rear brake switch adjustment

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DucMonzter
Posts: 28
Joined: Sun Feb 02, 2014 4:05 am

rear brake switch adjustment

Postby DucMonzter » Tue Jan 02, 2018 7:33 pm

Happy New Year!

I am attempting to adjust the original, Aprilia brake light switch on a Monza Junior. The extension spring from the brake pedal fails to pull the plunger far enough to close the circuit. However, the switch is in good working condition and will activate by directly pulling the plunger 5-6 mm. What is the best way to adjust these switches?

I appreciate any advice or recommendations.

Thanks,
Jeff

Bevel bob
Posts: 773
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: rear brake switch adjustment

Postby Bevel bob » Wed Jan 03, 2018 8:35 am

Shorten the spring?.

Vintmoto
Posts: 43
Joined: Sat Apr 11, 2015 2:54 am

Re: rear brake switch adjustment

Postby Vintmoto » Wed Jan 03, 2018 12:28 pm

These bikes are basic. As mentioned in the previous post, the best bet is to try a different spring or swap out switches to see if you might have one that activates sooner. Not many other options.

Buster
Posts: 17
Joined: Fri Dec 22, 2017 12:56 am
Location: Reading, UK.

Re: rear brake switch adjustment

Postby Buster » Wed Jan 03, 2018 7:44 pm

Clean the plunger on the switch and light lube, reduce drag on spring.

DucMonzter
Posts: 28
Joined: Sun Feb 02, 2014 4:05 am

Re: rear brake switch adjustment

Postby DucMonzter » Thu Jan 04, 2018 1:44 pm

Thanks for the recommendations. I'll try shortening the extension spring to increase spring rate until the system functions. My other thought was to increase preload by moving the switch rearward on the bracket by installing another jam nut. I was just wondering if I was missing something basic.

Jeff

amartina75
Posts: 321
Joined: Tue Aug 21, 2012 1:13 am
Location: Cincinnati, OH. USA

Re: rear brake switch adjustment

Postby amartina75 » Thu Jan 04, 2018 3:03 pm

I would take the switch apart and clean/lube it. It probably needs to be pulled too hard or far because it’s dirty/worn
1966 250 Scrambler
1970 450 Jupiter

DucMonzter
Posts: 28
Joined: Sun Feb 02, 2014 4:05 am

Re: rear brake switch adjustment

Postby DucMonzter » Wed Jan 24, 2018 4:32 pm

Just to close the loop on this subject, the brake switch adjustment was accomplished with the slotted holes in the mounting bracket. I was missing the obvious... I'd still prefer the light to activate a little earlier in the travel but at least the setup now works.

Thanks for the help,
Jeff


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