Rear brake master cylinder wont take fluid.

  • Thread starter Thread starter jjlav
  • Start date Start date
J

jjlav

Guest
It has come time to change the hoses on the '83 Corsa. Front brakes a dream, they have come up hard and feel far much less spongy, at least in the garage.
The back brake is turning into a real problem. It has been weak and spongy for a while and I have now found the problem. The reservoir wont feed into the master cylinder. The plastic elbow into the cylinder is blocked. I have tried blowing out the obstruction (first by mouth down a pipe and then with compressed air)  but it is solid. I was hoping to get the bike to the Club Laverda QLD Concourse this weekend but that looks unlikely now.
Any suggestions,  possible causes and fixes?
Thanks
 
Have you tried poking the obstruction with a piece of wire or thin probe?
Are you sure that's the root cause?
Might be time to fit a new seal/piston kit to it too.
Or replace the whole unit with a new one.
 
Thanks ,I will try the right angle drill. I have one next to my striped paint and long wait. I hope its the right size!!!!!
Grant, I tried prodding with thing wire but it has the problem that it wont go around a tight corner. The cylinder has good pressure. it will push air hard against my finger and suck it down hard leaving a white circle on my finger. The elbow is blocked and I am thinking I will need a new grommet and elbow or what ever. The back brake has had little use because I thought it was just not very good and the engine has so much braking that I never needed to really user it hard, although at times it would have made life easier if it had worked better.
It looks like a kit or a new one unless someone has a better plan.
Thanks
JJ
 
I bought a new seal kit for mine and then on advice from Ralph at Motalia sent the mastercylinder and kit back to him for cleaning, honing and re-assembling...The labour charge was very reasonable..I think about ? 12.00.... The rear brake is perfect in operation.  Thank you Ralph !!

Joe
 
I wasn't being entirely flippant with the right-angle drill rubbish. Is it possible to poke a drill bit in from each end of the elbow and meet in the middle?

Twiddle the drill bit in your fingers rather than use a 1KW hammer drill if it's only a bit of muddy crap blocking the hole.
 
not so sure on yours but if its the same as a 180 the reservoir needs to be higher the factory bleed them of the bike then fitted them,not kidding was with clem at the closed factory and there was the little jig all rusting away,  ;)
 
Joe, I think you mean Ralph at Motalia and somehow I dont think you could even get through the door for twelve quid these days.


CLEM
 
You are right Clem..It was Ralph..I've never been any good with names ..Just about remember my own ha !

Well I bought the seal kit of Ralph and he suggested I send him the master cyl as they get contaminated inside with some kind of mould and that  clean it as you may it will need honing to ensure the longevity of the new seals.

He did charge me just ? 10.00 plus vat for the work and it was a very good job he did too.  Mind you I had bought practically half his stock which meant it must be half gone as everything was the last one on the shelf ; )

Joe
 
Thanks all, I was hoping not to have to take the cylinder off but have now done that so I will get a full kit and redo the whole lot.
Dellortoman, I see what you are saying. I think now that I have done the hard work of getting the cylinder off, once should be enough for a few years and a rebuild is better.
Now I understand what LAVERDA means.
   Little
   Assignments
   Very
   Easily
   Ruin
   Days
   Ahead  :(
It always seems to take less  time at Red's than when doing things totally by your self, but you learn a lot from your own mistakes. :D
Any recommendations of  who is good in Oz, especially around Brisbane area, at cleaning master cylinders?
Thanks
JJ
 
yea mate-just got 2 resleeved(stainless)and kitted at master cylinder exchange service in wynnum(near doug barton holden)120 bucks each-they even repainted them-where are you in brissy?
 
Thanks bevelman, will give them a lookup. I am out near Dayboro.
Cheers
JJ
 
You must log in or register to reply here.
Back
Top