REAR BRAKE SHOES

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jimtylee
Posts: 30
Joined: Tue Aug 26, 2014 2:52 pm

REAR BRAKE SHOES

#1 Post by jimtylee » Wed Nov 02, 2016 4:36 pm

Hello
Have noticed when replacing the rear shoes on my FORD ESCORT MK2 1979 that it is always only the one shoe on either side that is worn much more than the other shoe...is this because it a leading shoe.....???? have others noticed this on their vehicle ???
thanks Jim

Tigdlo
Posts: 21
Joined: Thu Nov 19, 2015 9:29 pm
Location: Royston, Herts

Re: REAR BRAKE SHOES

#2 Post by Tigdlo » Wed Nov 02, 2016 6:39 pm

You are spot on regarding the leading shoe linings wearing quicker. This is because the drum rotation creates a 'servo' action on these shoes, which isn't present on the trailing shoes.
Worth mentioning, it is important that the rear wheel cylinders on these cars are able to float, or slide, on the backplates. If they are seized, only the leading shoes will be working anyway!

jimtylee
Posts: 30
Joined: Tue Aug 26, 2014 2:52 pm

Re: REAR BRAKE SHOES

#3 Post by jimtylee » Wed Nov 02, 2016 6:48 pm

Thank you for replying to me.....as the other shoe looks almost new i did replace the leading shoe only this time
Jim

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JPB
Posts: 10319
Joined: Fri Jan 07, 2011 3:24 pm

#4 Post by JPB » Wed Nov 02, 2016 6:49 pm

It's most likely to be caused by either a sticking cylinder slide in the case of the earlier type backplates which use single ended sliding cylinders, or a sticking piston in the case of cars where two pistons are present and cylinders are fixed to the backplate.

A late MK2 should have twin pistons at each wheel cylinder, but the fact that you mention that this affects both sides would tend to suggest sliding cylinders stuck at the end of their travel. Could it be that you have earlier parts? It's not unheard of for a piston at either side to stick but that happens mostly if the car isn't used often and is left standing with the parking brake on.
Tigdlo wrote:You are spot on regarding the leading shoe linings wearing quicker. This is because the drum rotation creates a 'servo' action on these shoes, which isn't present on the trailing shoes....
Centripetal force acts on both shoes equally so both are subject to "self-servoing" action in use. Leading shoes ought to wear at the same rate as trailing shoes..
;)
J
"Home is where you park it", so the saying goes. That may yet come true.. :oops:

Tigdlo
Posts: 21
Joined: Thu Nov 19, 2015 9:29 pm
Location: Royston, Herts

Re: REAR BRAKE SHOES

#5 Post by Tigdlo » Wed Nov 02, 2016 8:38 pm

I'm surprised at that John, makes you wonder why they bothered with twin leading shoe brakes?

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