Sealing ring in the bottom of the master cylinder?

Post Reply
Tennmogger
Posts: 56
Joined: Sun Apr 28, 2013 2:02 am

Sealing ring in the bottom of the master cylinder?

Post by Tennmogger »

Working on the brakes on the Haflinger. The master cylinder was removed and after much manipulation got the piston free and out. It's surprising how parts can get so stuck when not used for years.

The last part to be removed from inside the cylinder was the spring. However, at the inner end of the spring (the spring end capped by a metal cup) there is a seal or quad ring. This ring was diagonally around the metal cup on the end of the spring. How is that ring supposed to be installed? Does it go co-planar around the metal cup on the end of the spring? Does it simply slide into the bottom of the cylinder to give something soft for the spring to hit? Does it keep the cap of the spring from plugging the fluid outlet? Is the quad ring even supposed to be there?

I'm taking pictures and will post when available.

Thanks,

Bob
1952 Willys M-38, Unimogs from 1957, 1965, 1970, 1975, 1978, 1988, and a 1968 Haflinger NA bugeye!
Tennmogger
Posts: 56
Joined: Sun Apr 28, 2013 2:02 am

Re: Sealing ring in the bottom of the master cylinder?

Post by Tennmogger »

Here's how it was as disassembled:
002.JPG
002.JPG (197.87 KiB) Viewed 850 times
But, it's becoming obvious to me that the spring was in backwards. It should have been assembled like this:
003.JPG
003.JPG (193.3 KiB) Viewed 850 times
But that still leaves the question of where the quad ring should be?
004.JPG
004.JPG (187.15 KiB) Viewed 850 times
Bob
1952 Willys M-38, Unimogs from 1957, 1965, 1970, 1975, 1978, 1988, and a 1968 Haflinger NA bugeye!
User avatar
heinkeljb
Posts: 2754
Joined: Sun Dec 30, 2012 12:49 pm
Location: Lewes, East Sussex - UK

Re: Sealing ring in the bottom of the master cylinder?

Post by heinkeljb »

Bob,

Did you ever get this sorted? I believe it should be at the bottom / end of the cylinder in order to provide a cushion between the spring and metal of the cylinder. It does not need to provide a fluid seal at that end as there is no hole other than the pipe you want the fluid to go down at that end.
I can't think of a reason for it to be up the other end as it would block the little holes in the end of the piston.

John
Haflinger 703AP LWB 1973 - (Once owned by Lady Sutherland & Sons.) Now called "Lurch" !

Have you hit the "DONATE" button at the bottom of the page after reading this post? Many thanks if you have!!
Post Reply