaller in 65. I am sure the clarks kit allows for this difference. I  
>have converted a few ones with 67-69 parts. The 65 requires a slightly 
>different  fitting (feeding the rears) at the firewall because of the line size 
>difference,  unless you swap in a 66-69 line set. The fitting at the back of 
>the 65 is also  smaller to mate with the smaller line to the front. If you 
>can find a good  used master cylinder to rebuild, and feel comfortable about 
>doing it, you will  have one advantage. The stock masters have little 
>pressure valves in the outlet  ports to maintain a small pressure in the line. 
>Most of the new, replacements do  not. Sometimes they get removed during a 
>rebuild as well. This is not a deal  breaker, but I thought you might want to 
>know. If the car is a stockish,  street-driven car, you won't need any 
>balance valve. The Corvair brakes are  balanced front to rear by their widths, and 
>the weight distribution of the  Corvair doesn't really get too upset under 
>braking, unlike almost all front  engined cars. If you find someone parting 
>a 67-69, try to get all the fittings  and lines as a complete set. If you 
>want a new master, try to get one that is an  exact match for the stocker. 
>(line fittings on the correct  side, etc.) 
> 
>Seth  Emerson
>
>  
>