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Bad Brake Switch?
Posted: Sun Jan 14, 2007 5:36 pm
by Scooter
Now that I have LED tail lights. The brake lights on the back seem to flash and come on intermitaly, even when the truck is sitting still and the brake pedal is not moving. Bad brake switch is my guess? I looked at the schematic and found the wires. But where is the switch located? How do you replace it?
Any help would be apreciated.
Scooter
Posted: Sun Jan 14, 2007 5:50 pm
by Jim LaGuardia
The switch is on the master cylinder facing forward. Check for missing insulation or melting of the wires near the switch
The switch just threads into the master cylinder.
Posted: Sun Jan 14, 2007 7:35 pm
by Scooter
thanks Jim, I'll give it a look see.
Scooter
Posted: Sun Jan 14, 2007 8:10 pm
by Profpinz
I was forever having problems with the hydraulic brake switch .... something I put down to the fact that I use silicon brake fluid ("maybe" it was migrating into the internal workings/contacts or something) as nobody else seemed to have anywhere near the failure's I did.
Replacement was a "b*^*&" given my Pinny is RHD, so I cured the problem by fitting a mechanical switch to the pedal box .... and all's been sweet ever since!
....so "if" anybody is using silicon fluid keep an eye on the standard switch.
Posted: Mon Jan 22, 2007 8:45 pm
by Scooter
Well I have been trying to find the problem with the intermitant flash on the brake lights. It seem the brake switch has some votage going thru it even when not used. I has about 1.5 to 2 volts on the meter at times. My guess it should always read "0" when not used. I am thinking there is a contact going bad or something make contact when the brake is not pressed.
Is the brake switch wet or dry? Can it be removed without loosing the brake fluid? I want to replace it, but not sure how? thanks for the help.
Scooter
Posted: Mon Jan 22, 2007 9:52 pm
by Jim LaGuardia
Wet, you must bleed the masterafter installing the new switch.
Posted: Tue Jan 23, 2007 5:47 am
by Scooter
thanks Jim. I am going to look at doing it.
Scooter
Posted: Tue Jan 23, 2007 11:45 pm
by Jimm391730
The switch will have ~24V between the two terminals when the brake is NOT depressed, when the switch is activated then you should see ZERO volts between its terminals.
Jim M.
Posted: Wed Jan 24, 2007 5:35 am
by Scooter
Jim M.
That is completly opposite of what I measured with the meter. When I pushed the brake, that is when I got the 24V. I'll have to look at that again. :?: Thanks
Scooter