Disc brake Conversion trouble 72 cutlass
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Registered User
Joined: May 2018
Posts: 14
From: Marne Mi
Disc brake Conversion trouble 72 cutlass
completed a drum to disc conversion on the front wheels only and can’t seem to get a good petal it’s drivable but won’t lock up brakes I have blead them several times and also bench blead the master before installing any thoughts ?
Registered User
Joined: Nov 2009
Posts: 3,009
From: Red Oak, Texas
Do you have access to a pressure gage? Check front pressures versus rear. Also, did the kit come with the master cylinder? You may need to change to a smaller diameter master to get better pressure.
Thread Starter
Registered User
Joined: May 2018
Posts: 14
From: Marne Mi
Might be able to get pressure gauge kit I bought cane with everything just wondering about pin length from the booster to the master it came with the short pin in the booster and the “bullet” for the master but I’m wondering if it should have the longer pin there were no instructions on what to use
Old(s) Fart
Joined: Mar 2007
Posts: 50,832
From: Northern VA
Either you still have air in the system (the most likely cause) or you have a mis-adjusted pushrod either between the booster and M/C or between the booster and the pedal. The brake system is not complex. There aren't a lot of other potential causes here.
Registered User
Joined: May 2014
Posts: 256
From: Mokena, IL
I did the same upgrade on my 1972. The proportioning valve gave me fits when trying to bleed the rear brake. You have to ensure that the valve piston is centered between the front and back brakes during the bleeding process. You should remove the switch at the top and visually inspect the valve piston to ensure it's centered and center it if it is not. I used a small pick to move the valve piston to center and then the bleeding was successful. I also purchased a bleeding "tool" that held the piston steady during the bleed. You can get one here:
https://www.speedwaymotors.com/Speed...iABEgLPevD_BwE
Hope this helps -
https://www.speedwaymotors.com/Speed...iABEgLPevD_BwE
Hope this helps -
Thread Starter
Registered User
Joined: May 2018
Posts: 14
From: Marne Mi
I had some trouble with that in the beginning but I’m pretty sure that if fine I tested it with a test light to check and make sure it wasn’t pushed to one end so hopefully I can just get it by more rounds of bleeding!
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