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post #1 of 6 (permalink) Old 09-09-2019, 06:44 PM Thread Starter
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should i just leave well enough alone?

So I'm debating taking the vacuum booster off the car. Now that the drums actually work, the car stops nice and the booster lets me do that with very little foot pressure, however, there is a "feel" thats not there. I didn't mind the non powered brakes so now that they'll work I'm thinking of pulling the booster off.

That's easy enough to do, but should I replace my adjustable proportioning valve and distribution block with a combo unit like ones I see at NPD:


and while I'm at it I can put in a residual valve since I don't think this block has that. Below is what my setup looks like now.
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66 Convertible, GT clone. 289 4V, C4. Springtime yellow with black top

Last edited by ophthos; 09-09-2019 at 06:47 PM.
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post #2 of 6 (permalink) Old 09-09-2019, 06:55 PM
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If you have a factory power booster you'll need to replace the master cylinder (which you'll probably need to replace anyway) and, possibly, the pedal pushrod if it's not grooved for, and includes, the lock ring.

A correct '66 master cylinder should have the residual valve installed. If you're going to a dual bowl unit (MC36440) you'll need a 10# residual for the rear circuit. The existing distribution block and adjustable prop valve can stay.

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post #3 of 6 (permalink) Old 09-09-2019, 07:36 PM Thread Starter
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Quote:
Originally Posted by Woodchuck View Post
If you have a factory power booster you'll need to replace the master cylinder (which you'll probably need to replace anyway) and, possibly, the pedal pushrod if it's not grooved for, and includes, the lock ring.

A correct '66 master cylinder should have the residual valve installed. If you're going to a dual bowl unit (MC36440) you'll need a 10# residual for the rear circuit. The existing distribution block and adjustable prop valve can stay.
It's not a factory MC. It had a failed dual bowl in it when I got it and I added a new MC with a 1" bore. I have the pushrod with the lock ring. The power booster was added when I was having all my issues with the brakes not stopping the car good enough for me. The car never had power brakes.

Can I add the 10lb residual valve upstream from the adjustable proportioning valve?

66 Convertible, GT clone. 289 4V, C4. Springtime yellow with black top
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post #4 of 6 (permalink) Old 09-09-2019, 09:40 PM
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Quote:
Originally Posted by ophthos View Post
It's not a factory MC. It had a failed dual bowl in it when I got it and I added a new MC with a 1" bore.

Then you might find that a MC36440 with the 15/16" bore will work better without a booster. The 1" bore in a manual application MIGHT mean too much pedal effort but you can always try first.

I have the pushrod with the lock ring. The power booster was added when I was having all my issues with the brakes not stopping the car good enough for me. The car never had power brakes.

Perfect.

Can I add the 10lb residual valve upstream from the adjustable proportioning valve?
Absolutely. Anywhere between the master cylinder and prop valve will be fine.

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post #5 of 6 (permalink) Old 09-09-2019, 09:56 PM Thread Starter
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Originally Posted by Woodchuck View Post
Absolutely. Anywhere between the master cylinder and prop valve will be fine.
Thanks Woodchuck! Are the leaves changing up there yet? Always loved Skiing up there.

66 Convertible, GT clone. 289 4V, C4. Springtime yellow with black top
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post #6 of 6 (permalink) Old 09-09-2019, 10:03 PM
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Originally Posted by ophthos View Post
Are the leaves changing up there yet?
Is your health insurance paid up? Woodchuck bites can be hazardous!

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