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69 Javelin master cylinder replacement |
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FredJav13 
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Joined: Feb/10/2026 Location: Colorado Status: Offline Points: 12 |
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 Topic: 69 Javelin master cylinder replacementPosted: Mar/23/2026 at 2:39pm |
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Afternoon everyone,
69 Javelin with drums all the way around. My master cylinder appears to be leaking somewhere on the back where it connects to the brake booster. Thinking I will replace it as it seems there are available replacement cylinders from any of the AMC vendors. Has anyone used one of these new units? Just wondering the quality or if I should just send my old one out for a rebuild somewhere (assuming its rebuildable).
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nickleone
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Joined: Oct/04/2008 Location: westminster co Status: Offline Points: 1694 |
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Posted: Mar/23/2026 at 3:34pm |
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Are the cylinders NEW or rebuilt units?
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nick
401 71 Gremlin pro rally car sold 390 V8 SX/4 pro rally car sold 1962 Classic SW T5 4 wheel disc brakes |
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ramblinrev
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Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 12975 |
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Posted: Mar/23/2026 at 3:48pm |
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You should be fine with a name brand master. No guarantees, as I've had a new name brand one machined improperly (at the mount).
Be sure you bench bleed. Also, you should take off the booster, if the MC has been leaking into it, and you should get that brake fluid out of there, or it will corrode your booster from the inside.
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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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FredJav13
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Joined: Feb/10/2026 Location: Colorado Status: Offline Points: 12 |
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Posted: Mar/23/2026 at 7:46pm |
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The ones on at least a few of the vendor sites say they are brand new and no core required
Edited by FredJav13 - Mar/23/2026 at 7:50pm |
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FredJav13
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Joined: Feb/10/2026 Location: Colorado Status: Offline Points: 12 |
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Posted: Mar/23/2026 at 7:49pm |
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It seems pretty straightforward to remove the master cylinder, brake lines and booster if needed. Any tricks or tips I need to look out for or is it fairly simple?
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ramblinrev
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Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 12975 |
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Posted: Mar/23/2026 at 8:41pm |
As I said, bench bleed the master according to instructions. And, since it was leaking into the booster, take the booster off, and get the brake fluid out of there, so far as possible. When you have the booster off, be sure to lubricate the bellcrank. Then, bleed your brakes properly (that includes pulling that delicate little center pin out of the brake pressure differential switch on your firewall before bleeding. See the Technical Service Manual".
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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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FredJav13
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Joined: Feb/10/2026 Location: Colorado Status: Offline Points: 12 |
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Posted: Mar/23/2026 at 9:15pm |
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Thank you!
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FredJav13 wrote: