I searched and could not find anything on this subject. Would a 1968 power booster and dual MC fit on a 1966 model? I know I would have to add a line and change the proportioning valves.
Joined: Sat Aug 19 2006, 05:03PM
Location: Ontario, Canada
Posts: 2919
If you just want to convert from single to a dual reservoir MC that is fairly easy. There is no prop valve on a car with all-drum brakes. The brass block down on the frame rail is just a simple distribution block. You don't need to change it at all. Just cap-off one port after removing the line for the rear brakes.
If you have power brakes now, the 1967+ dual reservoir MC will bolt to your existing booster. If you're talking about converting manual brakes to power brakes at the same time, that is a different matter.
Joined: Sat Aug 19 2006, 05:03PM
Location: Ontario, Canada
Posts: 2919
jazzandmoparguy wrote ... Just as you already said, change the distribution valve and bend up a couple of new lines and fittings, bleed it and you're good to go.
There's no need to change the distribution block, Ross.
Remove the rear brake line from the MC and connect a union to a short line that connects to the front reservoir on the mc. Plumb the rear reservoir on the MC (for the front brakes) to the port on the distribution block that used to be for the rear brakes. That port uses a standard fitting size so it's easiest to work with. Then get a Weatherhead plug to cap-off the port on the top of the distribution block that used to connect to the single-pot MC.
The only other trick is you need to get some reducers that screw into the two ports on the new MC to reduce them to standard brake line fitting size.
Unfortunately I can't find the part numbers for the reducers you need for the MC. I'll keep looking, but in the worst case you'll have to stand at the parts counter with your new dual-res MC in hand and find the right ones.
Joined: Thu Jan 05 2006, 12:03PM
Location: San Gabriel, CA
Posts: 701
I used the part below from Inline Tube to convert my '65 Chrysler to a dual master.
BLK241 1962-64 A, B, C-body Distribution Block - Polara / Dart / Coronet / Fury / Belvedere
Tee Block - Brass 5 Port Valve Front Drum - Rear Drum Dual Master Conversion
Brass $35.00
Valve Notes:
For use on 1962-64 cars converting to dual master cylinder or disc brakes.
This is the distribution block that is mounted below the single master cylinder which feeds fluid to all four wheels. This block is designed to replace the single master cylinder block in the stock location. For the first time, cars can be upgraded to dual master cylinders or disc brakes while keeping the factory appearance. This block mounts in the same location as the old block and allows you to reuse most existing brake lines.
Dual Master - If you are converting to dual master cylinder leaving the drum brakes, simply mount this block in the same location, hook up the right and left front brake lines and hook up the front to rear. Two ports are left - You will have to make 2 master cylinder lines both in 3/16". This block makes conversion a snap.
Disc Brakes - If you are converting to disc brakes with dual master, simply mount this block in the same location, hook up the right and left front brake lines and hook up the front to rear. The 2 top ports are left - You will have to make 2 master cylinder lines in 3/16". With this block you will need to plumb in an adjustable prop. valve to tune down the pressure to the rear brakes. This valve can be mounted anywhere in the front to rear brake line.
1964-66 cars all had a single master cylinder with drum brakes. There was no proportional valve and no disc brakes available in these years. The tee block that mounted to the frame served as the distribution block. When converting to disc brakes, the system will need a prop. valve. This aftermarket valve mounts on the frame similar to the 64-66 cars or on a bracket below the master.
1967-70 cars all had a dual master cylinder and also 1967 was the first year for disc brakes. If the car had drum brakes, there was a distribution block with a built-in brake warning switch. If the car had factory disc brakes, it used the drum dist. block in conjunction with a disc brake hold off valve, which made the disc cars a 2 part valve. For disc brake conversions, replacement after market 1 piece valves are available, see listing.
WOW thanks for the fast info, I am trying to get better and safer brakes, mine just don't seem to grab well. It acts like there is a delay, meaning it takes maybe a half a second to really start grabbing. Plus I just don't trust a one line system for the obvious reasons.
I do have a power booster and all four drums. That would be great to just need a new MC, plus lines.
Joined: Sat Aug 19 2006, 05:03PM
Location: Ontario, Canada
Posts: 2919
Weatherhead part numbers: 131X4 1/4" inverted flare plug (for top of distribution block) 302X3 3/16" inverted flare union (plumb rear brakes to front port on MC) 7909, 7910 master cylinder adapters
The MC port adapters are also available under the following part numbers: FMSI #3230, 3231 AGS #BLF-20, BLF-27
