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#1 |
Join Date: Jan 2018
Location: Grants Pass, OR
Posts: 18
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New hawk250 rear brake issue
Have a couple weeks on the bike and have had a problem with the rear brake since assembly. They haven’t held any pressure in the system even after the initial flush. On the first ride, the rear brake faded and would not stop the bike. While bleeding, it continued to push air out, even after several ounces of fluid. I suspect a leak in the slave cylinder (noticed brake fluid during assembly). What is the best way to rule out faulty seals and location. If I can figure this out I can have the part shipped out on warranty.
Thanks, Russ. |
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#2 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Do you still find any wet spots on the braking system after riding? If it introduces air while simply bleeding, and it is indeed a leak, it shouldn't be too hard to locate said leak.
Otherwise, the fading out while riding can also be caused by the rear brake adjustment. This is a common issue with new bikes. If there is no free play in the pedal then it will put a tiny bit of pressure on the brakes. As you ride the brakes will rub and slowly heat up, eventually leading to brake fade.
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#3 |
Join Date: Jun 2011
Posts: 1,335
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Bad crush washers on the banjo fittings will leak and also allow entry of air into the system. A little piece of grit in the master cylinder will also cause brake fade or loss of pressure like the system is full of air. I am experiencing that on my current bike. I need to tear it down and clean it out. I just don't have time to fool with it.
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#4 |
Join Date: Jan 2018
Location: Grants Pass, OR
Posts: 18
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I have not noticed any brake fluid after riding, but I’m not sure I could tell, the bike has been getting pretty wet from the riding terrain. I have the brake pedal adjusted with quite a bit of travel (I’m adjusting it at the master cylinder), although it doesn’t start actuating the brakes until almost to the end of the pedal travel.
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#5 | |
Join Date: Jan 2018
Location: Grants Pass, OR
Posts: 18
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Quote:
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#6 | |
Join Date: Jun 2011
Posts: 1,335
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Quote:
I don't know what fluid you are using but I use Valvoline DOT3/4 and it works well. It seems to bleed easier than moto spec brake fluids. It could be all in my mind too. ![]() |
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#7 |
Join Date: Dec 2015
Location: CO
Posts: 1,525
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Mag 1 makes a really good DOT 4 brake fluid too, keep an eye on amazon to pick a case of them up for cheap
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"Think as you like... but this self proclaimed Professor is always right" - Buckshot ![]() "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P. |
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#9 |
Join Date: Jun 2011
Posts: 1,335
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You're welcome.
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Tags |
brake, hawk 250, leak |
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