Correct Master Cylinder ??
Thread Starter
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Fleet Mechanic
Joined: Aug 2004
Posts: 1,311
Likes: 31
From: Nevada
Correct Master Cylinder ??
While my truck is running the best it has ever been, I've come to the conclusion that I installed the wrong MC when i did my brake system last year, its too small and will not return the brake pedal like it should, if anyone has the correct bore size or part# or recommendation that would be great, Im gonna start pecking thru my parts PDFs tonight, but thought I would ask first.... and yes i did use a measurement tool when adjusting the booster rod, but i remember looking at that MC and thinking "thats a bit smaller than the old one" and since i love doing things 2, 3 or 4 times i installed it anyhow..... cuz thats how i roll. 
76' F250 4x4 dual piston discs up front, no cruise control
76' F250 4x4 dual piston discs up front, no cruise control
Laughing Gas
Joined: Dec 2020
Posts: 869
Likes: 186
From: Near my truck
You might have fitted the 1'' MC instead of the 1.25'' MC.
Have a look here : https://www.rockauto.com/en/catalog/...+cylinder,1836
Check that your Booster is correct. The narrower fatter one pairs with the 1.25'' MC.
I don't particularly like the factory MC's, and fitted a modern aluminum/plastic one.
This one, from a 2002 F150, would fit perfectly should you wish to 'upgrade' : https://www.rockauto.com/en/moreinfo...1836&jsn=11091 (It is a 1.25'' MC even though it states 1'')
Have a look here : https://www.rockauto.com/en/catalog/...+cylinder,1836
Check that your Booster is correct. The narrower fatter one pairs with the 1.25'' MC.
I don't particularly like the factory MC's, and fitted a modern aluminum/plastic one.
This one, from a 2002 F150, would fit perfectly should you wish to 'upgrade' : https://www.rockauto.com/en/moreinfo...1836&jsn=11091 (It is a 1.25'' MC even though it states 1'')
Thread Starter
|
Fleet Mechanic
Joined: Aug 2004
Posts: 1,311
Likes: 31
From: Nevada
You might have fitted the 1'' MC instead of the 1.25'' MC.
Have a look here : https://www.rockauto.com/en/catalog/...+cylinder,1836
Check that your Booster is correct. The narrower fatter one pairs with the 1.25'' MC.
I don't particularly like the factory MC's, and fitted a modern aluminum/plastic one.
This one, from a 2002 F150, would fit perfectly should you wish to 'upgrade' : https://www.rockauto.com/en/moreinfo...1836&jsn=11091 (It is a 1.25'' MC even though it states 1'')
Have a look here : https://www.rockauto.com/en/catalog/...+cylinder,1836
Check that your Booster is correct. The narrower fatter one pairs with the 1.25'' MC.
I don't particularly like the factory MC's, and fitted a modern aluminum/plastic one.
This one, from a 2002 F150, would fit perfectly should you wish to 'upgrade' : https://www.rockauto.com/en/moreinfo...1836&jsn=11091 (It is a 1.25'' MC even though it states 1'')
Laughing Gas
Joined: Dec 2020
Posts: 869
Likes: 186
From: Near my truck
The OE 1'' MC has a 1/2 x 20 primary fitting and a 7/16 x 24 secondary fitting.
The OE 1.25'' MC has a 1/2 x 20 primary fitting and a 9/16 x 18 secondary fitting.
The 2002 F150 1.25'' MC has a 9/16 x 18 primary fitting and a 7/16 x 24 secondary fitting.
If your current MC is a 1'' bore, then you'd need a 1/2 x 20 (female) to 9/16 x 18 (male) adapter for the primary port.
If your current MC is a 1.25'' bore, then you'd still need a 1/2 x 20 (female) to 9/16 x 18 (male) adapter for the primary port, and a 9/16 x 18 (female) to 7/16 x 24 (male) adapter on the secondary port.
Adapters will work no problem, but, if you can access a tube cutter and pipe flaring tool, the MC would look neater with the correct tube nuts rather. (And you'd have one of the two required nuts already.)
The OE 1.25'' MC has a 1/2 x 20 primary fitting and a 9/16 x 18 secondary fitting.
The 2002 F150 1.25'' MC has a 9/16 x 18 primary fitting and a 7/16 x 24 secondary fitting.
If your current MC is a 1'' bore, then you'd need a 1/2 x 20 (female) to 9/16 x 18 (male) adapter for the primary port.
If your current MC is a 1.25'' bore, then you'd still need a 1/2 x 20 (female) to 9/16 x 18 (male) adapter for the primary port, and a 9/16 x 18 (female) to 7/16 x 24 (male) adapter on the secondary port.
Adapters will work no problem, but, if you can access a tube cutter and pipe flaring tool, the MC would look neater with the correct tube nuts rather. (And you'd have one of the two required nuts already.)
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