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Question on power to manual brake conversion

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Old 01-13-2019, 03:40 PM
  #21  
corvettedave383
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Originally Posted by Richard454
I've got the 7/8" as well- they don't make anything smaller in the tandem style.

It was recommended as I'm running 14" 6 pistons calipers
same as me, got 6 pots and 14's, work great
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Old 01-13-2019, 09:30 PM
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scottjamison
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Originally Posted by derekderek
Bought a 75 at the auction. halfway home I got out to pull the cap and see what's wrong with the brake fluid level. I realized there was no power booster. I can't understand anybody removing power brakes.
If your system is built for manual, then it will work well.
My engine doesn't have enough vacuum for the booster without the extra pump. Manual brakes are the right answer instead of the vacuum pump workaround.
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Old 01-13-2019, 09:31 PM
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Originally Posted by corvettedave383
Iam using the 7/8" master cylinder from wilwood, Iam sure they dont do a 3/4?

i did a power to manual conversion, the manual brakes work great, the 7/8 gives more line pressure, so easier on your leg
Yeah I've had extensive conversations with multiple techs from Wilwood. They all say 1" for manual. 1 1/8" for power.
I already have a 1" so I will start with that anyway.
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Old 01-14-2019, 05:55 PM
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Originally Posted by scottjamison
Yeah I've had extensive conversations with multiple techs from Wilwood. They all say 1" for manual. 1 1/8" for power.
I already have a 1" so I will start with that anyway.
do you still have factory calipers and disc's?
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Old 01-14-2019, 05:56 PM
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Originally Posted by corvettedave383
do you still have factory calipers and disc's?
Yep. They're holding down my garage floor currently.
I have Wilwood four piston calipers and new Wilwood rotors all around on the car.
Last edited by scottjamison; 01-14-2019 at 06:02 PM.
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Old 01-14-2019, 06:36 PM
  #26  
corvettedave383
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Originally Posted by scottjamison
Yep. They're holding down my garage floor currently.
I have Wilwood four piston calipers and new Wilwood rotors all around on the car.
ok maybe its cos ive got the bigger discs and 6 pot wilwood calipers, thats maybe why they told me to buy the 7/8 master
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Old 01-14-2019, 07:25 PM
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Originally Posted by corvettedave383
ok maybe its cos ive got the bigger discs and 6 pot wilwood calipers, thats maybe why they told me to buy the 7/8 master
It's in the Owner's manual for the big brake kit.....




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Old 01-14-2019, 07:53 PM
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Originally Posted by Richard454
It's in the Owner's manual for the big brake kit.....



That's for a different set of calipers.
Mine are the 140-10789 set.
Here are the requirements for that.


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Old 01-14-2019, 08:01 PM
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Originally Posted by scottjamison
That's for a different set of calipers.
Mine are the 140-10789 set.
Here are the requirements for that.
EXACTLY- I had referenced Dave's comment on the smaller MC.

When in doubt- read the owners manual!!!
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Old 01-14-2019, 08:03 PM
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Originally Posted by Richard454
EXACTLY- I had referenced Dave's comment on the smaller MC.

When in doubt- read the owners manual!!!
Zac'ly.

Although I am still bitter that the original guy at Wilwood never asked me about which calipers I had when he recommended the 1" bore for the power brakes. At least I can re-use that MC for the manual!
At least Keith made sure he knew which calipers I had before recommending the 1" for manual.
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Old 01-14-2019, 09:26 PM
  #31  
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Originally Posted by ratflinger
Hydraboost?
Ditto.... If you have power steering it doesn't take much to plumb in a hydrobooster. There are some really small kits out there for it too. Here is a unit that is a direct bolt on for a C3 http://www.powerbrakeservice.net/new...ydroboost.html
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