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1

A couple of things here. First, when I find the brake reservoir low, I will look at my disk brakes to ensure the pads aren't shot (or nearly worn out). Usually, if worn enough, the fluid level will drop to a point where the brake light will come on as you described (most notably so if both back and front are worn out). With that in mind, consider just ...


1

Dot 4 supercedes Dot 3. If you put Dot 4 in, no problem. Basically, Dot 4 can go in and replace Dot 3, chances are you already have Dot 3 in anyway. Wikipedia, Dot 4: While a vehicle that uses DOT 3 may also use DOT 4 or 5.1 Note: Dot 5 is not compatible with either, it is a different chemical makeup based on silcon. Putting Dot 5 in a Dot 3/4 ...


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Pedal feel is always softer until the pads have bedded into the rotors properly. Make sure that you follow a proper bed-in procedure before deciding that you have a problem.


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If the brakes are always spongy, it is air bubbles. If the brakes are only spongy when hot, it is moisture.


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As stated prior, if the rotors weren't machined or lightly surfaced when the pads were changed, that will give you a spongy feel as you are not stopping as effectively and takes more effort to slow down. With new rotors and pads, the machine marks on the rotors help to break in the rotors and pads together. Once broken in, they will work well as they wear ...


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If you have fluid in the brake reservoir, and have no pedal, you have a failed master cylinder. The piston that moves when you step on the brake pedal has o-ring seals that if they fail, can allow fluid to pass by them and not apply pressure to the brakes. All brake systems today have a dual circuit system where if you loss pressure to a wheel (caliper, ...


4

If your brake pedal went to the floor it means that there was not enough hydraulic pressure to apply the brake. If they were working fine before and never felt squishy then your master cylinder has probably gone out and needs to be replaced. Alternatively you may have a lot of air in the lines, enough that the pressure applied by the brake was not enough to ...


0

You need to bleed the brakes, you will have an air pocket in the system. As you stand on the pedal, the system is compressing the air pocket instead of the fluid, hence the brakes won't actuate. Here's a popular mechanics article on how you can do this yourself, or you can take it to a mechanic and they can do it pretty quickly and cheaply for you. This ...


5

It seems as though the plunger in the master cylinder isn't retracting after use Occasionally when motorcycles are stored you can run into this problem. Older brake fluid along with a bit of moisture and oxygen can contribute to a buildup of material inside the master cylinder bore where the plunger goes. After pulling the brake once the plunger sticks ...



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