What size are the original roadrunner wheel cylinders compared to your 61? If
your 61 wheel cylinders are much bigger, maybe you don't have enough fluid
capacitiy in the road runner master cylinder.. just a guess...Also, you may not
have enough pedal travel or you shortened the rod too much? Good luck with your
project!
Clough Bruce T CIV AFRL/VACC wrote:
> Esteemed List,
>
> Okay, what did I do wrong, or which assumptions were wrong, modifying our 61
> Fury to a dual system? I fitted a 69 Roadrunner master cylinder to the car,
> shortened the pedal-to-cylinder rod to fit, made the appropriate line mods,
> bled the system (yes, the master cylinder was bench bled before put on the
> car), and the pedal goes to the floor and it won't "pump up" stiff (even
> without the engine running). The car has original power brakes (bellows
> type). Assumptions I made:
>
> 1. Used manual 69 Roadrunner master cylinder.
> 2. Could put this in place of existing single cylinder without modifying
> bellows assembly.
> 3. Amount of fluid master cylinder would push is enough to actuate brakes.
>
> Yes, the air is out of the system, I'm sure of that. Any ideas on where I
> go from here? Do I actually have to install the total power brake system
> from a later 60's Mopar, including diaphram assembly to get it to work
> right, and remove the bellows?
>
> The single system is going back on the car this weekend. My wife is getting
> tired of me stealing her Blazer!
>
> Thanks!
>
> Bruce Clough
> 61 Newport - winter storage
> 61 Fury - daily driver up until this week!
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