I had Apple Hydraulics fully rebuild and resleeve the correct master cylinder for my 64 (with power brakes). I'm finally getting around to installing it today. The incorrect one that I took off worked fine. When I installed the rebuilt one, the rod from the power unit isn't nearly long enough to engage the m/c. Looking at both units where the push rod enters the m/c, the piston on the rebuilt correct one is a full inch recessed into the m/c, held by a clip. On the old one, the plunger comes all the way to the end of the cylinder. The bottom line is the rod coming out of the power brake unit is an inch too short. I tried to adjust it by unscrewing but it just spin. Do I need a rod extention (hold the jokes) or can the m/c clip be moved back to the end of the cylinder? Help!
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Re: Your lucky day I have one at home
Hello Doc,
Thanks for your very thorough response. My booster unit does in fact have the long push rod. I went out and measured it and it is the 1 1/4 or so inch length beyond the depression. If you look at the scan below, you can see my problem a bit more clearer. The one on the right is the service replacement I removed and the one on the left is the correct one rebuilt by Apple. It's hard to see but there is a groove for a retaining clip at the end of the sleeve. Your comment re the solid piston has me thinking that might be the problem. Or can I change the location of the piston by using moving the retaining clip to the end of the sleeve? It almost seems like I would have to to get full hydraulic flow. Any input appreciated.
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Not My Lucky Day
I think you've hit the nail on the head. I don't know how that retaining ring could have moved forward unless it wasn't properly seated to begin with. It does have to little round loops that hopefully will make it a bit easier to get out. If its a problem, I'll send it back to the rebuilder before I do more harm than good. Thanks for your help. It's very much appreciated. DavidComment
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I Surely Will !
I'm sure you've hit the nail on the head in diagnosing how this could have occurred. Those two little lobes on the lock ring aren't so little and I can fully undertand how they could be moved. I will take the lock ring from the master cylinder I removed and use it on the rebuilt one.
It was pretty easy to get the lobed ring out. I just hope it didn't score the sleeve when it was pushed in by the power unit.
Thanks for your infinite wisdom on this one, Doc. You've helped tremendously and by advising to nix the lobed ring, likely saved me a big headache down the road. /DavidComment
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Who said a picture is worth a 1000 words? *NM*
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You are very welcome *NM*
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