Brake Fade....Comes and goes...

Rev Kev · Apr 2, 2013

Started to happen last few rides, here is a short history of my sled, 2011 Pro RMK, 2200 Miles, Fresh DOT4 Fluid at the start of this season. On the last few rides this season, I have run into a situation where I have No brakes, the lever goes right to the bars, pump it up real quick, and they return. May last for a few hours, then it happens again. Fluid is full, and still clean. Sled can sit for weeks and the brakes are fine. Has me baffeled. This off season I may look into cleaning both the Master Cylinder and Caliper, and filling with fresh Fluid. Has anyone had a simular experience, and what was your remedy? Thanks.

Robbie · Apr 2, 2013

Brake Fade

It sounds to me like your brake disk is warped or the center is sloppy. Something is pushing the brake pucks out farther that one pump on the brake handle can handle. That is why you have brakes after two or more pumps. The pucks are moved back into positon.

CROW · Oct 6, 2013

Kevin,

I had a similar issue on my RMK and it turned out to be a bad caliper.

sledhead_79 · Oct 6, 2013

Air in brake line? Did you bleed air out when you put the fresh brake fluid in?

m8magicandmystery · Oct 6, 2013

if there is no lose of fluid it can really only be two things other then air..

rotor warped like mentioned above...or plunger cups on piston...
caliper issues usually are brakes not releasing..

LoudHandle · Oct 6, 2013

Brake drag can cause the fluid to boil and the symptoms are similar to having air in the system. That is my best guess as to why it is fine when cold or after sitting for weeks. After riding it builds enough heat from brake drag to boil some vapors out of the fluid inside the caliper. As those vapors expand it drags worse. When you pump it a few times you force the vapors back into the fluid and get brakes again. It is my belief that is why there are multiple part numbers for the calipers, Polaris was trying to get a handle on the cause and the cure for this phenomenon.

Rev Kev · Oct 7, 2013

Found the Culprit, the brake line, where it goes past the steering post, and upper Support, rubbed through one of the wire harness' feeding to the Grip warmers, and shorted out, melting the plastic covering off the Brake Line, thus boiling the fluid in the line, causing the fade, and now explaining my dim headlite and lack of grip warmers at times.

RoffRider · Oct 7, 2013

ive had the same issue...turns out to be the oil pressure popped the brake light sensor thing and then it leaked all the fluid on the chaincase

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Brake Fade....Comes and goes...

Rev Kev

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Robbie

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CROW

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sledhead_79

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m8magicandmystery

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LoudHandle

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Rev Kev

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RoffRider

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