[font size="1" color="#FF0000"]LAST EDITED ON 02-Jul-01 AT 09:08 PM (EST)[/font][p][font size="1" color="#FF0000"]LAST EDITED ON 02-Jul-01 AT 09:07 PM (EST)[/font]

I just read in a post that when converting to dual reservior master cyclinder on 66 F100 you do not use a proportioning valve, is this true? I installed one off a doner but it must have been off a disc brake vehicle and my rear shoes went to nothing in 12,000 miles and my fronts shoes are still like NEW!!!The master is 67 mustang,Maybe the rear reservior should supply front brakes? anticapated a problem so took one (A proportioning valve?) off a 67 bronco that was all drums. But is this a proportioning valve or is it just a "distrubution block" to send fluid to all wheels evenly???Thanks Fatz
" Ever since I have been prescribed Viagra I have a side effect of seeing BLUE OVALS"

 

You shouldn't use one because it will permit a greater volume of fluid to go to one side of the valve. You also must use a m/c intended for a drum system or you get a similar result.
Eric

 

Marc, I think the recommendations from this forum, have been to swap the donor disc, prop valve, mc, booster, line setup, all together.

My first thought is that if you were using shoes for a non powered brake system, with power, a lot more pressure is being applied and is wearing the shoes out faster.

John

jowilker
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66F100s Rule
In the cool still quiet of night you can hear chevies rusting away.

 

[font size="1" color="#FF0000"]LAST EDITED ON 03-Jul-01 AT 10:46 AM (EST)[/font][p][FONT COLOR="#0000ff" SIZE="3" FACE="Veranda"]
The "distribution" block you refer to from the Bronco (drums on all 4) is technically not that at all although it does make a convenient place to split the lines. The item is actually called a Pressure Differential Valve. The valves function is to serve as a warning in the case of a major failure in either the front or the rear system. What it does is sense a pressure loss and turn a warning light on. The front and rear systems remain isolated at all times. If your truck has drum brakes on all 4's then the use of the item in question is not the problem. The brake system would actually work without the pressure differential valve.

A proportioning valve is used strictly where there are disc brakes involved. The valve allow different rates of pressure to be applied to the front vs the rear.

I do agree with JOWILKER that you should have swapped all parts over. Adding a power booster shouldn't cause any problem assuming you have the correct master cylinder. There are different ones for the power/drum and non-power/drum trucks. If I were you, I'd stick to a master cylinder designed for the trucks and not go with the mustang one. I suspect the bore size is different which could have a negative effect on braking power.

Your brake problem could be as simple as the self-adjusters not functioning correctly on the fronts. 12,000 miles on a set of rear brakes is probably too little, but on the other hand, were you doing one too many power slides with it?? :-)
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p.s. How is Route 20? I feel the need to take my 66 out on a road trip east. :-)

 

Thank you all, I will use the bronco parts as i have 4 drum non power brakesand no booster! Stock man route 20 is beautiful come on down and we can talk trucks any time, Where are you? Fatz

 

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Fatz:

I'm in the Den on my computer. :-) Actually, I am a stone's throw. I'll give you a shout off-line soon.
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Stockman get me at Fatzncompany(No Email Addresses In Posts!)

 

Marc, Thom aint gonna devulge his location you see. He lives just off this nice lake and he is scard you might come and catch all of his fish.

John

jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page

[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group

66F100s Rule
In the cool still quiet of night you can hear chevies rusting away.

 

Hey John I too Have the BIG Lake so you all are welcome to come a fishing, But BEWARE lots of those ice fishing guys drive CH***'s and left them on the ice a little too long so I am sure you will catch alot of throw backs, Fatz

 

 

fatz;
After re-reading these posts, I think you are still going to wearing out your rear brake shoes much too fast. Either your parking brake cable is set too tight or doesn't return. Or the return springs on the shoes are old and/or weak. Replacing the master cylinder is not going to fix your problem.
First off, the rear (next to the firewall) reservoir is the primary as is hooked to the front brakes. 67 and 68 Mustangs used separate proportioning valves for disc brake cars but that restricts high brake pressure to the rear (drum) brakes only. The only difference between disc/drum and drum/drum master cylinders is 1) size of the individual reservoirs and 2)residual valves in the exit ports to the brake lines. Disc/drum m.c. only have the residual valve to the rear drum brakes; drum/drum have the residual valve to both sets of brakes. Why? Because disc brakes don't have a return spring and can't have the residual pressure against the pads or they will wear out very quickly.
Since you are non-power drums all the way around, a Mustang m.c. for drum brakes obviously has been working fine for you. Work on those rear drums and go for a new set of springs when you replace the shoes. And check/adjust that parking brake cable.
I also completely disagree with using junkyard master cylinders. At a minimum, get a rebuilt unit. Better yet, get a new one. This is money well spent.

Lee
1965 F100 short box styleside

 

[font size="1" color="#FF0000"]LAST EDITED ON 11-Jul-01 AT 11:03 AM (EST)[/font][p]Thanks Lee , Great advise and explained well. it ended up being axel bearing making drum **** and lock. changed master any way back to new orignal style single reservior and have great brakes also used shoes with all primary linings as opposed to the ones with a short side