WTB AC Delco # 18M1036

[samkost]

I need a new AC Delco part# 18M1036 Master Brake Cylinder pictured.
AC Delco has changed the design style of the part from the older OE replacement style pictured. They have not changed their web photos or packaging.
Web site offerings are not offering this older OE style.
Thanks for any info, help or leads.

[bL.A.zer90045]

brand NOS master cylinder in factory oe replacement version----127.38 shipped.paypal or postal M.O accepted.ships from NM.

[samkost]

Originally Posted by bL.A.zer90045

brand NOS master cylinder in factory oe replacement version----127.38 shipped.paypal or postal M.O accepted.ships from NM.

PM sent.

[bL.A.zer90045]

I have this one from one of my 71 k5.its not acdelco or part number but new and finish related.lmk

[samkost]

Unfortunately not what I am looking for.
This very accessible and common style is what AC Delco has replaced the OE master brake cylinder that is shown in my original post.

Thanks for posting and good luck with your sale.

[bL.A.zer90045]

No problem and glwys.

[70STOVEBOLT]

Any results?

[samkost]

Originally Posted by 70STOVEBOLT

Any results?

I found a remanufactured master on eBay but have not done the install yet.
Other priorities lately have delayed the swap.
I really wanted a true AC Delco double bail unit but no luck locating one.
I am still debating whether I should just get the Corvette style Master Cylinder and a matching Proportioning Valve for an updated swap.
Just wanted to stay as close to original as possible.
My brakes presently work but maybe only 80% pedal feel of what it was before the trucks restoration.
I’m confident that a new Master and a brake system bleed will get the brakes back to 100%.
I’ll post the outcome soon.
Thanks for the reply.

[samkost]

I will double post this here and on the main forum posts to hopefully get more input from site members.
Just a follow up on my Master Cylinder dilemma and swap.
With help from a friend we swapped out the OE master cylinder with the new bench bled master, checked the correct gap for the long piston between the booster and the master ( 1/16”+ gap before pedal activation), and then bled the system starting at the right rear drum, left rear drum, right front disc then the driver side disc.
After a test start up to check for leaks I took it for a test drive only to have the same previous hard pedal condition. Could not lock up the brakes.
I did need to replace the master due to age and a little corrosion but now the focus is on a new faulty (less than 100 miles) POL Power Brake Booster.
I did the two pedal tests and it failed both.
I then ran the engine for a few minutes, turned it off and 30 seconds later unplugged the power booster check valve.
No hissing or escaping air at that point. Booster check valve tested good.
I then got a vacuum gauge to the carburetor vacuum line and found 16 in. Hg of vacuum. I believe and hope that this is good enough vacuum.
So after every said and done, turns out I may have a brand new faulty POL Power Brake booster. I have heard that others have had brand new bad booster issues out of the box.
I will call POL on Tuesday and see what they have to say.
I may just go with my OE original functioning black painted Delco Moraine power booster and forget the pretty Cadmium plated after market market booster. no more bling!
I love working and learning about my truck.
Any advice and input would again be appreciated.
Thanks all,
Sam