What dual master cylinder needed.....?

[Hansome]

Hi Folks,

I want to upgrade my single master cylinder to dual master - 66' C10 step side - drums all round .
Having looked around I'm finding myself confused about which to get and from whom!,
I'm not interested in having power brakes, and I will be sticking with drums for now.
Trouble is I can't just pop down the auto parts store as we don't have them here (for our trucks) in the UK and the good lady indoors won't allow me to come to USA just to go parts shopping ........... Yet!
As I said I've been looking online at summit - classic - brothers but I seems the more I look the more options I find and then the more confused I get about which is the right one for my application?
Any and all help will be greatly appreciated over here, thanking you

T' da

D
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[Figuarus]

if you can get a hold of a Master cylinder from a 67, you will have what you need. Just remember to split the brake lines front to rear.

[Captainfab]

All you need is a master cylinder for a '67-'70 C10.

[Hansome]

Excellent- thank you guys.
That clears up the confusion, have found this at rock auto will this particular MC do the job

https://www.rockauto.co.uk/catalog/m...nid=486&jpid=5

Ta

D
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[luvbowties]

Looks right.
s

[vince1]

I ordered the MC for a 67 from Rockauto. Even with freight it came at a saving from what I could get here.

On our trucks, front line out of the cylinder to front brakes, rear line to rear brakes? What happens if they are reversed?

[canadian_diesel1964]

I think on my S10 MC its front brakes to rear and rear brakes to front of the MC...someone correct me if I'm wrong..but in your case might not matter...as its drum/drum and no proportioning is needed...

[Captainfab]

On the '67-'70 master cylinders, the front port is front brakes and rear port is for rear brakes. Not all master cylinders are designed the same.

[Keith Seymore]

Originally Posted by canadian_diesel1964

I think on my S10 MC its front brakes to rear and rear brakes to front of the MC...someone correct me if I'm wrong...

On your S truck MC the port with the larger reservoir is required for the discs, so that port goes to the front.

K

[canadian_diesel1964]

Thank you but are you sure on that as I've read here so much that the larger line is for drums needing more fluid...

[canadian_diesel1964]

Here's a typical set up....

[canadian_diesel1964]

Confusing for sure...but this has rear on front

[vince1]

In the 67 reservoir the chambers are the same size and IIRC they did not use a proportioning valve.

Captain confirms that front line to front brakes and rear line to rear brakes, so I've got some swapping to do. Seems to work perfect as I have it though.

[Keith Seymore]

Originally Posted by canadian_diesel1964

Thank you but are you sure on that as I've read here so much that the larger line is for DISC needing more fluid...

Fixed that. Think about the size of a piston inside a brake caliper vs the size of a wheel cylinder inside a drum brake.

Pretty sure; I was a brake development engineer for GM Truck.

K

[canadian_diesel1964]

Originally Posted by Keith Seymore

Fixed that. Think about the size of a piston inside a brake caliper vs the size of a wheel cylinder inside a drum brake.

Pretty sure; I was a brake development engineer for GM Truck.

K

Thank you I'm glad to finally know!
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[canadian_diesel1964]

I am finding a lot of folks have their brakes wrong if you look at this one the front discs are hooked to the rear smaller reservoir and have smaller lines. reading the posts after this one the front are the ones that split after the prop valve...

[canadian_diesel1964]

I'll tell you a funny story...I emptied the MC and found the rear chamber to be larger than the front...it's an optical illusion for me as it seems taller up front...it explains a ton!

[C10_ustacould]

Does anyone sell a kit with pre bent and flared brake lines for this upgrade?