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Old 12-29-2011, 10:42 PM   #1
Mieser3
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Which Master Cylinder Bore Size?

Looking to purchase my Wilwood master cylinder and Wilwood proportioning valve so that I can finally finish up my brake system but I'm unclear on which bore size I need. I am running Wilwood D52 dual piston calipers front and back with 3/16" stainless steel brake lines. I plan on getting this proportioning valve:

http://www.wilwood.com/MasterCylinde...emno=260-11179

I will be getting this master cylinder:

http://www.wilwood.com/MasterCylinde...mno=260-8555-P

There are 3 different bore sizes available: 7/8", 1" or 1 1/8". Which bore size do I need for my application?

Thanks!
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1956 Chevy 210 Sedan
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1970 Chevelle SS 396 (numbers matching L34 car)
1971 Chevy SWB Fleetside with 1967 front clip - in progress
My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=438156
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Old 12-29-2011, 10:54 PM   #2
edhtrd71
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Re: Which Master Cylinder Bore Size?

I think the stock size is 1 1/16. I wish I could help recomend which one. You could call wilwood. 1 inch will give more pressure less volume, 1 1/8 will give more volume less pressure. I hope someone chimes in, im interested to know which aluminum master will work well also.
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Old 12-29-2011, 10:57 PM   #3
lolife99
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Re: Which Master Cylinder Bore Size?

I'm going to use the 1" bore without a booster on my stepside.
3/16" brake lines also.
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http://67-72chevytrucks.com/vboard/s...d.php?t=444823
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Old 12-29-2011, 11:04 PM   #4
Mieser3
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Re: Which Master Cylinder Bore Size?

I forgot to mention that I'll also be running an 8" dual diaphragm booster as well.

Interested to see what is recommended......
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1956 Chevy 210 Sedan
1970 Camaro Z-28/RS
1970 Chevelle SS 396 (numbers matching L34 car)
1971 Chevy SWB Fleetside with 1967 front clip - in progress
My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=438156
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Old 12-29-2011, 11:24 PM   #5
kpeztruck
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Re: Which Master Cylinder Bore Size?

I highly recommend calling the tech dept at Wilwood. That is what I did years ago on my build, and they pointed me in the right direction. Paul
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Old 12-30-2011, 01:29 PM   #6
Mieser3
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Re: Which Master Cylinder Bore Size?

I spoke to the tech dept. at Wilwood and they told me to use the 1 1/8" bore for my setup. Just thought you guys might be interested in their recommendation.
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1956 Chevy 210 Sedan
1970 Camaro Z-28/RS
1970 Chevelle SS 396 (numbers matching L34 car)
1971 Chevy SWB Fleetside with 1967 front clip - in progress
My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=438156
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Old 12-30-2011, 01:34 PM   #7
Scottshotrods
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Re: Which Master Cylinder Bore Size?

1 1/8 bore is what we have been useing on wilwood master and this is with out a booster and it works great with wilwood d52 this way.

So you know we have these instock and have some great prices on them !!!

Justin
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Old 03-07-2012, 10:10 PM   #8
RdoubleU
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Re: Which Master Cylinder Bore Size?

Quote:
Originally Posted by lolife99 View Post
I'm going to use the 1" bore without a booster on my stepside.
3/16" brake lines also.
Quote:
Originally Posted by Mieser3 View Post
I spoke to the tech dept. at Wilwood and they told me to use the 1 1/8" bore for my setup. Just thought you guys might be interested in their recommendation.
Jay / Keith - can you give any detail into what you had to do with the brake pedal pushrod with these MC?

Wilwood stated the 7/8 MC came with a new pushrod but the 1 and 1 1/8" bores did not.

Does the factory pushrod work with no issues?
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Old 03-07-2012, 10:45 PM   #9
lolife99
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Re: Which Master Cylinder Bore Size?

Quote:
Originally Posted by RdoubleU View Post
Jay / Keith - can you give any detail into what you had to do with the brake pedal pushrod with these MC?

Wilwood stated the 7/8 MC came with a new pushrod but the 1 and 1 1/8" bores did not.

Does the factory pushrod work with no issues?
My master cylinder push rod worked fine.
You want between 1/8" and 1/4" freeplay in the pedal pushrod.
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Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
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Old 03-07-2012, 10:54 PM   #10
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Re: Which Master Cylinder Bore Size?

Thanks Keith, I'm going with the 1" manual setup as well so Good to know it worked for you
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