Help?! Disc Brake Conversion with Remote Booster? (1964 300K Ram)

[TorqueChap <TorqueChap@xxxxxxxxx>]

Looking to tap this group's collective brain trust on an issue that has had every mechanic stumped from coast to coast. (No exaggeration.)

My '64 300K Ram has an AAJ front disc brake conversion done by a prior owner. However, the car's unique brake system (with remote booster under the driver side front fender) creates a situation that doesn't have an off-the-shelf solution that properly applies correct pressure to the front discs and the rear drums. The proportioning valve isn't an adequate solution in this case. Due to residual pressure in the master cylinder, a front disc conversion will create either drag on the rear drums or not provide sufficient breaking power to the rears. There is no middle ground. Spoke at length with both AAJ Brakes who ultimately recommended that I confer with Jeff Carter (JC Automotive). Jeff was totally stumped as well and said that no clear solution exists in the marketplace. This sentiment was echoed by several other folks I've since conferred with (including more technical members of the 300/letter car clubs). Here's a description of the problem, in verbatim, from my mechanic:

"Disc brake conversion on 300K ram not typical. 1963-64 letter car brakes. Front drum to disc conversion plumbing problem. Unlike typical conversion. Master cylinder to REMOTE BOOSTER has a single tube line to remote booster. Then from remote booster single line supply only is connected to typical distribution block for 2 front and one rear supply lines. Therefore typical conversion from dual master cylinder supply to rear drum(residual pressure) and Front Disc (no residual pressure) with remote booster is not feasible? Question is then of logistically plumb?"

Solutions for F/G letter cars do not apply to the J/K series. It's the K's remote power boost which is causing the problem. Mopar went with a remote boost since there was no room under the hood with the cross rams. 

Trying not to double back and reinstall drums on the front OR convert the rears to disc. Have to think there's a solution on how we can properly plumb the Ram K to accommodate front disc brakes and rear drums. 

Appreciate any and all thoughts. Double points for any solution that let's us use a dual master cylinder. Thanks in advance for the help!

David M.
New Jersey
300K Ram Convt AC
300L Convt AC

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