Rolling Resistance As My Gal Heats Up - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 20 (permalink) Old 07-31-2019, 08:40 PM
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Re: Rolling Resistance As My Gal Heats Up

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Originally Posted by moose2009 View Post
The brake fluid will not, or at least should not heat up on it's own. There is an initial locking, sticking, dragging condition that has to generate heat in the components. Even if it's something like the booster bad internally causing it to hold pressure when it shouldn't ( I have seen it happen on another aftermarket disk brake conversion) and dragging the brakes.

Maybe the lines being too close to the headers is causing it, if that were true, running it for a little bit on stands would yield some results. In over 20 years of automotive experience, more than a decade professionally, through all the manufacturers trainings I have been certified in, including brakes, no one ever told me that there is always "xyz" fix for "abc" problem. I'm not saying I know everything, or that I've seen everything, because I dont and I haven't. All I'm saying is having all the information possible, and doing as much diagnosis as possible, will yield the best results 99% of the time.

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correct.. brake fluid will not heat up on its own...
but driving in traffic or short stop and go conditions for example..
calipers start to warm up.. as warming up ,fluid starts to expand some..
thats normal and excess flows back into bowl when releasing brake..


just getting buy headers alone will not cause dragging brakes, since expanding fluids can still flow back into bowl..and pistons retract..
blocked lines..deteriorating old lines etc..miss adjusted booster rod and so on...causing blockage etc..
with fluids having no where to go.. the more the brakes drag the hotter fluid in caliper get and expand..the tighter the brakes apply/drag....


being a disc brake conversion , a lot is pointing to booster and master cylinder... miss adjustment/miss match..
some troubleshooting and fixes should get him back on the road again..
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%201964%20Galaxie/?action=view&current=09-03-10_1408.jpg Lars...
64 galaxie 500 2dr fastback...390 4v, Bendtsen adapter, maddog's stage3 700R4 trans,3.70 Posi..far from perfect but getting there...

Last edited by RAGGAREN; 08-01-2019 at 07:39 PM.
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post #17 of 20 (permalink) Old 08-01-2019, 07:11 PM
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Re: Rolling Resistance As My Gal Heats Up

I ran into a similar issue when I converted my '64's brakes a few yrs back --needed just a smidge less pushrod length, so I removed the brake pedal's return bumper, rigged up an adjustable one to try and get that last bit of length, and with that now there......I was able to come off of the stud part of my new bumper with a small bracket to then mount a universal type electric b/l switch further back on the brake pedal. To keep the switch's button firmly 'off' when the brakes weren't being applied, I then added a long but light return spring.

All of that has been down there for a few seasons now --but Lars I do love your spring idea !!

IMG_20190801_204202272 by 1964 Galaxie 500, on Flickr

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Originally Posted by RAGGAREN View Post
i had a extra pedal assembly for my 57 chevy..
i scavenge the spring from that...
i was a sob to install on the galaxie pedal ...
but works great.....


Norm
1964 Gal 500, 390, 4spd, Magnum 500s
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post #18 of 20 (permalink) Old 08-04-2019, 05:43 PM Thread Starter
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Re: Rolling Resistance As My Gal Heats Up

Update ------ Saturday morning arriving at my great mechanic David's lift bay, as I pulled in, my car did not want to roll. We immediately loosened the master cylinder from the power booster and as soon as we pulled the master cylinder away the pressure was relieved at the brakes and the car could roll by hand. We looked at the adjustment on the PB rod and it was shortened already to the max. As we tried to mate the two units back together you could feel a resistance at roughly 1/8 inch from flush fitment. So we started by putting a thick washer on both studs and retightened the MC onto the booster. Test drove, had a touch more brake pedal travel, braking was good, and the brake seemed to bind less but did still bind. We then put a second washer on and test drove. During third test drive I braked hard numerous times, caught signals, and drove quite a ways and thought the issue was solved until I pulled back into the bay and felt a very slight drag. But this time we let the car sit a bit and it then rolled freely.

Decided for now to leave the spacing were it was (.20 inch) and look at some other issues. As I've said my brake lines ran really close to my 406's shorty headers. Took the cap off master cylinder and the fluid smelled burnt. Thinking it may be Dot 3 we drained it all and refilled the whole system with new Dot 4. During this process we slipped high temp brake/fuel line sleeves on brake line areas closest to headers. While up on the lift the brakes were checked and all looked good.

So I left David's shop wanting to put some miles on it. Took my daughter and granddaughter on a ride. Everything seemed just fine, no dragging at stops. Pulled into my home shop and it felt just slightly dragging again?????? Waited a bit and I could push it freely. So its really close now. If I had a paper thin washer to add I would have tried it. As soon as I'm sure its all right on, my best friend (machinist rod owner} will make a custom full spacer to replace the washers.
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post #19 of 20 (permalink) Old 08-04-2019, 06:39 PM
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Re: Rolling Resistance As My Gal Heats Up

right on Willy...
noting like the smell of success....

%201964%20Galaxie/?action=view&current=09-03-10_1408.jpg Lars...
64 galaxie 500 2dr fastback...390 4v, Bendtsen adapter, maddog's stage3 700R4 trans,3.70 Posi..far from perfect but getting there...
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post #20 of 20 (permalink) Old 08-06-2019, 08:38 PM Thread Starter
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Re: Rolling Resistance As My Gal Heats Up

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right on Willy...
noting like the smell of success....
Raggaren ---- Thanks to all the help from you and the others here I was able to get it dialed in real close. That video you posted was great. If I can find a paper thin washer I may add it. Below is a picture where you can see the two spacing washers.
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