dyrberg123 wrote:I have just had a hanging fron caliper on my GT380, i rebuild the caliper, fitted it Again, bleeded it and it seemed to behave as intented. But after a short drive it got worse and worse. Fortunately i had an adjustable spanner so i loosend the bleeding screw and it took out preassure. I took the bike home, and yes it was the small return hole in the master cylinder that was blocked. Took it apart, and cleaned the small hole with a drillbit - now it Works.
+1 to all those that suspect the master cylinder !!
Cheers,
Roger
Suzuki GT750A
Everyone should own a Mighty-Vac. I actually got mine from Harbor Freight. Originally bought to do the brakes on an MG. Works great on bikes too. $30 well spent.
I never tried, but I understand the best way to bleed bikes is from the bottom up with a syringe. Supposed to work great at expelling all air in the system through the MC resiviour. Spongy brakes suck! Anti-lock brakes suck even worse. I could have avoided $5000 damage to my Aerostar if I could skid. But Nooooooooooo.
I was born with nothing and still have most of it left.
I appreciate all your responses. You guys are a good group of guys. On a couple prior post, someone mentioned putting a very small drill bit into the holes. I was only intending to use a very fine wire guitar string. Would it be ok, to use the smallest bit available ? Or not because the holes are so small in diameter ? If I have to resort to taking the master cylinder apart. How is that done ? I've never looked hard at the mc, is there a c clip at one end and you simply remove it. Remove , piston and other internals. Clean them and simple as putting them back in. In the order they were removed. If so, what should I be mindful of ? I'm gonna mess around with it again tomorrow for the 4th time and I'll report what I found. If I can't resolve the problem tomorrow. I may just buy another mc. It's had to digest all of this as both mc I'm trying to get to work. Worked perfectly fine before. And what is the chance of 2 mc being clogged ?
I use a wire pulled from a wire brush to unclog the hole when it should happen to me , its small and stiff enough to push through a clog . This can be done with the master still together .
Hi,with the Master Cylinders you have to appreciate how old these things are now getting!!
Up to,& beyond 40 years plus!!?...for the sake of safety...either overhaul with a kit,or as you say buy a new Master Cylinder
Cheers,
Roger.
Suzuki GT750A
GT750Battleship wrote: Hi,with the Master Cylinders you have to appreciate how old these things are now getting!!
Up to,& beyond 40 years plus!!?...for the sake of safety...either overhaul with a kit,or as you say buy a new Master Cylinder
Cheers,
Roger.
Suzuki GT750A
You're exactly correct, Roger. It's just hard to except that 2 master cylinders are now defective. That both worked perfectly fine 5 or 6 months ago. If I can't fix the problem very soon. I'm going to buy this master cylinder to use temporarily. http://www.ebay.com/itm/271381350191?_t ... EBIDX%3AIT" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false; That will allow me time to rebuild or at least disassemble and clean both of my original master cylinders. I insist on keeping those and getting them to work properly as I want the original master cylinders on the bike. But, the link I posted will allow me time to ride and enjoy the bike. Appreciate, your help.
Last edited by pearljam724 on Wed Mar 26, 2014 10:17 pm, edited 1 time in total.
Suzukidave wrote:I use a wire pulled from a wire brush to unclog the hole when it should happen to me , its small and stiff enough to push through a clog . This can be done with the master still together .
Suzukidave wrote:I use a wire pulled from a wire brush to unclog the hole when it should happen to me , its small and stiff enough to push through a clog . This can be done with the master still together .
On mine the hole was to blocked to penetrade with wire from a wire brush. I HAD to drill it. If that is neccesary, remember to clean the onside of the master cylinder bore afterwards from leftowers and Sharp edges from the drilling, otherwise you risk destroying the piston seals.. As they say - just saying
Hi,with the Master Cylinders you have to appreciate how old these things are now getting!!
