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Convert to power brakes? |
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11542 |
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Posted: Jun/12/2011 at 9:09pm |
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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fmahannah
AMC Addicted Joined: Nov/20/2010 Location: Dahlonega, GA Status: Offline Points: 520 |
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I will have to check the pedal ... the way some other parts on this car were messed up it would not surprise me that it is connected wrong. Pedal is way high in the car, have to raise foot way up to get it on the pedal.
Firewall below master cylinder is missing paint so I know they had trouble since the last repaint, hard to tell what they did to it. |
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74 Javelin AKA Ghost
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Fluffy73
AMC Addicted Joined: Nov/21/2007 Location: Castlegar, BC Status: Offline Points: 3059 |
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My old '74 Javelin had manual discs and it took twice as much pedal effort to stop than my Gremlin with manual drums. It's the nature of manual discs. Drums are easier because you're only forcing fluid into a small wheel cylinder (like 13/16" diameter). But on a manual disc car, you've got to force fluid into the calipers' chamber which is 2 to 3 times larger than a wheel cylinder.
Either that, or you've got a pedal with two holes for the pushrod to connect to and somebody put it on the wrong hole. Most cars I've seen have a pedal (and arm) that have provisions for manual or power brakes.
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I am genetically incapable of being Politically Correct.
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Midnight Rambler
AMC Addicted Joined: Jan/17/2011 Location: SoCT Status: Offline Points: 1670 |
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Is there a brake pedal difference like on some of the Ramblers?
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'66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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Sounds like a bad master or unflushed fluid with some moisture in it to me. Manual discs should be firm but not rock hard and should stop every bit the same as power brakes albeit with increased pedal pressure
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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If you are going for a cam that may not work with the power set up then I would get what you have checked out and stick with it.
Dave ----
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11542 |
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Manual brakes can be working fine and still require a good bit of pedal pressure. Most of us drivers today are only used to power brakes and so part of it may be perception. Getting your system checked out is a good start. Then you can decide what you're comfortable with.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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fmahannah
AMC Addicted Joined: Nov/20/2010 Location: Dahlonega, GA Status: Offline Points: 520 |
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Thanks. I am going to take it to a regular brake shop first to make sure everything is working the way it should. It's possible the pedal is hard and braking is bad because there is something wrong. I replaced the rear cylinders because they were leaking and bled everything, but it just does not seem to stop like it should.
Also, if I put the cam in that I want I might not have enough vacuum for power brakes without getting a vacuum reserve tank or whatever you call it. |
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74 Javelin AKA Ghost
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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Not hard at all. Some bracketsand a couple of other odds and ends like of course the booster and power master cylinder that you can buy as a complete kit from most part supply houses plus some different upper pedal brackets and master cylinder adjustment stud but that should come already installed with the PB/MC kit. If you can find a donor car in a bone yard it should have everything you need. Also, post right here in the wanted section. Sometimes folks prefer manual and pull the PB stuff off their cars.
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11542 |
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It's certainly possible. The ideal switch would be to get the bracket/booster/rod to the brake pedal assembly you need from a donor car, and add a new power disc brake master cylinder to that. You'll need to redo the lines to the master as well. Then a line to manifold vacuum and you should be in business.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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