Different master cylinder ?

Suspension, Brakes, Tires, Wheels etc..

Different master cylinder ?

Postby flammulator » Sat Mar 04, 2017 12:48 pm

Hello from germany,
I need a new master cylinder.
1970 D200,383,power brakes.
I want to order it by Rockauto.
All the MC that will fit for my car are bolted on with 2 screws, bore 1,125 or bigger.

My one is bolted on with 4 screws and it's bore is 1".
These small ones i can find in trucks with the small block.

Whats wrong?
Sweptline.ORG Member
Sweptline.ORG Member
Posts: 78
Joined: Sun Feb 21, 2016 1:12 pm
City: germany
State: Foreign

Re: Different master cylinder ?

Postby MadMC63 » Sat Mar 04, 2017 8:42 pm

I read on this forum where a gentleman used one from a 72 with no problems. Said it was a bolt on with no mods.
1971 Dodge D100
So what's wrong with setting beneath a single pull string incandescent light bulb writing angry letters?
User avatar
Sweptline.ORG Member
Sweptline.ORG Member
Posts: 576
Joined: Sat Nov 14, 2015 12:16 pm
City: Rome
State: GA

Re: Different master cylinder ?

Postby moparbay » Wed Apr 12, 2017 1:41 pm

you can find the 4 bolt 1" bore master cylinder of you look under 1968 d100 w/383. Not sure why that is not listed for the 69-71. It might be that your current setup is not factory and some PO replaced the vacuum booster and master cylinder from an older truck??? I am by no means an expert historian on these trucks. I have always understood that the master cylinder for 4 wheels drums that has a bore of 1" was for manual brakes and the larger bores were for the power brakes. Smaller bore has more pedal travel but requires less effort where as a larger bore has less pedal travel but requires more effort, all things being equal that is.

Ole "Blue" 68 D100 Adventurer
65 W100
69 D100 converted to 4x4 (SOLD)
User avatar
Sweptline.ORG Member
Sweptline.ORG Member
Posts: 225
Joined: Wed Dec 31, 1969 6:00 pm
Location: Rapid City, SD
City: Rapid City
State: SD

Re: Different master cylinder ?

Postby Conrad » Wed Apr 12, 2017 8:31 pm

I ended up going back to eBay for an NOS item as I couldn't find one that I trusted would work. There are rebuilt A1Cardone master cylinders matching your description that will likely ship international.

I cross-referenced the part numbers and bought an 'NOS' rebuilt MoPar unit on eBay that was for late 71-73 Newport w/power front disc, as the part # matched what was used on the truck for 72-73. It was inexpensive. I'm now looking for a matching 4 post booster.
Sweptline.ORG Member
Sweptline.ORG Member
Posts: 155
Joined: Sat Jul 23, 2016 4:45 pm
City: Austin
State: TX


Who is online

Users browsing this forum: CSS-Registry, Galevin and 2 guests