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 07-08-2017, 01:18 AM   #1
49r
Senior Member
 
Join Date: Jul 2011
Location: Wellington New Zealand
Posts: 303
Default F1 front brake grabbing

In my '49 F1 6 years ago I fitted new wheel cylinders, master cylinder, brake lines and brake linings. Thereafter I replaced the brake fluid annually to avoid condensation issues (not using silicon fluid). New front drums were fitted 10 years ago.

Recently the front right brake suddenly began grabbing under heavy braking at speed, under light braking at walking pace speed, but with no grabbing at higher speeds with normal braking.

Adjustment checked, no leaking cylinders or oil on brake linings. I also checked for cracked drums, which had been my reason for fitting new drums after a cracked RH drum caused a violent grab - fortunately in my driveway.

I replaced both front brake cylinders and problem solved. I am surprised at the effect of what I assume was a sticky RH cylinder. The brake cylinders have 'USA' stamped on them, so assume were USA made.

Anyone experienced similar issues?
49r is offline   Reply With Quote
Old 07-08-2017, 07:46 AM   #2
Barry-ct
Senior Member
 
Barry-ct's Avatar
 
Join Date: May 2010
Location: Newington, Connecticut
Posts: 1,374
Default Re: F1 front brake grabbing

Are you getting a good flow of brake fluid from both sides when you bleed it? You don't mention new rubber brake lines in what you have replaced. They can collapse internally and look good on the outside. The left side could be bad and the right is doing the braking, causing a pull to the right. Also make sure both drums are adjusted equally.
__________________
Barry

50 F-1
Barry-ct is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-08-2017, 09:43 AM   #3
Ken Crans
Senior Member
 
Ken Crans's Avatar
 
Join Date: May 2010
Location: Highland,MI
Posts: 1,196
Default Re: F1 front brake grabbing

I have had same problem... Cups inside wheel cylinders were not traveling equally, therefore creating one to push harder then other causing wheel to lock up and pull.
Ken Crans is offline   Reply With Quote
Old 07-08-2017, 10:39 AM   #4
Ross F-1
Senior Member
 
Ross F-1's Avatar
 
Join Date: Nov 2010
Location: NM
Posts: 2,183
Default Re: F1 front brake grabbing

Have your backing plates got grooves worn on them where the edges of the shoes rest against them? I had such bad grooves that one or more shoes wouldn't sit straight, and wouldn't retract all the way. Welded them up and ground flat, no problems.
__________________
'52 F-1, EAB flathead
Ross F-1 is offline   Reply With Quote
Old 07-08-2017, 02:53 PM   #5
49r
Senior Member
 
Join Date: Jul 2011
Location: Wellington New Zealand
Posts: 303
Default Re: F1 front brake grabbing

Thank you for your comments.

Barry-ct: yes, a good flow when bleeding, and I should have mentioned that all brake hoses were replaced.

Ross F-1: No evidence of any wear in the backing plates caused by the brake shoes.
49r is offline   Reply With Quote
Old 07-08-2017, 03:07 PM   #6
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 394
Default Re: F1 front brake grabbing

If it pulls hard right while stepping on pedal and pulls left when you let up , your left rubber flex line or hard line is blocked .
Ggmac is offline   Reply With Quote
Old 07-08-2017, 03:34 PM   #7
flatford8
Senior Member
 
flatford8's Avatar
 
Join Date: Jan 2012
Location: Lyman,ME.
Posts: 1,289
Default Re: F1 front brake grabbing

Quote:
Originally Posted by Ggmac View Post
If it pulls hard right while stepping on pedal and pulls left when you let up , your left rubber flex line or hard line is blocked .
I've had problems with flex lines collapsing. The above suggestion is a good way to find the problem..... Mark
__________________
I'm thinkin' about crankin'
My ragged ol' truck up
and haulin' myself into town.
Billy Joe Shaver
flatford8 is offline   Reply With Quote
Old 07-09-2017, 11:51 PM   #8
fordor41
Senior Member
 
fordor41's Avatar
 
Join Date: Oct 2011
Location: elmira,ny
Posts: 779
Default Re: F1 front brake grabbing

if the problem is brake lines swap them around. problem should move to the other side.
fordor41 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 07:16 PM.