need basic info re stop light switch

[zubzub]

Air operated stop light switch just after the brake pedal.  Seem to piss alot of air through the vent hole.  To my mind this is because the diaphragm is leaking.  It looks like common  simple little screw on part (definatly not original to the bus) still works just leaks out the vent.  First thought was to just pull and replace it 2nd was to ask before I made more work.

[redbus]

Mine leaked a lot also so I went to N.A.P.A. bought a new one and installed it. One of the very few easy jobs on a bus.

[bevans6]

When do they leak?  when the PB is on or off?  When the service brake is on?  If it's a noticable leak, can you still pass the leak-down test (no more  that 3 psi on a full brake application, compressor off, over 1 minute)?

curious about what i should be watching and listening for.
Brian

[zubzub]

it's the switch that turns the brake lights on... only has pressure when the brake pedal is depressed. so it only leaks when the BP is depressed, but then it's getting pretty cold and dark up here so the BP is depressed a lot of the time

[Busted Knuckle]

JD @ C & J Bus repair in Bloomington, MN 800-228-7349 has an economical replacement in stock! I have used several of them with no complaints!  FWIW   BK