front brake issue.

[Guest]

Okay 1982 GS750E

Front brake does have antidive system.
My issue is a sticky front brake.

After sitting for a while it will free up completly.. but once you start riding it progressively gets worse..

last time i rode it it was almost locked up and SCARY!! i was very close to home so i did ride it home but dont wnat to do it again.

The lever gets VERY hard and the calipers dont release.

I think i covered most of it.

Cafekid said to bleed the front brakes. and i will do that first.

but any other ideas?
or anyone had this problem?

also can you tell me the order for bleeding antidive brakes.


One more thing.. my rear brake is super soft. like push down all the way it barley slows..
Should i just try bleeding it as well?

[hampshirehog]

If I were you I would strip the system down completely and do a thorough clean of the MC (stripped down), hoses and MC (stripped down). You have some muck in there somewhere for sure.

Same for your rear brake plus you may have a leak in there as well.

To bleed your anti-dive, bleed the caliper on each side first and then the anti-dive.

[Big T]

Did you ever flush your brake system?

However, I agree with HH, you need to pull the calipers off and the pistons out. You'll probably find interesting stuff in there. Check your pistons and replace the O rings

Same with your MC. Pull out the piston and get all the crap out of there

Brake fluid attracts water. You'll be amazed what people find inside working brake systems

Since yours isn't working, advanced maintenance is required

[BassCliff]

Hi,

Yes, it sounds like you have some high water vapor content air in your brake lines. When it heats it expands. This locks up your brakes. Completely drain and replace the brake fluid immediately. It wouldn't hurt to rebuild the calipers and master cylinder too.


Thank you for your indulgence,

BassCliff

[tkent02]

What you have is a blocked return port in the master cylinder.
Take everything apart and clean it all out. Calipers, Master cylinders, all of it. You will probably find brown sugar where the fluid should be, rust where clean metal should be, and some other scary stuff that should not be found anywhere near a motorcycle. Forum members here have dumped hard from ignoring this problem. Your rear brake has likely had the same lack of maintenance and probably is just as bad inside.

[BassCliff]

What you have is a blocked return port in the master cylinder.
Take everything apart and clean it all out. Calipers, Master cylinders, all of it. You will probably find brown sugar where the fluid should be, rust where clean metal should be, and some other scary stuff that should not be found anywhere near a motorcycle. Forum members here have dumped hard from ignoring this problem. Your rear brake has likely had the same lack of maintenance and probably is just as bad inside.

There you go. Just do it all, and do it right the first time. This is the best solution. Brakes and tires are something you absolutely don't cut corners with. I have read stories of front brakes locking up "for no reason". One guy had his daughter on the back with him. I'll bet that was scary.


Thank you for your indulgence,

BassCliff

[Im Faster]

Yeah i havent been riding beacuse of this and have been in the hospital but im out now and want to start this..

is there a write up on how to do this anywhere?
im worried about getting air in the antidive

[TheCafeKid]

Yeah i havent been riding beacuse of this and have been in the hospital but im out now and want to start this..

is there a write up on how to do this anywhere?
im worried about getting air in the antidive

It's gonna happen. It's easy to bleed off. And no, no fork oil or anything will come spurting out. Do you have a manual for that thing? If not bare minimum stop by my place around 5:45 and I'll lend you mine. I can't help ya this evening. My boys got a school event but the manual will help ya for sure or I might be able to help you tomorrow evening for a bit at least to get you started.

[Im Faster]

okay.. i ended up getting a garage here so its not such a pain to work on it here anymore. lol now that its nice id like to be able to take it to school ill stop by

[MAC10]

I agree with all the above. As tkent02 says, it is likely a blocked return port from old gunk. A rebuild is in order, and new rubber parts front and rear to be safe. Had the same problem last season, and that was the cure.

[Nessism]

Full tear down is definitely in order. And replace those soggy old rubber brake lines at the same time.

[Im Faster]

I flushed and bled the brakes.

Didn't help I did not clean the return port... not sure how

[Steve]

It's the little tiny hole in the bottom of the master cylinder reservoir. Not the larger hole that you can see, though, it's usually hidden by a baffle. You have to take the master cylinder apart and poke a very small wire through the hole to get the crud broken loose. Then, flush it with brake cleaner. Re-assemble, fill, bleed, ride.

.

[Im Faster]

Yeah i saw where it was.. and it was full of crud.. i used a small screw driver to try to clean out the hole some.. but it didnt get through the port.. i gotta find some wire to do this i guess.. should i unhook the like from the backside of the master cylinder before doing this?

[Nessism]

Your entire brake system is full of that same crud that blocked that hole off.