Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-16-2017, 03:38 PM   #1
rustythumb
Senior Member
 
Join Date: Jun 2010
Location: orange co. ca.
Posts: 155
Default question for brake gurus

help! car- '36. brakes- '46-'48 w/ '39 pedals. brakes gradually lock up when they get hot after 20 minutes of driving. normal when they cool down. i have since replaced master,wheel cylinders,shoes,springs & hoses & problem is the same!any ideas? thanks! p.s.- brake lines are new & not near exhaust.
rustythumb is offline   Reply With Quote
Old 10-16-2017, 04:54 PM   #2
V8COOPMAN
Senior Member
 
V8COOPMAN's Avatar
 
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 7,064
Default Re: question for brake gurus

Make sure that there is about 1/16" freeplay between the pedal's pushrod and the piston on the M/C. The piston absolutely MUST return completely to allow fluid pressure to return to effectively ZERO after each application. Make sure the return spring is returning the pedal all the way, also. DD
__________________
T5 W/TORQUE TUBE


In that final nano-second while the metal bar speeds toward his furry little head, the oblivious mouse FINALLY realizes WHY the cheese was free!





V8COOPMAN is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-16-2017, 04:55 PM   #3
1931 flamingo
Senior Member
 
1931 flamingo's Avatar
 
Join Date: May 2010
Location: new britain,ct 06052
Posts: 8,666
Default Re: question for brake gurus

Ck your M/Cyl rod for being too tight to the piston, keeping some pressure on the brakes.
Paul in CT

V8COOPMAN: Great minds think alike...................
1931 flamingo is offline   Reply With Quote
Old 10-16-2017, 04:59 PM   #4
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 893
Default Re: question for brake gurus

In addition to the master cylinder checks, old rubber brake line hoses can prevent free flow.
glennpm is offline   Reply With Quote
Old 10-16-2017, 05:22 PM   #5
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 2,337
Default Re: question for brake gurus

adjust your brakes when warm, otherwise they can be set up too tight
alanwoodieman is offline   Reply With Quote
Old 10-16-2017, 05:34 PM   #6
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 11,825
Default Re: question for brake gurus

There is a little return port in the bottom of the master cylinder reservoir that can get crud in it. A person may have to draw the fluid out of the reservoir to see if it is clear or not. Sometimes even with new components a little piece of rubber can get in there while fluid is returning.
rotorwrench is offline   Reply With Quote
Old 10-17-2017, 04:31 PM   #7
Bruce Lancaster
Senior Member
 
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
Default Re: question for brake gurus

I think this is well covered here...but I'd add in some more on the pedal itself.
1. return spring should return pedal to top very positively.
2. Bushings...worn out bushings and shaft can produce very eccentric pedal movement and the possibility of pedal stopping at positions other than actual top!
3. Study pedal movement from beneath car, watching as someone uses it smoothly, stomps on it hard, lets it pop up, etc.
4. Around the pedal...a flap of rubber mat or carpet around the hole can do bad things. In other words, once the free play and return are adjusted, be certain that the pedal has actually read the plan and followed along!
Bruce Lancaster is offline   Reply With Quote
Old 10-17-2017, 07:32 PM   #8
FlatheadTed
Senior Member
 
FlatheadTed's Avatar
 
Join Date: May 2010
Location: Auckland
Posts: 4,262
Send a message via AIM to FlatheadTed
Default Re: question for brake gurus

Yes at least 1/8 free play before pedal contact on the MC piston ,
__________________
http://www.flatheadted.com
FlatheadTed is offline   Reply With Quote
Old 11-01-2017, 08:00 PM   #9
rustythumb
Senior Member
 
Join Date: Jun 2010
Location: orange co. ca.
Posts: 155
Default Re: question for brake gurus

found the problem! thanks to everyone for suggestions, especially bruce lancaster! when i rebuilt the brakes,i added the thick rubber pads on the pedals, [it didn't have them before]. because of that,the pedal was not returning all the way! adjusting the rod to master cylinder had no effect. this has been driving me nuts for weeks! after i cut the pad off all is good. thanks again!
rustythumb is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 01:26 AM.