Old Fire Guy Posted September 28, 2019 Report Share Posted September 28, 2019 Has anyone used the universal frame mounted 7-inch power brake unit offered by Pirate Jack? I'm thinking about using it on my '49 DeSoto S-13, over a firewall mounted unit. Any thoughts or experiences? Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted September 29, 2019 Report Share Posted September 29, 2019 18 hours ago, Old Fire Guy said: Has anyone used the universal frame mounted 7-inch power brake unit offered by Pirate Jack? I'm thinking about using it on my '49 DeSoto S-13, over a firewall mounted unit. Any thoughts or experiences? On my 1949 Desoto CV, I used the ECI front disc conversion. On the rear, I designed and made one myself. I am using a stock c.1951 single master cylinder with that pedal (the ratios were different between power and none power cars) and a trunk mounted midland-Ross remote power brake booster (Chrysler 1960-1964 RAM Induction cars or 1955-1957 T-Birds). The brakes are TOO strong. Like driving a 1960 Chrysler. If I were to do it again, and I will on my 1947 Desoto Suburban, I will use a dual master cylinder with the disc fronts and rear, but I will use the wilwood two piston calipers that one can use in place of the basic GM units. Less pedal effort with the two piston units. I will however make sure I have clearance for a booster like the one you show if it is not enough for the Suburban at 5500 pounds. James. 1 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 29, 2019 Report Share Posted September 29, 2019 James, the weight you class your suburban in is very high compared to the factory shipping weight as listed at 4012 lbs.....are you going on gross weight, all passenger and luggage? Quote Link to comment Share on other sites More sharing options...
Old Fire Guy Posted September 30, 2019 Author Report Share Posted September 30, 2019 I put my DeSoto back on the lift and immediately noticed the transmission (727) cross member (fabricated) would be in the way, which may not be an issue if I swapped the 727 for an A-518 OD trans as the cross member would have to be moved back anyway. I need to do some measuring. Quote Link to comment Share on other sites More sharing options...
Adam H P15 D30 Posted September 30, 2019 Report Share Posted September 30, 2019 Yup, have one in my 47. You can see the bracket in the picture. I trimmed the frame mount down a little in the front and welded it on, bolted the brake assembly bracket to it. Works good, clears the 518 crossmember. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.