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Question:

Motorcycle brake problems?

I have a Honda 83 nighthawk 650 with duel front brakes. The brakes keep locking up on rides. If I crack the line at the master cylinder the calipers relaese. I have rebuilt the master cylinder with a kit I bought from my local Honda power sports shop. Replaced brake lines and line hardware. Just took appart my calipers and cleaned pistons replaced seals for piston. Brakes just locked up agian and I don't know where to go from here

Answer:

Air or water interior the brake line might want to teach itself as a softness on the brake lever, requiring countless pumps previously the brakes paintings. Air (and to a lesser volume water) will compress while brake fluid, like each and every hydraulic fluids, does not compress. notwithstanding the indicators you describe look the different. in my view i might want to eliminate the caliper from the fork leg, take out the pads and positioned a timber lath of their position (to give up the pistons popping out thoroughly) and then pump out the pistons (use a G clamp to give up one if it strikes a lot less annoying than the different) – search for any airborne dirt and mud or gunge on the piston sides. i trust that that is your issue. If there is airborne dirt and mud you could sparkling the perimeters of the pistons (with seize and brake cleanser and a rag – no abrasives) for a non everlasting answer – ideally you should empty the device and take out the pistons and fully service the calipers – replace seals and bleed nipple, flush the device with methylated spirits to sparkling it and enable it dry. once think with reference to the brake fluid replaced you would possibly want to besides have this service achieved mutually. also research the lubrication on the draw close cylinder and lever – there could be a blob of grease and it makes a most suitable massive difference to the action of the lever. EDIT: btw the hot pads will take the time to mattress in, 50 odd miles, so is truly not as effective till then – and ensure the compound is actual for the bike, do not be tempted to apply “race” compounds as you'll by no potential get them warm sufficient to apply.
The release port on the master cylinder is clogged. It lets the fluid flow back into the reservoir when the lever is released. There should be a small opening at the bottom of the reservoir just above the piston, clean that out and it should work. *** @realtorbiker - nice, very misogynist of you
GOOD description, are you really a girl ? You did everything right. either this pistons are sticking or the master cyl is not working. If both sets of brakes are tight and do not release without releasing the pressure, then odds favor the master cyl. Having both the calipers fail is less likely. Personally , I would buy a master cyl on OKorder for about $20 delivered and try that.
The okorder /3-inch-indu... Beware of spilling any brake fluid - it dissolves paint. Cover all painted surfaces. The most common problem is the seal in the caliper. It doesn't appear to be your problem, but worth checking out. Remove the seal and scrape clean the groove it sits in. Gunk builds up under the seal, causing the seal to squeeze tightly against the piston.
Good question well written! It sounds as if the return port on the master is blocked. You did rebuild it but this port is tiny tiny tiny. Have a second look at it. It sounds like you did everything right.

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