Main Menu

bout to make an ass of m'self...could my rear brake lock up...by itself?

Started by Rudemouthsky, September 24, 2012, 03:18:31 PM

Previous topic - Next topic
Print
Go Down Pages 1 2
User actions

ducpainter

#15
September 25, 2012, 06:10:05 AM
Quote from: zooom on September 25, 2012, 06:03:35 AM
assumption can be the the mother of all f**kups....sometimes...LOL
Yup...

but I know he has a free play issue...



;D
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


bigiain

#16
September 25, 2012, 06:13:42 AM
Quote from: brad black on September 25, 2012, 02:57:30 AM
ime any issue with the rear brakes dragging or locking it is always the freeplay being not, as it were.

I had it happen to me when the rod got all rusty inside the rubber boot. There was an ugly mixture of rust and water which turned into a paste in there.

So yeah, it was the piston being held in past the bypass port that locked the brake up, but it wasn't the freeplay in the rod assembly…

big

Rudemouthsky

#17
September 25, 2012, 09:08:18 AM
Caliper is new and came with new pads. On a sidenote, it is ridiculous that sellers on eBay are trying to get more for a crusty used caliper than a brand new one can be had for. Still have not had time to inspect the pushrod and take an exact measurement of freeplay. My redneck shadetree analysis is obviously not going to cut it here amongst you Ducati geeks, and rightfully so. Brakes are not to be f*cked around with, they're pretty important. I'm still suspecting an issue with the master though considering what a difficult time I had bleeding the line. Thanks for all these fast, quality replies.
"while there is a lower class, I am in it, and while there is a criminal element, I am of it, and while there is a soul in prison, I am not free." -Debs

ducatiz

#18
September 25, 2012, 09:10:42 AM
Quote from: Rudemouthsky on September 25, 2012, 09:08:18 AM
On a sidenote, it is ridiculous that sellers on eBay are trying to get more for a crusty used caliper than a brand new one can be had for.

Nah, what's ridiculous is that they actually will find buyers now and then.  I see used part prices range from a reasonable amount thru 1000% over.  The sellers on eBay Germany are the worst price-wise which may be due to local prices...
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

ducpainter

#19
September 25, 2012, 09:29:41 AM
Rear brakes can be difficult to bleed on a Monster particularly if the caliper is mounted on the bottom with the bleeder at the lowest point.

They bleed easily if you remove the caliper, put a block or wedge in between the pads and hold the bleeder above the master.

I'm betting you have a freeplay or piston return issue.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


H-2 CHARLIE

#20
September 25, 2012, 01:05:27 PM
  can the break slave be opened up and cleaned with the same seals ? if they dont leak from the get go ? or would they need to be changed and cleaned while its open ?

ducpainter

#21
September 25, 2012, 01:08:13 PM
What do you mean 'slave'?

There's a master cylinder and a caliper.

His caliper is brand new. I doubt it needs cleaning.

It isn't advised to disassemble brake units and not replace parts. You can't buy those parts.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


H-2 CHARLIE

#22
September 25, 2012, 01:24:31 PM
 i mean the rear master slave cylinder

ducpainter

#23
September 25, 2012, 01:26:14 PM
Quote from: H-2 CHARLIE on September 25, 2012, 01:24:31 PM
i mean the rear master slave
It can't be the master and the slave at the same time.

There are no parts available for the master. It wouldn't be advisable to disassemble it.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


ducatiz

#24
September 25, 2012, 01:53:59 PM
Replacement parts are not available for the later "small bolt" masters or for the later coffin masters, but you CAN disassemble them and examine the parts, clean and regrease, and rebuilt. 

The later units actually use a PLASTIC piston so be careful when removing everything.

Allied Metric can source the correct seals in EPDM.  I have refinished (not rebuilt) these using new seals from Allied.  Zero problems.

Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Howie

#25
September 25, 2012, 09:29:26 PM
Could a master slave be a self employed braking system?    :P

If there is proper free play and the caliper overheated badly enough the new caliper would be cooked.  Check that the pistons move freely.  After that, see if fluid returns to the reservoir after you release the brake lever.  If not, either there is still not enough free play or the compensating (return) port is blocked.  People have also overheated rear brakes enough to cook the master too. 

If I was Ducatiz, with a small fleet to support and always had something to ride I would mess with finding seals for the master and overhauling it.  Otherwise, for a little over 50 bucks you can get a brand new one from Yoyodyne.  Call Fred for proper fitment if you need one.

ducatiz

#26
September 26, 2012, 01:17:04 PM
Quote from: howie on September 25, 2012, 09:29:26 PM
Could a master slave be a self employed braking system?    :P

If there is proper free play and the
If I was Ducatiz, with a small fleet to support and always had something to ride I would mess with finding seals for the master....

Lol... if i have the order somewhere ill post the seal info for the adventurous
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Speeddog

#27
September 26, 2012, 03:49:20 PM
Quote from: ducpainter on September 25, 2012, 06:10:05 AM
Yup...

but I know he has a free play issue...

~~~SNIP~~~

;D

Yes, most likely.
Essentially impossible to bleed when the bleed port is blocked.
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

Rudemouthsky

#28
September 26, 2012, 04:48:48 PM
It was lack of freeplay. Negative freeplay, rather. The rod was actually slightly pushed in. *facepalm*
"while there is a lower class, I am in it, and while there is a criminal element, I am of it, and while there is a soul in prison, I am not free." -Debs

ducpainter

#29
September 26, 2012, 04:56:40 PM
Quote from: Rudemouthsky on September 26, 2012, 04:48:48 PM
It was lack of freeplay. Negative freeplay, rather. The rod was actually slightly pushed in. *facepalm*
Inexpensive fix... [thumbsup]
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Print
Go Up Pages 1 2
User actions