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MG MGA - Rear brake adjustment

I was just browsing through Holdens and I noticed three very similar (pictures look identical) rear brake cylinders for MGA, Morris Minor and early Spridgets. I noticed that they were very different prices too, MGA highest of course.

The three part numbers are MGA GWC1111, Minor GWC1116 and Spridget GWC1114.

OK, now for my point. As they look the same I assume that they may all fit MGA? If so are they different lengths?
And if that is the case, could incorrect parts be fitted to the MGA making it difficult or impossible to adjust the rear brakes?

The reason I ask is that there have been several posts where people have not been able to adjust rear brakes and a shorter slave cylinder would be an obvious culprit, however, this has not been suggested before.

Anyone?
Neil McGurk

Neil

I am pretty certain they are the same and that I fitted a set.

Steve
Steve Gyles

Which are the same? I was pretty sure that the minor parts were the same as MGA, but why the different part numbers and higher cost?

http://www.holden.co.uk/displayproducts.asp?sg=2&pgCode=065&sgName=Hardware&pgName=Brakes+%26+Suspension&agCode=1444&agName=Brake+Wheel+Cylinders
Neil McGurk

"...there have been several posts where people have not been able to adjust rear brakes and a shorter slave cylinder would be an obvious culprit, however, this has not been suggested before."

The reason for running out of adjustment on the rear brakes is that the same "snail" adjuster is used both front and rear. Since the front brakes use twin leading shoes, each shoe gets its own adjuster, whereas the rear brakes use one adjuster to adjust both shoes. the result is that the rear shoes are moved only half the distance as the front shoes are for a given amount of turn on the adjuster and the rear brakes "run out of adjustment" long before the linings on the shoes are worn down. The fix for this situation is to get a second set of adjuster masks and tack weld a 1/8" shim to them and replace the unmodified masks with them when you run out of adjustment (save the unmodified masks to use when you do get the rear shoes relined). Cheers - Dave
David DuBois

This thread was discussed on 26/06/2009

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