Problem with front brakes.

I am having a problem with the dual calipers on my Seca 750. When I pull the brake lever in, they lock up on me and the only way I can get them to release is to open the bleeders. What would be causing this? Also another question I have is what the heck is that thing below the calipers which also has a bleeder and brake line hooked to it? From what I can see there are 4 bleeders on the front brakes? Do I have to bleed all 4 of them? 8O

 

Crud in the brake fluid is stopping up the return hole. You need to wash out all the old fluid, dirt and water in the master cylinder then put in fresh fluid and bleed the whole thing. The lower part is anti-dive, you will need to bleed that too. A mity-vac vacuum pump works the best for bleeding but you can do it the old fashioned way if you are determined enough to keep at it until you get all the air bubbles out.

 

I think you have an anti dive system - when you hit the brakes it also activates an anit-dive piston in the front forks. I don't have it on my 750 Maxim, but i had one of those systems on my '83 Suzuki 1100E

 

You probably need to take the calipers apart and lube the the slides up good. They stick and won't slide, keeping one pad against the rotor after you apply the brakes. The calipers are made to "float" and self-center themselves on the rotors. PD

 

You definitely have the anti-dive system on your bike. the brake sys works w/the suspension to stiffen it during heavy fron braking.

P.M. me if you want the illustrations for it.

 

70, Steve is right. Your return hole has been plugged up with crud. Get yourself ready to clean out the whole system. Spring the dough and get the caliper and master cylinder rebuild kit. New brake lines (stainless steel) are a wise investment as well at this point (age does take it's toll on the rubber lines). Expect to spend about $300 and do it right from top to bottom. I just went through this this last October and I'm telling you, there is no substitute for fresh brakes!