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Brake block warning light on top cluster stays on |
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VJIAMX
AMC Apprentice Joined: Aug/07/2022 Location: West Seneca ny Status: Offline Points: 238 |
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Posted: Aug/07/2022 at 4:16pm |
Wondering if anyone can tell me causes for this issue when I remove the wire from switch in valve at firewall, the light goes out, brakes seem to work fine no shimmy at pedal??? Thanks
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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What does no shimmy at the pedal have to do with the switch telling you there's a pressure differential?
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troutwilly
AMC Addicted Joined: Sep/14/2007 Location: Carriere, MS Status: Offline Points: 992 |
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The switch where you disconnected the wire is the pressure differential switch. It tells you exactly that....there's a pressure difference between the front and rear brakes. Could be caused by a leak, or have you recently bled the brakes? You will need to fix a leak first, then remove (un-screw) the switch to let the plunger re-center (the indentation or narrow part of the plunger should be centered below the switch) and re-install the switch. Brake fluid will not leak out, air will not enter the system when removing and re-installing the switch.
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Bill O.
70 AMX |
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mbwicz
Supporter of TheAMCForum Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1989 |
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Will the plunger re-center by itself with the switch removed? I'm ready to bleed brakes for the first time on my car (I've gravity fed them). I have the switch removed and figure that the plunger will shift during the bleeding process. I wasn't sure how to re-center it if it shifts during bleeding.
The TSM says to pressure bleed, but I don't have a pressure bleeder. Any tips to avoid hassles? Thanks, Mike
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1694 |
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If the warning light stays on the safety switch contact plunger might be damaged on the end in the switch this can happen if the plunger was not removed before bleeding the brakes, the 70 TSM says to remove the brake safety contact plunger before correcting a brake pressure problem. If you are assembling the system for the first time remove the switch plunger until the system is fully bled and working properly then install the plunger. I have spare plungers because those plungers are easy to damage.
J
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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1694 |
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