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Username Post: Where does Brake Fluid go?        (Topic#351125)
Jack Crain 
Contributor
Posts: 850

Loc: Wichita Falls, Texas
Reg: 07-24-11
05-16-18 05:20 AM - Post#2734082    

Some time back I did the disk brake mod an my 46 Fleetmaster. Since then, approximately 4 times, I discovered that when I push the brake pedal, it goes to the floor. When I check the master calendar, the reservoir for the disk side is totally empty. So, I fill it up, bleed the brakes, look for leaks, and go off on my merry way. Each time I have NEVER found any leaks or even evidence of a leak. Over the weekend, after refilling and bleeding the system, I took it out for a spin and made sure I used the brakes very often. After about 50 miles, and a hundred brake applications, I crawled underneath to look for leaks. Every millimeter of the brake system was bone dry. Nothing, Nada. The reservoir was right where I left it when I filled it.So, I parked it and came back into town, scratched my head and had a cool drink to think this one out. I can't come up with anything.
Help!

1946 Fleetmaster 4-dr Sedan with '57 235
Fenton Dual Exhaust and Intake
Dual Carter Webbers 2 barrel Carbs
HEI ignition
Front Disk Brake
T-5 Tranny


 
lofat46 
2nd Year Silver Supporting Member
Posts: 229
lofat46
Loc: Bloomingdale, IL
Reg: 08-12-13
05-16-18 06:43 AM - Post#2734089    
    In response to Jack Crain

I'm going to take a wild guess and say that a caliper piston seal is leaking slowly onto the rotor and the friction between the pads and rotor are evaporating the fluid. Leaking just enough while driving to lower the fluid level but not enough to be visible while stationary.

1946 Chevy Fleetmaster 4-door Street Rod



 
Jack Crain 
Contributor
Posts: 850

Loc: Wichita Falls, Texas
Reg: 07-24-11
05-16-18 07:21 AM - Post#2734097    
    In response to lofat46

That makes sense. Next time I am at the car, I'll pull the calipers and see if I can find anything.
Thanks

1946 Fleetmaster 4-dr Sedan with '57 235
Fenton Dual Exhaust and Intake
Dual Carter Webbers 2 barrel Carbs
HEI ignition
Front Disk Brake
T-5 Tranny


 
Shepherd 
Frequent Contributor
Posts: 1262

Loc: Lake George, NY
Reg: 11-11-15
05-16-18 01:46 PM - Post#2734114    
    In response to Jack Crain

Or into the booster if so equipped.



 
Jack Crain 
Contributor
Posts: 850

Loc: Wichita Falls, Texas
Reg: 07-24-11
05-16-18 06:09 PM - Post#2734134    
    In response to Shepherd

They are manual, no booster

1946 Fleetmaster 4-dr Sedan with '57 235
Fenton Dual Exhaust and Intake
Dual Carter Webbers 2 barrel Carbs
HEI ignition
Front Disk Brake
T-5 Tranny


 
55MAS 
Senior Member
Posts: 1469

Loc: North Coast, Ohio
Reg: 12-19-01
05-19-18 03:44 PM - Post#2734366    
    In response to Jack Crain

  • Jack Crain Said:
They are manual, no booster



Your initial post states "reservoir", implying a single reservoir, instead of a dual reservoir with different sized reservoirs, for drum and disc. What kind of master cylinder you you have?



 
Keith_Knox 
Moderator and "16th Year" Gold Supporting Member
Posts: 5832
Keith_Knox
Age: 76
Loc: Napa, Ca USA
Reg: 04-02-00
05-19-18 07:19 PM - Post#2734380    
    In response to 55MAS

In Jack's write up in the sticky's, he says he used a dual master cylinder.

1948 Chevy Fleetmaster Coupe Purchased 6/2010. Stock with rebuilt 52 216 installed May 1966.
1946 Chevy 1/2 ton pickup, stock. Purchased 11/18/17.
1962 Ranchero Purchased 4/2017 221 V8 Automatic.
2013 F150 Crew Cab


 
55MAS 
Senior Member
Posts: 1469

Loc: North Coast, Ohio
Reg: 12-19-01
05-20-18 07:34 AM - Post#2734412    
    In response to Keith_Knox

ok - missed it.



 
Jack Crain 
Contributor
Posts: 850

Loc: Wichita Falls, Texas
Reg: 07-24-11
05-21-18 05:00 AM - Post#2734484    
    In response to 55MAS

When I check the master calendar, the reservoir for the disk side is totally empty.


If you re read the original post, I believe you will find the above statement in it.

Also, It was a 76 Mustang disk/drum master cylinder

Sorry but I used copy and paste instead of the quote box

1946 Fleetmaster 4-dr Sedan with '57 235
Fenton Dual Exhaust and Intake
Dual Carter Webbers 2 barrel Carbs
HEI ignition
Front Disk Brake
T-5 Tranny


 
RoadRocker 
"4th Year" Silver Supporting Member
Posts: 192
RoadRocker
Loc: Kentucky.
Reg: 12-13-13
05-21-18 05:21 AM - Post#2734486    
    In response to Jack Crain

Hey Jack, Same thing happened to me after 1 year?? Looked and could not find where it went? Filled disk side up bleed brakes, no leaks anywhere been 6 months now and all is well. Now I check my fluid often. I do not use brakes alot and have always said you only need them when you get there. Where did my fluid GO??
Tom

48 sports coupe
63 C-10 long fleet
17 Tacoma double cab longbed
17 Toyota Rav-4

Been down most all the roads nowhere left to go??


 
Jack Crain 
Contributor
Posts: 850

Loc: Wichita Falls, Texas
Reg: 07-24-11
05-21-18 07:37 AM - Post#2734498    
    In response to RoadRocker

Hey Tom, how you been?

I most definitely check my reservoir every time before I head out now. Don't need any surprises. All in all, I am glad I did the mod, as long as I keep the brake fluid topped off, a much better braking system.



1946 Fleetmaster 4-dr Sedan with '57 235
Fenton Dual Exhaust and Intake
Dual Carter Webbers 2 barrel Carbs
HEI ignition
Front Disk Brake
T-5 Tranny


Edited by Jack Crain on 05-21-18 02:25 PM. Reason for edit: No reason given.

 
RoadRocker 
"4th Year" Silver Supporting Member
Posts: 192
RoadRocker
Loc: Kentucky.
Reg: 12-13-13
05-21-18 03:28 PM - Post#2734529    
    In response to Jack Crain

Jack, I am doing well thanks. I did the disk mod for the dual master as i have lost all brakes in older vehicles with single masters, I lived for 35 years in western NY lots of salt rusty lines and dirt roads. I don't have a problem with drum brakes all around had to lock up the hucks once and they stopped great. Disks lock up quick on snow and ice turning to skies and you can't steer. I have had to pull release on GM cars and use park brake to slow and stop going down hill ! That or the ditch. I always set up drums to grab in the rear first much better handling for me. Happy motoring Jack enjoy your ride
Tom

48 sports coupe
63 C-10 long fleet
17 Tacoma double cab longbed
17 Toyota Rav-4

Been down most all the roads nowhere left to go??


 
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