Master cylinder replacement, 1987 m35a2c

[Bill in pa]

Hi.
This is Bill in pa.
Im finally replacing my master cylinder.
As I said I have a 1987 M35A2C.
Was a U.S.A.F. truck.
Has duel air paks
I ordered a new one based on what the truck is.
The one my wife is holding is the new one.
The other is the one that's in there now.
What do I need to order?
Thanks for any help
​

 

[Nomad1]

I believe the part # is 5934071 maybe it was because you said dual air not dual circuit

 

[rustystud]

That new master cylinder you have there is not a "dual" master cylinder but a single one. A new "Dual" master cylinder will run you about $250.00 to $300.00 easy. That one you have is for all the single circuit brake systems used on all the Deuce's until the late 1980's "Air Force" dual brake circuit Deuce's came out.

 

[davidb56]

I have the same year/model truck...I believe he needs a Raybestos MK 1624 master cylinder repair kit.

 

[Bill in pa]

Thanks for the help.
I completely explained to the guy what I have.
1987 M35A2C.
duel air paks U.S.A.F. truck.
Thats what he sent.

 

[WillWagner]

That new master cylinder you have there is not a "dual" master cylinder but a single one. A new "Dual" master cylinder will run you about $250.00 to $300.00 easy. That one you have is for all the single circuit brake systems used on all the Deuce's until the late 1980's "Air Force" dual brake circuit Deuce's came out.

Rusty, I dunno, that is not a FE777 MC, the outlet(s) are on the side and not at the rear, (single line) like the others I have seen. Also lokoks like a plastic reservoir. Looks like two outlets. Where do those two lines go?

 

[gringeltaube]

Rusty, I dunno, that is not a FE777 MC, the outlet(s) are on the side and not at the rear, ....

Guess Rusty was referring to the new MC held in hands, not the one installed.
Definitely not the correct replacement part.

 

[rustystud]

Guess Rusty was referring to the new MC held in hands, not the one installed.
Definitely not the correct replacement part.

Yes.
Though after looking at the picture again, it appears to have two ports. Confusing. Need some better pictures of the new unit. For sure it is not a M35A2 Dual master cylinder though.

 

[WillWagner]

Yeah, I was referring to the mounted pic. The replacement is the FE777 style. Sorry for the confusion.

 

[bigmike]

Sure looks like the one held in her hands is for the single circuit brake system. The old one still mounted to the truck is a dual circuit MC.

 

[Bill in pa]

there is a casting number on the mounter master cylinder.
2230600. Looks exactly like what in there.
If you look that number up there are 9 different ones.
Difference is the line out size.
I ordered one $126 with the parts guys discount.

 

[Nomad1]

I think the fact that master cylinder she is holding is upside down may be throwing some people. At any rate he should be able to get refund or exchange for right one. The supplier should be able to straighten this out let know how you make out.

 

[Bill in pa]

Called Boyce Equipment today.
Ordered a A3 master cylinder for my A2?
Go figure.
Sent pictures to match it up to.

 

[Bill in pa]

Well I Got the correct replacement Master Cylinder yesterday.
Ordered it from Boyce Equipment.
Put it in today.
Stops on a dime with 9 cents change.
No more pumping. Good firm pedal. Don't fade to the floor.

 

[Nomad1]

looks picture perfect

Well I Got the correct replacement Master Cylinder yesterday.
Ordered it from Boyce Equipment.
Put it in today.
Stops on a dime with 9 cents change.
No more pumping. Good firm pedal. Don't fade to the floor.View attachment 781358