DaleO

I want to replace single pot master cylinder to dual for safety reasons on my 65. Don't believe I require a proportioning valve, so can I run the front to rear brake line directly from dual master cylinder to rear, and what size is recommended?.. Regards, DaleO

Nowhere Man

buy everything for a 67

DUB

I agree and you may also need to replace the brass junction block for the left rear wheel area at the end of the line that runs down the inside of the frame due to the size of that line may be larger than what you have currently.

Also the new junction block that the lines from the master cylinder that go to it. There is brake warning switch that you can wire into the wire that goes to your handbrake switch so it can tell you if you have hydraulic brake system problems that GM began to use in the 1967 and later cars. It is an added useful feature worth doing.

DUB

FINWOLF

I did it 20 years a go don't remember what year I took it from but here are some pic's

LB66383

I did this conversion several years ago on my '66. I got a conversion kit that included a '67 style dual master, some new lines, and junction blocks. I don't remember where I got the kit, but it was from one of the major Vette parts suppliers. It included the "proportioning valve," which I did not use. I went to a local shop and they made me adapters to connect the master directly to the brake lines. Been working great for years.

One item -- the kit included a new brake line from the master to the rear junction block. It wasn't too bad replacing this line on the '66, but I have heard it's a bear on a '65 without lifting the body.

SWCDuke

The front and rear caliper pistons are sized to achieve a 65/35 percent front/rear brake torque split. The only C2 brake system that had a prop. valve was J-56, and it was adjustable in order to vary brake torque distribution according to tire and track grip conditions.

Dual circuit masters used a differential pressure switch in place of the junction block used on single circuit masters. It would light the "brake" warning light if one of the circuits wouldn't hold pressure. You don't absolutely need that feature in which case you can run separate front and rear pipes or plumb in the '67 differential pressure switch is you want that feature.

Duke

58n65

I did the conversion and just bought the 67 setup from Ecklers, I think.

Thanks,
Dex.

DaleO

Thanks for the insight Duke... Regards, DaleO

joetunick

I just did this on my '65. I converted to a power system as well, which was definitely worth it. I bought a kit from Ecklers. It's okay, NONE of the lines they gave me even came close to fitting: they were either just wrong or they had fitting mismatches. They also provided a front-to-back line, which apparently requires that the body be removed to install it. I just used the old one (which was new, just smaller).
Make sure you specify if you have 4 wheel discs or rear drums as there is a difference in the master cylinder.