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master cylinder brake line nut sizes larger under small reservoir
and smaller under larger reservoir. Is this normal. I just got a replacement and it's new not rebuilt. Sizes don't work and are reversed it is large nut under large reservoir and small nut under small reservoir. Thanks in advance for any comments.
Oh, 1982 F250 300 l6 custom under 8500
(update: think I just figured it out, mine is a two piston? Think there are 3 options for the master cylinder by the looks of photos for products being sold, mines a 2 piston, maybe it's the camper option truck?)
I have heard some? 250's had dual piston calipers but dont know about the master as I have not had the need to look into them on a 250.
I can tell you the large reservoir go's to the disc brake side of the system so that should be the front.
Now I dont know if this holds true with our trucks but just had problems getting the right master for a Jeep DJ (mail Jeep) that has non-power 4 wheel drum brakes.
Both Rock Auto and the local parts store had the wrong master for both the DJ and CJ (normal Jeep).
It was for power brakes so the rod would not fit and the line nuts were swapped and 1 a different size.
I thought it was just the nut size so I put the right size on after flaring and found the master was wrong
I ended up ordering a master for a 75 AMC Gremlin with a v8 non-power 4 wheel drum brakes. I got that Gremlin and why I knew what master to look at.
It fit the firewall & rod but I had to put the old nut back on the line and all works as it should. Now to finish fixing the floor rust I can take the Jeep for a test drive
So sometimes you need to look at other makes for a part to work.
Dave -----
FWIW, here's my 86 F150 302EFI. The nut on that rear brake line is larger then the the nut on the forward bvrake line. Is that what your talking about ?
The old MC had some brass adapter in one of the brake line ports.
The front smaller reservoir goes to the rear brakes. The larger rear reservoir goes to the front disc brakes. If you follow the lines down to the proportioning valve, the line on the front of the proportioning valve will be the front disc brakes, the line going to the rear of the proportioning valve will be the rear drum brakes. You can usually buy adapter fittings to make things work.
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