Good afternoon, I'm new to the forum. I just posted on the new member site and would appreciaue any help you might give my with my current problem.

I've got a 68 F-100 360, 3 speed, manual brakes. I've had it for about 5 years, worked on it as time permitted and have it in pretty good shape, or so I thought.
I started having some brake problems, the brake pedal was very hard with little braking but it would suddenlt depress and the front passenger side brake would stick in the expanded position. I bought a cylinder kit. When I took it down the cylinder was clogged with sludge so I flushed the system with fresh fluid throught the master cylinder. I thought I had it fixed but it's doing the same thing again. I'm thinking its the porportioning valve but I can't find and information about it or even find one. One supply house told me its not a proportioning valve, it's just a 4 way splitter with a connection for the brake warning light wiich is on now.
'
Can I take this valve or whatever it is apart and clean it out or is there some suitable replacement for it like an adjustable valve? Any advice will be much appreciated. I just put $500.00 in tires on this truck, buffed and waxed it and now its decorating my driveway.

 

Tony65 Welcome to FTE & the Bumpside Forum.

Your truck wont have a proportioning valve unless it has a power disc brake upgrade. Don't know what you might be referring to. As I did to my 66, I would do a power disc upgrade, if that is not in your cards just now replace & rebuild everything in the system. It is very old and your life is worth it.


John

 

Problrm is probably mainly in the master. But I agree with John. Brakes is nothing to be cheap on. I think there's more crud in the system.

 

I thank you both very much. I don't tnow what it is but the master has 2 lines that tie into it one from each chamber, the brake warning connection is in the center. If its just a 4 way, I'll take it apart and replace the lines and the master while I'm at it. Disc's are OK but I don't think I'd ever need them, I did upgrade to shoulder straps, I don't speed or tailgate and with this big solid frame, I don't think I need to worry about much except the big trucks.

 

Howdy:
bout a month ago i bought a '69 f250 4speed with the 360. since i picked it up i have been having brake problems. best way i can explain it is that when i push the brake pedal it goes to the floor (then when i push even harder, i slow down to a point where the brakes lock up). this will happen when i gently push the brake pedal. when i absolutely slam on the brake pedal (and even pump it hard), i have decent pressure and i can come to a moderate stop.
yes, the brake fluid is topped off and i haven't seen any fluid leaks.
i have only been drivin a couple'a years so i don't have a whole lotta knowledge, expecially on vehicles as old as my truck. does anyone have an explanation on this or have had a similar problem?
Thanks much!
FordBoy4

 

[quote=FordBoy4;13398310]Howdy:
bout a month ago i bought a '69 f250 4speed with the 360. since i picked it up i have been having brake problems. best way i can explain it is that when i push the brake pedal it goes to the floor (then when i push even harder, i slow down to a point where the brakes lock up). this will happen when i gently push the brake pedal. when i absolutely slam on the brake pedal (and even pump it hard), i have decent pressure and i can come to a moderate stop.
yes, the brake fluid is topped off and i haven't seen any fluid leaks.
i have only been drivin a couple'a years so i don't have a whole lotta knowledge, expecially on vehicles as old as my truck. does anyone have an explanation on this or have had a similar problem?
Thanks much!
also, im new to this website so if i haven't posted in the right spot you'll have to excuse me.

 

FordBoy4 Welcome to FTE & the Bumpside Forum.

Normally we want a new issue in a thread of it's own. While you have a brake issue as well, you have a F250 and the OP has a F100. There can be similar answers but your truck could have power disc brakes, and the F100 not.

I say you have master cylinder issues without more info that needs to be addressed, usually with replacement.


John

 

All 1967 and later FoMoCo vehicles with dual master cylinders came with a Brake Pressure Differential Valve (BPDV) that some people mistakenly call a proportioning valve.

C8TZ-2B257-B .. BPDV = 1968/72 F100/250 2WD & F350 with drum brakes.

Here's a pic of the little charmer. Sorry, haven't been able to figure out how flip pics yet, but you won't get neck strain-look along the right edge, till you see 2B257.

The BPDV's used in 1967 are 1967 only as is the low brake fluid warning lamp switch that threads into the valve.

C8AZ-2B264-A .. Plastic Low Brake Fluid Warning Lamp Switch / Available from Ford/autoparts stores.

1968/79 F100/350 & Bronco / 1969/79 Econoline / 1968/69 FoMoCo Passenger Cars.

The little charmer is a notorious POS, develops cracks in its threads causing brake fluid to seep out. When this occurs, the low brake warning lamp on the dash comes on...and stays on!

 

Thanks ND, I found a little more info on the BPVD this morning. The dual master cylinder acts as a proportioning valve in that it has seperate chambers and brake lines for the front and rear brakes all the BPVD does is actuate the light if there is different pressures in the two systems. The easiest way to fix it since there are none available is to eliminate the valve, install a tee for the front system since it is fed from 2 lines, couple the rear to the line from the master clinnder and take the bulb out of the light.

 

I can not remember the web site, but I found the BPDV and repair kits that would work for my '67 F350 and other years. If I can find it again I'll put a link here. The repair kit was under $10.

I think I found what you need for the BPDV repair.

https://www.musclecarresearch.com/va...ner-drum-67-69