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Old May 25th, 2019, 11:36 PM   #1
minimatt
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Noob Question About Front Brake Lights

Hey guys,

I purchased my first bike ('08 Ninja 250) at the start of this year which I bought for dirt cheap. I'm the 5th owner and seems like it's been neglected for a long period of time. Simple tasks like chain cleaning and adjustment were never done, and the bike in general is just in pretty bad condition.

The bike is in way better shape now than when I bought it. There are just a few more jobs to perform before everything is in working order.

The problem:
I need to replace the entire brake caliper and front master cylinder assembly.

I'm quite confused on how the front brake lights are connected to the front master cylinder. Is it just a wire running from the brake switch underneath the master cylinder?

I'd like to know this information before I commit to dismantling my front brakes and encounter a blank wall as my bike is my only form of transport and would prefer to do this job in 1 day.

Your help is much appreciated!
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Old May 26th, 2019, 06:18 AM   #2
Triple Jim
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It's actually two small wires, one to each terminal of the little switch on the master cylinder. It's shown in the motorcycle's wiring diagram in case you forget.
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Old May 26th, 2019, 07:43 AM   #3
ducatiman
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Quote:
Originally Posted by minimatt View Post
Hey guys,

The problem:
I need to replace the entire brake caliper and front master cylinder assembly.
Replace? Each able to be rebuilt to become operational, you know.
Even painted to look pretty again.

On what basis are you condemning them to the junkpile?
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Old May 26th, 2019, 08:56 AM   #4
minimatt
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Quote:
Originally Posted by Triple Jim View Post
It's actually two small wires, one to each terminal of the little switch on the master cylinder. It's shown in the motorcycle's wiring diagram in case you forget.
Noted, thank you! I'll look out for the wires.

Quote:
Originally Posted by ducatiman View Post
Replace? Each able to be rebuilt to become operational, you know.
Even painted to look pretty again.

On what basis are you condemning them to the junkpile?
My front master cylinder cap screws are stripped and refuses to come off, which means I have no way to refill the bike's braking fluid once I bleed them.

The pistons on the brake caliper wont push back despite using a piston rewind tool. The caliper itself is probably rebuildable to working order as you said, but I found one online from a Ninja with only 1,000 miles on the clock. I figure it would just save me a lot of hassle with a neglected one if I just purchased an entirely new caliper.
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Old May 26th, 2019, 09:18 AM   #5
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your call, good luck with it
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Old May 26th, 2019, 05:39 PM   #6
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There's front brake lights???
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Old May 26th, 2019, 05:49 PM   #7
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Quote:
Originally Posted by minimatt View Post
My front master cylinder cap screws are stripped and refuses to come off, which means I have no way to refill the bike's braking fluid once I bleed them.
Do you mean screw-heads on cap is buggered, or threads themselves in resevoir below?

Need to use JIS screwdriver tip instead of philips, probably too late now.

Using hammer impact driver will often remove these screws .
https://www.harborfreight.com/impact...ase-37530.html

Worse case, use 4mm bit to drill out just heads of screw. Pop off cap and remove stubs of screws with pliers. Then replace screws with new ones using anti-seize.

All above procedures are still quicker and less effort than replacing master-cylinder. Bleeding from scratch with empty cylinder and line is pain. I suggest tying caliper up so bleed-screw is higher than MC.
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