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ALL OWNERS OF ALL SPYDER MODELS NEED TO CHECK THE CAPS ON YOUR BRAKE RESERVOIR

Rattigan_Roger said:
Okay my final word on this is I really don't care how you modify your brake system and master cylinder.
As long as you aren't anywhere near me on the road.

But your original post indicated that there was something defective about the original system and while you still, apparently, maintain there is, I think that anyone who takes your advice is doing so with enough warning that they should be considered forewarned.
Click to expand...

:agree: I'll also hang my hat on the capable engineers that designed the system! :thumbup:
 
I'm still mystified why the OP started a new thread only hours after another thread was started on the same topic.[emoji41]
 
ALL BRAKE SYSTEMS NEED TO BE VENTED I WAS WRONG

Rattigan_Roger said:
I keep hearing gasoline sloshing around in that big cavity under the seat.
I think I'll fill that sucker with cement.
I bet this is a problem for every Spyder out there.
Click to expand...

I have been doing alot of research, and I will stand corrected, that brakes systems do need to be vented. I have closed examined the old GM master cylinders from the 1960's and they were vented.
I now understand that a small hole is needed in the diaphragm that is in the caps on the brake reservoir. I, way back in a earlier post, said the Dorman #42081 diapragms had no vent hole in them. WRONG I WAS WRONG, they do have a tiny/tiny hole in them. Also, upon closer inspection, I have observed that the diaphragms that are in my 3-Spyders have a v-shaped slit in them, BUT, there is a tiny hole that has turned into a v-shaped slit. Did BRP put this V-shaped slit in them or has that tiny hole developed into the v-shaped slit? One of my original diaphragms did not have this v-shaped slit, but a pin hole like the new Dorman #42081. With this larger slit, I believe it allows more brake fluid to escape then as originally planned. I have replaced, in my 3 Spyders, the BRP diaphragms with the Dorman #42081 diaphragms that have a tiny/tiny hole that acts as a vent. To me, the Dorman diaphragms fit better than the original BRP diaphragms.
I do not know how the clutch master cylinder is vented, so will someone explain to me how they are vented.
I do not wish to panic fellow Spyder owners, it is my wish for all to be safe. I have a very mechanical mind, and like to know how everything works.

Tom n Carol, SI,NY
 
I had mine replaced due to te fact they were leaking and questioned the slits in the diaphragms
the purpose of splits are for the ABS brakes and need to be there, the older cars didn't have them from what I've read that is a requirements for ABS brakes
 
MISTERZ06 said:
I have been doing alot of research, and I will stand corrected, that brakes systems do need to be vented. I have closed examined the old GM master cylinders from the 1960's and they were vented.
I now understand that a small hole is needed in the diaphragm that is in the caps on the brake reservoir. I, way back in a earlier post, said the Dorman #42081 diapragms had no vent hole in them. WRONG I WAS WRONG, they do have a tiny/tiny hole in them. Also, upon closer inspection, I have observed that the diaphragms that are in my 3-Spyders have a v-shaped slit in them, BUT, there is a tiny hole that has turned into a v-shaped slit. Did BRP put this V-shaped slit in them or has that tiny hole developed into the v-shaped slit? One of my original diaphragms did not have this v-shaped slit, but a pin hole like the new Dorman #42081. With this larger slit, I believe it allows more brake fluid to escape then as originally planned. I have replaced, in my 3 Spyders, the BRP diaphragms with the Dorman #42081 diaphragms that have a tiny/tiny hole that acts as a vent. To me, the Dorman diaphragms fit better than the original BRP diaphragms.
I do not know how the clutch master cylinder is vented, so will someone explain to me how they are vented.
I do not wish to panic fellow Spyder owners, it is my wish for all to be safe. I have a very mechanical mind, and like to know how everything works.

Tom n Carol, SI,NY
Click to expand...

Hey stuff happens. I was wrong once, well maybe more than once. :roflblack::roflblack: I think some were a little hard on you because we have been down this road before on exactly the same topic, with same opinions on both sides, with the same results. On the good side this may have been educational to the newer spyderlovers that were not around when this was battled out before.
 
limp home message/ brake failure/ brake light dont know what to do please help

​
MISTERZ06 said:
This concerns all models of Can-Am Spyders: 2008-2014 GS/RS/ST/STS/RT/RSS/RTS AND WITH ANY TRANSMISSION: SM5/SE5/SM6/SE6

All these models have the same Caps and Diaphragms (BRP Part#219800058) that fit on the Brake Fluid Reservoirs. All Spyders and Models 2008-2012 had the Brake Fluid Reservoir BRP Part#705600735 or 705600549, and all Models 2013-2014 had Brake Reservoir BRP Part#705601072. Even though there was a change in 2013 of the Brake Reservoir, all the Caps and Diaphragms are the same BRP PART#219800058. I have three (3) Spyders. Two (2) are 2009 RS SM5's and one is a 2011 RT SM5. I have discovered that on my 2-RS's, that all four (4) Diaphragms in the Brake Reservoir Caps, had identical tears in them, v shaped. On the 2011 RT, only one of the Diaphragms had that v shaped tear in it, and the other had no tear in it. On one of the Rs's and the RT, brake pad replacements were done, and the Caps were removed while compressing the calipher pistons. The reasoning as to why you remove the Brake Reservoir Caps is that when you are collapsing the pistons, the brake fluid is filling up the reservoir and can cause pressure against the Diaphragm, with no place to go. This could cause a tear, BUT, on my other RS, which has never had a brake replacement done, there are that v shaped tear in both Diaphragms.

That tear in the diaphragm could cause brake fluid leaking down the top of the reservoir and down the inside of the Spyder and landing on the top of the rear Shock mount. In the past I have noticed brake fluid seepage causing paint to peel, BUT, to this time, I could not find the cause. WELL NOW I HAVE! IT IS TEARS IN THE DIAPHRAGMS
This is caused by what? Inferior manufacturing, Bad Rubber, ? Maybe the brake fluid runs so fast back into the Reservoir when you release the brake pedal, that the diaphragm can not hold the pressure? BRP needs to slow down the speed of brake fluid returning to the reservoir with a residual valve? VIOLA A TEAR

I HAVE FOUND, I HOPE, A BETTER REPLACEMENT OF THE DIAPHRAGM

DORMAN HELP! PART# 42081 Master cylinder gaskets These should be availabe at a good auto parts store. These dorman diaphragms look/feel alittle heavier/stronger. When I installed them, I can feel that are making a better seal , I had a harder resistance when tightening the caps.

PHOTOS TO FOLLOW: BRP-WITH V-SHAPED TEARS N New DORMAN diaphragms

Tom n Carol, SI,NY
Click to expand...

Dear Tom my bike is giving me the fits i get a brake failure light, then limp home message then it dies and i dot know what to do do u have any ideas
 
Gwen,
It might just be a case of your brake fluid levels, being a bit low...
These bikes are VERY fussy about this, and it seems that they start complaining, if they're about six drops short... nojoke


Oh!! :welcome: :D
 
Bob Denman said:
:shocked: Is it just me, or did the original poster sound just like those Lawyers' ads on T.V.; trying to find somebody who didn't get better? :shocked:
Click to expand...

Sounded to me like he sincerely thought he had found a potential problem and went to a lot of trouble looking up part numbers and detailing potential fix's. I never had a leak, but also didn't know the caps were made with a "v" to vent. So I learned something today, thanks to this current thread. :)
 
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