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AMX/Javelin Brake Booster Bracket |
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Dirtydog
AMC Apprentice Joined: Nov/20/2017 Location: Harleysville PA Status: Offline Points: 67 |
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On mine which is a 69 AMX there was about a half inch to three quarter inch spacer between the brake booster and the bracket which would change location of the pedal but if you'd like it where it's at that's fine I would think. And everything seems to work well. I'm still trying to get the pivot pin unseized I have to take it to a friend that has a press and we'll put some heat on it and see if that works. If not I'll be looking for one online here
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5458 |
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I absolutely agree that it is not necessary to used the disc brake brackets for a drum/disc conversion. I just didn't want the OP to assume that the brackets were the same for both a stock drum and a stock disc applications. |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Well 6PakBee, I for one am happy that the information the OP is getting is based on the photo evidence you presented. Now this info is archived as the two systems had different brackets and linkages. Good info. Thanks for posting the pics ! |
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70 Javelin SST, second owner, purchased 1972
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Rustaholic
AMC Fan Joined: Dec/12/2015 Location: Shickshinny, PA Status: Offline Points: 13 |
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I have a brake booster question maybe someone might have experience with. I'd like to convert my 69 javelin to power brakes, just manual drums now. I'll probably just get it anyway to save it from getting scrapped but would the power brake setup from a 65 287 classic have any value for me? I also have some jeep commando booster/bracket that look very similar. I think there's a 64 ambo with power brakes yet too. And would the spindles and caliper brackets from a later gremlin have any value if i eventually want to convert to disc brakes? Just seemed like a good thread for some brake questions. Thanks! ☺
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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The main purpose of the bracket is to lift the booster higher to clear the engine. The disc booster back in those days as a larger diameter than the drum booster. There is some difference in the lever ratio, but that is part of what made those power discs so touchy back in the day. I use a drum booster bracket on my car. It requires a bit more pedal effort, but I like that -- not as touchy as the old power brakes used to be.
As long as the bracket lifts the booster enough to clear you can use one form any car or the Jeep bracket. Ford and Chevy used similar brackets in some of their cars and trucks. You might have to "adjust" the hole in the firewall and the length of the pushrod from pedal to bracket if you use something other than a small car (Javelin/AMX/American) bracket of around the same year. If you use a Ford/Checy/Jeep bracket you may have to drill new firewall mounting holes. I've done a couple with modified brackets. I'm currently running a 65 Classic bracket with a Ford Ranger booster and master on my 63 Classic. Took modifying the bracket and booster rod to make that work. |
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Frank Swygert
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Dirtydog
AMC Apprentice Joined: Nov/20/2017 Location: Harleysville PA Status: Offline Points: 67 |
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Karl I was thinking about what you said about the pedal being closer to the floor. Next time you're on a hill shut the key off see if the brakes will stop the car with the motor not running. Normally the car will stop without the help of the brake booster but since you changed the pedal I am just wondering if you have enough pedal now to still stop the car without the help of the brake booster. It's just a test for your safety I think it will stop but I was just curious.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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Do note that you may need both feet on the pedal to stop the car without the booster -- takes a lot more leg effort due to a different pedal ratio than manual brakes.
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Frank Swygert
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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One more thing -- if you are using a manual brake pedal with a booster it WILL go down close to the floor. It's the pedal ratio... manual has needs more leverage, power needs more travel and is a bit higher at rest (brakes not applied).
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Frank Swygert
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Rogue401
AMC Addicted Joined: Nov/26/2010 Location: New York Status: Offline Points: 1280 |
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I'm having trouble finding a booster and bracket that fits our 67 Rogue. I have power brakes on my 66 290 Rogue, but I don't want to cannibalize it. I have a 69 AMX bracket but it puts any Booster I have into the shock tower. I always thought one of the purposes of the bracket was to change the manual pedal ratio of 6:1 to 4:1 for power brakes. The 6-1 would be way to touchy for power brakes
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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The bracket isn't what changes the pedal ratio. The position of the pushrod on the pedal does. On later model car there are two holes in the pedal arm, the upper for power brakes, lower for manual. That started around 67-68? Maybe as late as 70-71? In other words I'm not sure when... but sometime around the late 60s to mid 70s. You might be able to drill your existing arm, but the arms aren't hard to change. The bracket moves the master cylinder and booster up so it clears the engine and spring tower. I would think the AMX bracket would work. Measure the diameter of the 66 Rogue booster. Are you trying to use a larger diameter booster? Some have used this 7" booster setup: It lifts the setup high enough and has the correct size master cylinder (1" bore). You would need to make a pushrod the correct length. One note: if you order from Master Power just tell them it's for a Ford Torino, or a street rod. For legal reasons if you tell them it's for an AMC they will say they don't carry anything for an AMC and won't sell it to you. This kit from Speedway is about the same: The pushrod length would be easier to change, I think, since it's a threaded rod. Speedway doesn't carry a Torino kit. I'm not sure if the side to side dimension of the firewall mount holes on the Chevy kit are thee same as on the AMC. The lower holes are slotted, so no worries top to bottom.
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Frank Swygert
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