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01-21-2022, 02:57 PM | #1 |
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Pressure Switch Question
I have a (faulty?)pressure switch from my 1939 Ford which I have replaced. Does anyone know if it can be bench tested and how that is done? Thanks!
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01-21-2022, 03:27 PM | #2 |
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Re: Pressure Switch Question
Pressure switch?
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01-21-2022, 04:00 PM | #3 | |
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Re: Pressure Switch Question
Quote:
Assuming that you are talking about the BRAKE light PRESSURE SWITCH? Are we close? If so, and since the thread are going to be sort of hard to find a match for for testing, the easiest way to test is screwed into the fitting on the master cylinder. BEWARE that you must not have allowed a bunch of air in while changing, or bleed it out to create the hydraulic pressure needed to activate the switch. With all of those parameters satisfied, and the two wires hooked-up to the switch, push the pedal down. IF the brake lights do not illuminate, disconnect the two wires from the switch. NOW, touch the ends of both wires together. IF the brake lights illuminate now, the switch is likely defective. DD . |
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01-22-2022, 10:11 AM | #4 |
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Re: Pressure Switch Question
Air compressor.With the right fittings and adjusting the pressure.I have tested the oil pressure senders this way before.
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01-22-2022, 10:34 AM | #5 |
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Re: Pressure Switch Question
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01-22-2022, 10:46 AM | #6 | |
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Re: Pressure Switch Question
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Quote:
You assume correctly that it is the Brake Light Pressure Switch. BLS is already off of the MC and on my bench and replaced by a good one. New one works fine on the car. This one did too until it quit. While this bad one was on the MC, I did the two wire touch and the lights worked so i replaced the switch. Just looking to verify that this switch really did go bad in four months time assuming there is an easy quick way to bench test. Unfortunately I trashed the old MC.
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01-22-2022, 12:42 PM | #7 | |
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Re: Pressure Switch Question
Quote:
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01-22-2022, 01:29 PM | #8 |
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Re: Pressure Switch Question
For those considering an upgrade in their brake light pressure switch, this
was just posted on HAMB. Looks promising but, expensive. Thread is worth reading. https://www.jalopyjournal.com/forum/...grade.1254002/ |
01-22-2022, 09:22 PM | #9 |
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Re: Pressure Switch Question
If you’re not looking for 100% restoration, what I’ve done is install a relay within the circuit. Then the brake light switch just makes an breaks the ground to the switch. A 6 volt horn relay works great.
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01-22-2022, 10:02 PM | #10 |
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Re: Pressure Switch Question
.
These work great, too! They even come 'LEFT' or 'RIGHT Handed'. DD |
01-23-2022, 01:24 AM | #11 |
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Re: Pressure Switch Question
Coopman has it right! Those are less than $10 and work every time.
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01-23-2022, 04:57 AM | #12 |
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Re: Pressure Switch Question
pedal switch way to go did 3 pressure switch's inside 12 months [macs & bd ] supplied went to pedal switch 6 years and counting
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01-23-2022, 01:43 PM | #13 |
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Re: Pressure Switch Question
peddle switch it is when this pressure switch goes kaput
now to figure out where to mount it on a 1939 vert. In the cab also like ken's idea of a relay within the circuit but have no idea how to wire this up
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01-23-2022, 01:47 PM | #14 | |
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Re: Pressure Switch Question
Quote:
Sounds interesting. Not sure how this is wired up?
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01-23-2022, 02:08 PM | #15 |
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Re: Pressure Switch Question
I have had old Fords with hydraulic brakes for over 60 years, and have never had a problem with an original switch. It may be because that's all I've ever used. If I ran across a decent looking one, I'd clean it up and throw it in a drawer.
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01-23-2022, 02:29 PM | #16 | |
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Re: Pressure Switch Question
Quote:
Here ya go! Picture this mounted on the BOTTOM side of the driver side wooden floor board. That is the brake pedal you see running vertically in picture, which allows switch arm to be activated. DD |
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01-23-2022, 03:05 PM | #17 |
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Re: Pressure Switch Question
Roger That and Thanks That really helps
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01-23-2022, 06:35 PM | #18 |
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Re: Pressure Switch Question
I found one Friday at my local NAPA. Not sure if the prongs are the right diameter, a little larger than 1/8”.
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