Re: [Chrysler300] Double master cylinder on J/K Ram Cars

I did a dual reservoir master cylinder on my Stroker, 5 speed, EFI Ram K when converting to 4 wheel discs. I had a late model aluminum MoPar Performance part on the adapter (2 bolt master to 4 bolt firewall) and it was the large 1-1/8" bore cylinder. Pedal was high and firm ,required two feet to stop the car which is tough when you've got the manual trans equipped, tiny brake and clutch pedal. Went to a 1967ish, smaller,dual reservoir iron master, sent it out to have it stainless steel sleeved and rebuilt with no residual check valves and tried that. It also had a smaller 1.00" bore. Theory is it creates higher pressure more suited to a non-power application but the trade off is a longer throw and so much throw it was scary. Neither part left any confidence to drive the car let alone stopping abruptly should the need arise.

Next up we swapped in a freshly rebuilt original slave/booster setup but plumbed only the front brakes through it at the suggestion of Roger at AAJ and couldn't get any, as in zero, pedal with either large or small bore master cylinder. Not sure if the (GM) disc brake caliper required so much volume that the slave portion of the cylinder couldn't fill it.. I'd be surprised as those single piston calipers are puny by today's standard. Tried everything we could dream up, even putting some (I think) 2lb residual valves inline to see if that helped. With the only thing remaining to try being an electric master cylinder guaranteeing up to 2000psi at a cost of about $1400 I threw in the proverbial towel and put the 4 wheel drums and single (although stainless sleeved) master back on the car. (At some point I'll sell off the EFI, rams and stroker engine and go back to my carbureted 413... and probably ditch the 18" Centerline billet wheels for the caps and whitewall tires and enjoy the car relatively stock again)

In the early 90's I was stuck with the 4 wheel drums without a remote booster for the first two years I had my K convertible. It wasn't pleasant but I got by until I came across a rebuildable booster ( mine was rotten through and through ). I don't know why you wouldn't run power brakes if you've got the correct parts. Get it rebuilt and stainless steel sleeve everything. I'm not sure the perceived added safety factor of the dual reservoir offsets the lack of stopping distance when sacrificing power assist on such a big car.

Michael Laiserin

-----Original Message-----
From: Keith Langendorfer keith_A_Lang@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
To: Chrysler300@xxxxxxxxxxxxxxx <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Tue, Apr 23, 2019 5:10 pm
Subject: [Chrysler300] Double master cylinder on J/K Ram Cars

Hi Folks

Has anyone done this? Was wondering if the longer master cleared the rams on the driver side. I’m installing a manual master brake system on the 4 speed K to allow for the ram intake on the drivers side (I’m not interested in doing a remote brake booster) and am considering a dual master for the usual safety reasons

Any feedback would be appreciated!

Keith

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Posted by: Mwl1967 <mwl1967@xxxxxxx>

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