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Brake master push rod |
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redright9
AMC Apprentice Joined: Jun/23/2014 Location: Antelope Valley Status: Offline Points: 99 |
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Posted: Feb/19/2017 at 9:24pm |
Hello,
I have a '69 440 Rambler wagon. I am installing the Scarbird disc brake conversion and purchased the brake master cylinder they recommended (Raybestos MC36386). I removed my old one and the pushrod that attaches to the pedal seems about a half inch too short and the new master cylinder doesn't have the groove for the snap ring to install the pushrod. My car is originally a non power drum brake car. What pushrod do I need? Thanks |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19610 |
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You can get by without the snap ring to hold the rod in, it won't fall out unless the piston in the MC sticks in the fully depressed position and the pedal comes all the way back. Won't matter then -- you have no brakes regardless, and something drastic has gone wrong.
You might need to make a new pushrod. I've done it with a long 3/8" (I think that's the size) eye bolt years ago. If it's too long brakes will be real touchy and pedal travel short, too short and pedal will go down too far, and of course once it hits the floor you're done. You might want to try the original pushrod. The hole in the new MC may not be as deep as the original, but you can measure that. You can judge if it goes down too far without moving the car. If you do decide to move the car do it in as level a place as possible and make sure the park brake works. You just need to get the car moving -- pushing is fine, don't need to move fast at all. If travel seems good and brakes stop it from a slow roll it's time for a test drive. |
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Frank Swygert
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redright9
AMC Apprentice Joined: Jun/23/2014 Location: Antelope Valley Status: Offline Points: 99 |
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Thanks for your reply! I did measure and the hole in the new master is deeper than the old one. Looks like I'm going to have to make something..
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redright9
AMC Apprentice Joined: Jun/23/2014 Location: Antelope Valley Status: Offline Points: 99 |
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I tried remeasuring it and tried to be more accurate. Seems like it's about 0.250" difference ( deeper). I think I will try it and see how it acts. Thanks again.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19610 |
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I stuck a small nut down the hole in the MC once. Fixed it right up. That or a piece of steel rod, bolt, etc. .... something that won't compress or let the rod push by and wedge in. Once you get something the right length a little epoxy or RTV in there to hold it in place won't hurt.
The deep MC is usually for non-power brakes, helps retain the pushrod if there is a failure -- piston sticks all the way in. As noted, what good is retaining the rod then? I think the idea is you could pull the pedal back up and might be able to get a little more brake, but that takes too much time, and you have to think about it while you're in panic mode from having the pedal hit the floor and not ciome back up... |
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Frank Swygert
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