The Ford Barn

mll1446 · 09-23-2017, 03:03 PM

i have replaced brake shoes , drums have been cut, replaced master cylinder and junction block and wheel cylinders when i have car up on all four wheels spins and brakes work fine
however when i drive it rear brakes are hot and seem to drag ? any suggestions on problem and or fix

DD931 · 09-23-2017, 03:39 PM

Be sure that there is play in the master cylinder rod to insure that the piston comes all the way back to allow return of fluid from wheel cylinders. You may still have pressure on the rears even when your foot is off the pedal.

Karl Wolf · 09-23-2017, 05:37 PM

How are the return springs on the brake cables?
They are on the inside, pull the drums to get to them.
You may be able to assess their condition by pulling on one at a time,
right at the cable entry to the drum. (It may help to back off the adjusters)
This could be the cause of dragging brakes.

Karl

5851a · 09-23-2017, 05:44 PM

When younger I would just replace the brake shoes, now I look at all of the friction points on the backing plates making sure there are no grooves worn in them and lube them with Brake Lube. I also get the new return springs that I didn't used to think were important.

mll1446 · 09-23-2017, 08:14 PM

Would axle or differential have any effect on the heating up and braces locking up?

mll1446 · 09-23-2017, 08:36 PM

Sponsored Links (Register now to hide all advertisements)

Would axle or differential have any effect on the heating up and braces locking up?

5851a · 10-01-2017, 07:52 AM

Have you replaced the brake hoses? They can deteriorate internally and turn into one way check valves that will hold the brakes on.

09-23-2017, 03:03 PM	#1
mll1446 Senior Member Join Date: May 2010 Location: Palatine il Posts: 320	1947 mercury brake question i have replaced brake shoes , drums have been cut, replaced master cylinder and junction block and wheel cylinders when i have car up on all four wheels spins and brakes work fine however when i drive it rear brakes are hot and seem to drag ? any suggestions on problem and or fix

09-23-2017, 03:39 PM	#2
DD931 Senior Member Join Date: May 2010 Location: PA Poconos Posts: 723	Re: 1947 mercury brake question Be sure that there is play in the master cylinder rod to insure that the piston comes all the way back to allow return of fluid from wheel cylinders. You may still have pressure on the rears even when your foot is off the pedal.

09-23-2017, 05:37 PM	#3
Karl Wolf Senior Member Join Date: May 2010 Location: Mill Valley,Ca. Posts: 1,509	Re: 1947 mercury brake question How are the return springs on the brake cables? They are on the inside, pull the drums to get to them. You may be able to assess their condition by pulling on one at a time, right at the cable entry to the drum. (It may help to back off the adjusters) This could be the cause of dragging brakes. Karl

09-23-2017, 05:44 PM	#4
5851a Senior Member Join Date: Oct 2014 Location: NE Iowa Posts: 1,664	Re: 1947 mercury brake question When younger I would just replace the brake shoes, now I look at all of the friction points on the backing plates making sure there are no grooves worn in them and lube them with Brake Lube. I also get the new return springs that I didn't used to think were important.

09-23-2017, 08:14 PM	#5
mll1446 Senior Member Join Date: May 2010 Location: Palatine il Posts: 320	Re: 1947 mercury brake question Would axle or differential have any effect on the heating up and braces locking up?

09-23-2017, 08:36 PM	#6
mll1446 Senior Member Join Date: May 2010 Location: Palatine il Posts: 320	Re: 1947 mercury brake question Sponsored Links (Register now to hide all advertisements) Would axle or differential have any effect on the heating up and braces locking up?

10-01-2017, 07:52 AM	#7
5851a Senior Member Join Date: Oct 2014 Location: NE Iowa Posts: 1,664	Re: 1947 mercury brake question Have you replaced the brake hoses? They can deteriorate internally and turn into one way check valves that will hold the brakes on.