Got an '82 650 Nighthawk and the front dual discs keep locking up after being engaged. The lock up is gradual with more use. The brake handle gets harder and then the wheel eventually locks. Do I need to replace the Master Cylinder, bleed the brakes, replace the brake lines? I also found rust in the current Master Cylinder Reservoir. Help?
2007-01-28 14:04:38 · 9 answers · asked by Keith N 1 in Cars & Transportation ➔ Motorcycles
This is not an issue to play around with, that being said, You should, at the least, rebuild your master and calipers and replace your brake line. When you get it all back together use DOT 5 brake fluid. It is non-corrosive, will not hurt your paint, wheels, and most of all your brake components. Good Luck and Happy Trails!!!
2007-01-29 05:10:36 · answer #1 · answered by sportyguy_ss 1 · 0⤊ 0⤋
Rust is a bad thing, I had an 83 nighthawk 12 years ago and remember something like that happening and think it was the brake line. Try bleeding the brakes until all the old fluid in gone, if it still holds pressure locking the breaks try cracking the line loose off the master and work your way down to the calliper. Doing this you should be able to pinpoint where the pressure is being held and the problem.
2007-01-28 14:17:50 · answer #2 · answered by misc 75 3 · 0⤊ 0⤋
this is more than likely your problem you don't necessarily need to rebuild the master cylinder or the calipers all they probably need is a good cleaning because rebuilding them can be costly your lever is getting harder because your bleed back hole is clogged or dirty there are 2 holes inside the master 1 large and 1 small the small hole is probably 1 of your problems try this before you start any of the other costly repairs pull a wire out a wire brush and clean the small hole out the hole is very small so take your time and be sure it is clean. If that dosent work try cleaning your calipers you can do this 1 of 2 ways you can either use the master cylinder to push the pistons out of the body's or competely remove them and use an air nozzle but either way you need to be very carefull this can be very dangerous I have seen people lose their fingers doing this so go slow and take your time be sure you remove both pistons from each caliper at a time dont let one come out at a time if you do tou will have a hard time getting the second one out.Once you get the pistons out there will be 2 seals in each hole or 4 seals per caliper you need to remove each seal and thuroughly clean behind the seals you'll have to use a pick and maybe a flat head screwdriver to do this and use your fingernail to clean the seals and be sure to check the pistons make sure they are clean and free of any pits in the metal if they have pitts in them you'll need to replace them. OK on reassembly all you need to do is of corse reverse order but you'll need to lubricate the pistons use brake fluid only not anything else that could harm the seals like grease dont use grease. good luck I hope that helps
2007-01-28 16:47:00 · answer #3 · answered by michael m 2 · 1⤊ 0⤋
you need to at least rebuild the master cylinder and flush the line out from the bottom. Hopefully the rust has not made it to the caliper.you will be able to tell this by fluid seeping around brake pads.When you are assembling make sure to bleed the m/c and that the lever depresses smoothly and returns by its self. ps : when rebuilding any brake component be careful not to scratch the bores, check for leaks, and pay specific attention to detail. be careful and good luck.
2007-01-28 14:52:44 · answer #4 · answered by amber h 1 · 0⤊ 0⤋
Start with a manual and tear down the whole system. guardrail jim gave you the #1 problem to look for, michael m gave you the #2. Rust in the reservoir is a sure sign. The stuff is all through your system. When you put it back together, use NEW fluid from a sealed container. Do not change to DOT5 unless your manual specifically calls for it. Check the date on your hoses, too. they are probably way overdue for replacement. I think it's supposed to be every 10 years.
2007-01-29 11:23:26 · answer #5 · answered by Firecracker . 7 · 0⤊ 0⤋
The brake calipers will most likely need to be rebuilt. Crud builds up underneath the seal and presses against the piston, preventing the piston from returning.
2007-01-28 14:19:44 · answer #6 · answered by guardrailjim 7 · 0⤊ 0⤋
sounds like you may have solved the problem yourself. If you had rust in the master cylinder, you probably have it in the brake cylinder. I'd replace both
2007-01-28 14:11:48 · answer #7 · answered by sk33t3r 3 · 0⤊ 1⤋
Let go of the handle
2007-01-28 22:31:24 · answer #8 · answered by Anonymous · 0⤊ 1⤋
before you confuse yourself, reading through all of that relevant AND irrelevant info, i suggest you bleed your brake, remove all old oild, then fill her up again. AFTER that you can consider other options. go step-by-step
2007-01-28 17:58:21 · answer #9 · answered by BigBear 2 · 0⤊ 2⤋