MC 1-1/16 vs 1-1/4
09-17-2015, 12:36 AM
#1
Member
Thread Starter
MC 1-1/16 vs 1-1/4
1999 F150 4x4 Off-Road with trailer option.
5.4L, Auto, 5-lug wheels.
4-wheel DISC brakes
I purchased a Motorcraft Master Cylinder
#BRMC-69
F75Z-2140-NC
It is stamped "1-1/16"
The MC on the truck looks identical, except
it is stamped "1-1/4"
I do NOT know if the MC on the truck has been changed or not.
My questions...
Which is the correct MC?
1-1/16
1-1/4
Does it matter?
Can either be used?
Will there be a difference is braking?
5.4L, Auto, 5-lug wheels.
4-wheel DISC brakes
I purchased a Motorcraft Master Cylinder
#BRMC-69
F75Z-2140-NC
It is stamped "1-1/16"
The MC on the truck looks identical, except
it is stamped "1-1/4"
I do NOT know if the MC on the truck has been changed or not.
My questions...
Which is the correct MC?
1-1/16
1-1/4
Does it matter?
Can either be used?
Will there be a difference is braking?
Last edited by TheFireman; 09-21-2015 at 10:09 PM. Reason: added 4-wheel disc description
09-17-2015, 01:32 AM
#2
Senior Member
This is just a complete guess here, one could be for disc rear brakes and the other from drum rear brakes, but again, I know. What rear brakes do you have? I'll look at my numbers in the morning.
09-18-2015, 09:28 AM
#4
MC 1-1/16 vs 1-1/4
Originally Posted by TheFireman
1999 F150 4x4 Off-Road with trailer option.
5.4L, Auto, 5-lug wheels.
I purchased a Motorcraft Master Cylinder
#BRMC-69
F75Z-2140-NC
It is stamped "1-1/16"
The MC on the truck looks identical, except
it is stamped "1-1/4"
I do NOT know if the MC on the truck has been changed or not.
My questions...
Which is the correct MC?
1-1/16
1-1/4
Does it matter?
Can either be used?
Will there be a difference is braking?
5.4L, Auto, 5-lug wheels.
I purchased a Motorcraft Master Cylinder
#BRMC-69
F75Z-2140-NC
It is stamped "1-1/16"
The MC on the truck looks identical, except
it is stamped "1-1/4"
I do NOT know if the MC on the truck has been changed or not.
My questions...
Which is the correct MC?
1-1/16
1-1/4
Does it matter?
Can either be used?
Will there be a difference is braking?
09-21-2015, 09:06 PM
#5
Member
Thread Starter
Pictures
Picture of existing MC showing showing 1-1/4
and new MC (both sides) showing 1-1/16
notice location of stamping on left-side,
directly under tank,
in front of mounting boss...
(and sorry for the delay, I pulled four shifts at the firehouse...)
and new MC (both sides) showing 1-1/16
notice location of stamping on left-side,
directly under tank,
in front of mounting boss...
(and sorry for the delay, I pulled four shifts at the firehouse...)
Last edited by TheFireman; 09-21-2015 at 09:10 PM. Reason: added description of location
09-21-2015, 09:15 PM
#6
Member
Thread Starter
Reason to buy new Motorcraft
The reason I purchased the Motorcraft was it is all-new , AND it included ALL the attachments;
tank with grommets,
electrical connector,
and whatever that extra connector on the rear-most line outlet is...
tank with grommets,
electrical connector,
and whatever that extra connector on the rear-most line outlet is...
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09-21-2015, 10:01 PM
#8
Senior Member
I have drum brakes in the rear and my stamp on that pump says 1 1/16. I'm just going to assume that the 1 1/16 is for drum rear brakes and the 1 1/4 is for disc rear brakes. The reason I assume that because when I looked into changing from drum to disc they said I would have to change the master cylinder. Do you have disc rear brakes, or drum?
09-21-2015, 10:56 PM
#10
Senior Member
It is a production change in 12/99. They used 1 1/8 prior to that date, except for certain applications. If you would of ordered your m/c for before that date, you should have the regular sized one. After 12/99, Ford shows the updated m/cyl. Hope that gives you some info. Your part number shows for 1997 to 1999 Ford F150 with 2wd and cc and rear disc brakes.
RAYBESTOS MC390183 will give you the correct part. Good luck.
RAYBESTOS MC390183 will give you the correct part. Good luck.