Lost all pressure on break?

RobertTrivanovic

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Abbotsford BC

• Dec 14, 2014

• #1

So going down the trail i suddenly had no breaks on my 2007 m8, later that day i got stuck with my front end a lot higher then the back and the break came back completely from sitting like that for awhile, then i get back on flat ground and 5 minutes later no breaks again.

What could be the issue? I have plenty of break fluid in it, only thing i can think of i a air bubble but i dont know how that would of magically showed up since i havnt touched anything in that area?

 

kidwoo

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• Dec 14, 2014

• #2

It does sound like an air bubble. If you haven't messed with the brake then it's probably from a breach in the system somewhere. I'd follow the whole thing from caliper/reservoir, the brake line, down the caliper. If there's a hole in there that will easily get a bubble going.

Bleed it regardless.

 

av8er

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• Dec 14, 2014

• #3

do a track swap recently??

sounds like you need to bleed your brakes.

 

RobertTrivanovic

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• Dec 14, 2014

• #4

No track swap. Curious what would that have to do with the breaks?

Yeah i guess i just need to bleed them and make sure theres no holes in my line or anything like that, really just curious how i could of got a air bubble in it without touching it and having enough fluid

 

kidwoo

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• Dec 14, 2014

• #5

RobertTrivanovic said:

No track swap. Curious what would that have to do with the breaks?

Yeah i guess i just need to bleed them and make sure theres no holes in my line or anything like that, really just curious how i could of got a air bubble in it without touching it and having enough fluid

Click to expand...

Moving the caliper around to deal with the brake/rotor/driver shaft could either knock loose a bubble that was hanging out in the caliper or cause damage to the line if you pinch it.

Throw your e-brake on overnight. See if feels weird like you need to pump it up when you release in in the morning. If so you've got a good amount of air in there. Look really closely along the line when you check it out. It doesn't take much of a hole to leak or introduce air. Sometimes rubbing it with a paper towel will show you if you have any fluid on the outside of the brake line.

 

av8er

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• Dec 15, 2014

• #6

track swap

you disassemble your brakes to get the track swap done.

 

Vern

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hyrum utah

• Dec 15, 2014

• #7

Buddy had a similar issue on his m7, brakes would work one minute then stop then come back again. I believe his caliper was hanging up or something, I can't remember if he rebuilt it or just tore it apart and cleaned it but its been fine ever since he took it apart.

 

K

kingkat1150

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belgrade mt

• Dec 15, 2014

• #8

no break

My buddies 07 M8 did that two seasons ago. We found that the pistons in the caliper were stuck. I was able to free them by taking the pads out and gently pushing on the pistons with a pry bar and squeezing the break lever to move them back and forth. they work great now and has instant breaks .