Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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Some master cylinders are designed to keep a small residual pressure on the system to keep the cups set and prevent air intrusion. Maybe your brake light switch is too sensitive. Or maybe a small amount of current is leaking through the switch due to brake fluid getting on the contact side of the diaphragm. Brake fluid often has some moisture and fine rust in it, which could aggravate leakage.The Led lights might respond to a very low leakage current that would not affect regular filament bulbs. I'd disconnect the switch and see if the problem goes away, or replace it.
Posted on: 9/9 21:32
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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Posted on: 9/9 23:01
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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Posted on: 9/9 23:09
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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The other reason for brake lights coming on by themselves is that the the master cylinder is not returning all the way to "home" and is not uncovering the compensator port. Make certain that your pedal push rod is adjusted so that you have at least 1/8" play at the pedal before the piston begins to move. You can also check very easily by grabbing the push rod and attempting to wiggle the cylinder end a bit. If it won't move, you need to have some free play adjusted in.
Posted on: Yesterday 12:11
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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Thanks, Ross.
I’ll check that. I do know that everything worked fine for quite a while and it’s gotten steadily worse. I don’t think anything has changed regarding the adjustment, but it sure won’t hurt to check it before replacing the switch.
Posted on: Yesterday 18:49
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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Okay…checked the adjustment. I don’t think that is the issue. I had enough play and the “wiggle” at the cylinder as described. Since it was easy, I went ahead and back it off a bit to see if it made any difference. I kept track of how much I backed it off. It did not make any difference, so I put the adjustment back where I had it.
I have a switch on hand from O’Reiley’s. I’ll either install now or wait until we are replacing the coil springs depending on my brother-in-law’s availability.
Posted on: Yesterday 19:03
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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It should take all of 5 mins to change out the switch. Three of which is finding the correct wrench.
If you remove the old one and immediately replace it with the new you shouldn't have to rebleed the brakes.
Posted on: Yesterday 19:29
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Don’s 1937 (120) 138CD Deluxe Touring Limo
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Thanks, Kev. I’ll swap it out sometime over the next few days.
Posted on: Yesterday 21:25
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