Author Topic: CB500K1 front brake stop switch  (Read 416 times)

Offline AndyH

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CB500K1 front brake stop switch
« on: December 12, 2020, 10:17:07 AM »
Hi folks, it appears the subject switch on my K1 has packed it in!   :(
DSS et al apparently don't have any in stock.
Can the switches be refurbished in any way?

Andy

1972 CB500 Four K1 (AUS version) 8)
1978 Suzuki GS750E
Previously....
1967 Honda Sports 90
1971 Yamaha CT2 175
1973 Yamaha RD250
1975 Kawasaki KX125
1979 Yamaha XT250T
BMW R65
BMW R80
BMW R100LT

Offline JezzaPeach

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Re: CB500K1 front brake stop switch
« Reply #1 on: December 12, 2020, 11:03:11 AM »
Thirty quid posted or so on eBay but someone on the forum should have a good used one. They are common to loads of models.
1972 CB500/4 K1 Gold
Wanted: my 500/4 UGP96M
from 1975-78. Garnet Brown.

Offline paulbaker1954

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« Last Edit: December 12, 2020, 12:26:22 PM by paulbaker1954 »
If you think there's light at the end of the tunnel it's usually another train !!

2016 Yamaha MT09 Tracer
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Offline Bryanj

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Re: CB500K1 front brake stop switch
« Reply #3 on: December 12, 2020, 01:13:10 PM »
In answer to the original question, no they cant be refurbed.

I canh have a look in my lockup but not toll next weekend now

Offline AndyH

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Re: CB500K1 front brake stop switch
« Reply #4 on: December 17, 2020, 01:42:30 AM »
In answer to the original question, no they cant be refurbed.

I canh have a look in my lockup but not toll next weekend now

Thanks in advance Bryan!
Andy

1972 CB500 Four K1 (AUS version) 8)
1978 Suzuki GS750E
Previously....
1967 Honda Sports 90
1971 Yamaha CT2 175
1973 Yamaha RD250
1975 Kawasaki KX125
1979 Yamaha XT250T
BMW R65
BMW R80
BMW R100LT

Offline AndyH

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Re: CB500K1 front brake stop switch
« Reply #5 on: February 10, 2021, 10:17:02 AM »
OK so DSS were able to source a genuine replacement from their US store, which arrived yesterday.
Is there a way to replace the faulty switch without having to completely drain the brake fluid?
Andy

1972 CB500 Four K1 (AUS version) 8)
1978 Suzuki GS750E
Previously....
1967 Honda Sports 90
1971 Yamaha CT2 175
1973 Yamaha RD250
1975 Kawasaki KX125
1979 Yamaha XT250T
BMW R65
BMW R80
BMW R100LT

Offline Oddjob

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Re: CB500K1 front brake stop switch
« Reply #6 on: February 10, 2021, 10:40:03 AM »
Fraid not, as soon as you remove the old switch it will allow air into the system, try clamping the pipe above the junction to stop the fluid draining down from the master cylinder as that will make bleeding the system afterwards much easier.
Don't play stupid with me, I'm better at it

Offline AndyH

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Re: CB500K1 front brake stop switch
« Reply #7 on: February 11, 2021, 12:33:26 AM »
Fraid not, as soon as you remove the old switch it will allow air into the system, try clamping the pipe above the junction to stop the fluid draining down from the master cylinder as that will make bleeding the system afterwards much easier.

Thanks.
Andy

1972 CB500 Four K1 (AUS version) 8)
1978 Suzuki GS750E
Previously....
1967 Honda Sports 90
1971 Yamaha CT2 175
1973 Yamaha RD250
1975 Kawasaki KX125
1979 Yamaha XT250T
BMW R65
BMW R80
BMW R100LT

Offline AshimotoK0

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Re: CB500K1 front brake stop switch
« Reply #8 on: February 11, 2021, 08:21:53 AM »
I sometimes recover them by applying a very high voltage across them, whilst operating them hydraulically. Once the spark across the contact gap  cleans away some of the contact corrosion, they often come back to life again. Then once a resistance is built up,  by repeatedly switching a couple of amps through them  from an inductive load (e.g. like the solenoid start switch coil) they gradually build up a very low resistance again.

However if they have leaked hydraulic oil inside they are generally fooked. Same goes for engine oil pressure switch and similarly for 400/4 etc horns.

Also plenty around used, as stated previously.
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

 

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