Question
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Followup To - Howard,
I think I got too long winded in my first question. My ultimate question peertains to the rod between the primary and the secondary piston. Should that rod "float" in the primary or is it pinned also?
Thanks
Keith
Question -
My son has a 1973 Midget. The brakes are the only things that needed attention when he bought it. He has purchased a repair kit for the master cylinder. In looking at the repair manual, it shows 2 pistons. The primary and the secondary, with a rod in between. Does this rod "float" in the primary piston? Is that what the spring is supposed to do? The manual only seems to call out for 1 split pin to hold everything together. Is that correct?
Thanks for all your help.
Keith
Answer -
Hi Keith,
The two piston unit you are referring to is held together with a pin. If your kit just came with the seals then you will need to remove that pin by pulling the spring and the small metal cup back to expose the pin so it can be removed. Then you will have access to remove the seal off of the forward piston. If you did not get a good picture of which way each seal faces, make note of how the old ones face and write it down. The function of the center spring is to keep tension on the separation of the two pistons.
If you need help building it let me know and I will go into more detail.
Howard
AnswerThe rod between the two pistons looks like a cotter pin and secures the two pistons together with a spring between the two pistons. The method the cotter pin is held to the rear piston is with a small straight pin which is held in plsce and not in view. It is under the spring retaining cup on the end toward the rear piston. If that is not clear I can e-mail you a picture from the factory service manual which shows the structure. Let me know if you need it.
The pin between the two pistons is pined so the two pistons can not separate.
Howard (longez8@bellsouth.net)
