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Old 05-10-2009, 10:40:29 PM   #1
CarNDrvr
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Master cylinder for 4 wheel disc swap?

Well, I bought a Wilwood master cylinder that they recommended to go with my 4 wheel disc conversion. It bolted up, but the pedal was mush until about 3" of travel. After talking with people who have been through this same ordeal, I was told to get a factory 4 wheel disc brake master cylinder. I ended up getting a 1979 Trans Am master cylinder for a 4 wheel disc brake car. My question is, should this one work for the Wilwood upgrade? It bolts right up like the old stock one. I know the stock disc/drum master doesn't work because of something about the rear brake amount of flow or something like that. Will the stock 4 wheel disc master cylinder disperse the fluid correctly for this application? Wilwood also mentioned a '71 Corvette master cylinder because of the fluid distribution also, but it doesn't bolt up. That's why I went with the T/A one.
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Old 05-10-2009, 10:46:11 PM   #2
gregh
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As far as I know, you'll need the TA disc brake proportioning valve too or you can get an aftermarket adjustable valve.
Otherwise, you won't be getting enough fluid to the back brakes to make them work properly.
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Old 05-11-2009, 01:20:15 PM   #3
BLUE72CAMARO
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You will need a different proportioning valve for sure. Should be any reason the wilwood master wouldnt work mine is rock solid on my car with a disk/disk prop. valve.
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Old 05-11-2009, 03:18:08 PM   #4
woody80z28
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The 71 Vette master should bolt up and work, that's the one I'm using.
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Old 05-11-2009, 05:47:48 PM   #5
CarNDrvr
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I'm eliminating the stock proportioning valve as per Wilwood's recommendation. They said it should go from the master to the front caliper with nothing in between. The rear should go from the master to the Wilwood prop. valve to the calipers. I have a Wilwood rear prop. valve inline already, but it comes before the stock prop valve.

Blue72...what exactly is your set up? Did you have to play with brake pedal rod position? Did you just bolt up the wilwood master to your brake booster while utilizing the stock rod? The said it may need adjusting to get rid of the 3" of dead pedal.
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Old 05-11-2009, 11:08:09 PM   #6
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Well my set up in a nutshell is hydraboost with wilwood master then into a factory disk/disk prop. valve. If I need to adjust the bias more I will install an adjustable one further down stream. But I did not have to play with rod length at all on mine just put in the little spacer bushing that came with master and installed it.
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