A question on a M1009 that has probably been asked 1,000 times

[JAD561]

So, I haven't been on the site for over 3 years due to multiple deaths in my family and then my own struggle with Covid, so here goes.
My 1984 M1009 has basically sat for 3 years without starting. We changed out the batteries and have it running. My issue is, on my last State Inspection in 2017, I had my fluids topped off. Apparently the service station mixed DOT 5 Brake Fluid in with the DOT 4 fluid that I was using. so now the master cylinder needs to be replaced due to the sludge in the reservoir from the seals breaking down.

So my question is, can anyone provide a replacement number for the Master Cylinder? I always had good luck at Napa and Autozone on parts,
but I can't seem to get an answer other than "This one might work" So any help would be greatly appreciated.

 

[JAD561]

So, I haven't been on the site for over 3 years due to multiple deaths in my family and then my own struggle with Covid, so here goes.
My 1984 M1009 has basically sat for 3 years without starting. We changed out the batteries and have it running. My issue is, on my last State Inspection in 2017, I had my fluids topped off. Apparently the service station mixed DOT 5 Brake Fluid in with the DOT 4 fluid that I was using. so now the master cylinder needs to be replaced due to the sludge in the reservoir from the seals breaking down.

So my question is, can anyone provide a replacement number for the Master Cylinder? I always had good luck at Napa and Autozone on parts,
but I can't seem to get an answer other than "This one might work" So any help would be greatly appreciated.

and I apologize in advance because I couldn't remember how to post and wound up here

 

[cucvrus]

Duralast New Master Cylinder (Brake System) NM1863

Shop for Duralast New Master Cylinder (Brake System) NM1863 with confidence at AutoZone.com. Parts are just part of what we do. Get yours online today and pick up in store.

www.autozone.com

I have used many of these.

 

[shotty]

Just to clarify, DOT 5 fluid is what should be in there, as that is what the govt used. If you were using DOT4 without flushing everything out, now would be a good time to do that before installing the new master cylinder. Use whichever fluid you want but make sure to flush the system and dont let anyone mix them.

 

[Tinstar]

One of these decals might help in the future.