Why Does Brake Fluid Flow to Front Calipers

[Suzuki_Don]

I have read quite a few posts on here about people that have had trouble when filling their front brake system with fresh fluid and that they can't bleed the system or even get any fluid flow to the caliper bleed nipples. And there are various tips to get that initial flow to happen.

In my case it has been the complete opposite. When I fitted rebuilt calipers, new s/s brake lines and rebuilt master cylinder I left the caliper nipples open (unscrewed) then filled the master cylinder with fluid. I was then called away to help a friend for about an hour thinking the fluid won't flow and it will stay just where it is untill I get back.

When I returned the fluid was all over the floor and the M/C was completely empty. Can anyone explain what the problem is and how the fluid could have possibly passed the two rubber cups/seals in the M/C and emptied onto the floor without the brake handle on the M/C ever being touched. And could this be the reason for my spongy feeling front brakes?

QUES 2: I've read Cliff's article on replacing the rear caliper brake pads, but there is no explanation if the opposed pistons need to be pushed in to their original positions to allow for the thicker new brake pads to be fitted. Can they be pushed back by hand or does it require something a bit stronger than that? How is it done? Does the caliper need to come apart to retract the pistons?

One more questions: Where can I obtain the driven joint spline that goes in the rear wheel of a Suzuki shaft drive bike as in the GS Series? I can't find anything on Ebay. Are there any other avenues that anyone knows of?

Thanks.

 

[Nessism]

I believe the little replenishment hole passage allows the fluid to drain out when the lever is not pulled. That's how the fluid is feed into the system to compensate for pad wear.

Yes, the rear pistons need to be pushed in. A C-clamp works well, after you open the top of the reservoir to allow fluid to push backwards...though that small hole again.

Dealers still sell those splines. If it costs too much money down your way I have a brand new spare I'll sell you. Drop me a PM if you want to discuss.