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Hello gentlemen, the previous owner did a front disc brake conversion on my 69 F100 and said he used the spindles from a 1973 truck...he said it was an F150 but either got the year or the truck wrong. The brakes work okay but have always been a bit soft and feel a tad under-powered, though the braking is quite progressive, which I like.
Given the lack of power, I've always wondered whether the booster/MC combo were left in place from the drums all round setup and might not be well matched to the disc/drum setup I have now. Anyway, the booster has started making a hissing noise when cold, the first few times I depress the pedal, so I bought an A1 Cardone 503009 MC/Booster, which Rock Auto list for 73-76 F100 and F250's as well as for 75-76 F150's with front disc brakes.
But this arrived today and looks to be no good as the booster is just too wide....about 11.5" diameter compared to about 8.5" diameter for my existing booster. The valve cover will either be in the way or it will fit so close that if I wanted to replace the valve cover gasket I'd have to remove the booster! I can't see how Rock Auto can list this for the 73-76 F100's unless they have wider engine bays.
Can anyone advise what MC and booster I need?
Thanks for any advice or comments....and here's a couple of picture of my current setup.
I have the same Booster from a 76 f-150 and although it looks close you should still be able to take the valve cover off and replace the gasket if need be without removing the Booster....is the picture of your old Booster or the new one?
I have the same Booster from a 76 f-150 and although it looks close you should still be able to take the valve cover off and replace the gasket if need be without removing the Booster....is the picture of your old Booster or the new one?
The photos are of my existing one....the new one is 3" wider. Are you saying you have what I have now, in the photos, or you have the new one I just got?
The booster you have pictured is the small diameter single diaphragm booster. The Cardone number you mentioned is for a dual diaphragm booster (exactly like what I have in my '69 F100).
I don't see a photo of the one you mentioned just getting from the parts store but, by your description, I'm fairly certain you're talking about the large diameter single diaphragm booster that was designed to be mounted high on a bellcrank style firewall bracket assembly.
I think this must be the large diameter single diaphragm booster, as you say.
As regards the one you have, can I just check, is it this one? Part number is Cardone 503112 (with MC...not sure what bore)) or Cardone 5473112 (without MC)
Also, on the Fordification thread I started (also posted here because seem to get more responses on FTE), you mentioned that you matched your booster with a 95 Explorer 1-1/16" bore master cylinder. Do you recall the make/part number at all?
The booster you just received isn't the one like I posted a photograph of however, it is a single diaphragm booster and it is designed to mount to a bellcrank (cantilever) firewall bracket assembly --as denoted by the short input rod going into the back of the booster. Boosters not mounted to a bellcrank bracket assembly will have a long input rod coming out of the back of the booster.
I didn't order my dual diaphragm booster with a MC. I bought it and the MC separately. The part number for my booster is O'Reilly's 54-73112.
My disc/drum brake valve is for an '84-'86 Ford F150/Bronco.
The brake line connections on my MC are ISO metric bubble flares --M10 x 1.0 primary port fitting and an M12 x 1.0 secondary port fitting. These fittings can be purchased through Classic Tube. The M10 x 1.0 fitting is part number ST8036. The M12 x 1.0 fitting is part number ST8040.
The rest of my brake system hard line connections are SAE 45° inverted (double) flares. The standard fitting size for 3/16" hard brake line tubing is 3/16"-24. Ford also used specialty sizes of brake line fittings for use on 3/16" hard lines in 7/16"-24, 1/2"-20 and 9/16"-18. These are generally not stocked by automotive supply houses. These fittings can also be bought brand new through Classic Tube.
The 7/16"-24 fitting (color code red) is part number ST8006.
1/2"-20 fitting (color coded black) is part number ST8007.
9/16"-18 fitting (color coded gold) is part number ST8010.
(3/16" diameter hard brake tubing is also the same diameter as 4.75mm brake tubing).
Okay, I decided to stick with the stock looking, steel MC, but have taken your advice and chosen a new one (not re manufactured) and with 1-1/16" bore.
I've also bought the 5473112 dual diaphragm booster, but haven't yet been able to locate a suitable brake valve yet. Looks like my truck still has the stock drum/drum pressure differential valve, so without proportioning I believe.
Is there any truth to the 67' master cylinder being different to the later years? If so it's something to watch for.
The only difference I know of is the pushrod on a '67 manual brake MC is shorter than the pushrod on a '68-'72. If the truck has power brakes, again the pushrod going into the back of the booster on a '67 is shorter than the one on a '68-'72 model.
On the O'Reilly website, there's no difference in part number for the MC itself between a '67 model vs. a '68-'72 model truck.
'67 pedal support shown at the bottom of the photo. '68-'72 pedal support shown at the top of the photo. Notice the placement of the brake pedal pivots. The '67 brake pedal pivot is closer to the front of the pedal support --which would make the connection point of the manual brake MC/brake booster pushrod shorter in length, compared to a '68-'72.
Ultra, do you know if that master cylinder will work with these booster brackets I purchased from Orich?
The brackets have no bearing on the type of MC used. That's determined by the booster since the MC mounts to the two studs on the face of the booster (opposite side of the booster from the mounting brackets).
Either a long input rod single diaphragm booster or, a long input rod dual diaphragm brake booster will mount to those brackets.
The brackets have no bearing on the type of MC used. That's determined by the booster since the MC mounts to the two studs on the face of the booster (opposite side of the booster from the mounting brackets).
Either a long input rod single diaphragm booster or, a long input rod dual diaphragm brake booster will mount to those brackets.
Sorry... I meant booster, but I typed master cylinder.
So, will that booster (5473112 dual diaphragm booster) will work on those brackets?
05-10-2016, 12:14 PM
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