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rear brake problem

This is a discussion on rear brake problem within the Yamaha YFM660R Raptor (2001-2005) forums, part of the Performance /Technical category; I have a little problem with my rear brakes. I took my rear hose off the caliper in order to paint the caliper. When I ...


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Old 06-01-2003, 05:08 PM   #1
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Default rear brake problem

I have a little problem with my rear brakes. I took my rear hose off the caliper in order to paint the caliper. When I put the caliper back on and tried to bleed the brakes, I discovered that they would not hold pressure. I didn't get any junk in the caliper and there are no leaks. Any ideas on what the problem is?
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Old 06-01-2003, 05:27 PM   #2
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Is the pedal mushy? What was your bleeding procedure?
It's probably going to take a lot of pumping and bleeding, just like with sex.
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Old 06-01-2003, 05:33 PM   #3
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pedal just moved freely, i used the bleeding procedures in the repair manual. I was able to get the air out but it just doesnt hold pressure
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Old 06-01-2003, 06:10 PM   #4
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Quote: Originally Posted by screamin96
It's probably going to take a lot of pumping and bleeding, just like with sex.
LMAO, maybe prison sex!!
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Old 06-02-2003, 08:53 PM   #5
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sounds like I'm having the same problem, but I haven't touched my rear caliper, they seemed to have just quite all the sudden for no known reason. Tried bleeding them many times, and it still won't hold pressure. A friend told me I could have a bad seal in my master cylinder, but I don't know what else it could be.
Although, I did notice marks in my PRM skid where my brake lever had rubbed up against the skid, but the brake lever still goes all the way down.
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Old 06-02-2003, 09:12 PM   #6
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I'm kind of thinking your friend may be right about the master cylinder. I'll buy a rebuild kit and see what happens.
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Old 06-03-2003, 07:19 AM   #7
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Please let me know what you find out. I have the same problem. My brake pedal goes all the way down and hits my PRM frame skid. The parking brake also stopped working a while ago. I haven't taken any time to look at the problem yet, since I usually use the front brakes anyway. I just ordered a parking brake block off plate, so I'll probably look at everything real soon.
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Old 06-03-2003, 09:50 AM   #8
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LOL I was reading your post and said to myself "self, that sounds like your friend pez, with his brake hitting the PRM"

and it is.. LOL

how about this --->www.beaverdalehillclimb.com you wanna go??
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Old 06-03-2003, 11:15 AM   #9
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Default Re: rear brake problem

OK this may be totally off base but I also have a few streetbikes, and a friend of mien has a TLR and same thing happened to his. The rubber boot was pinched when he put it back in and it was allowing air in to the master cylinder preventing a good seal and allowing air into the lines when he attempted to use the rear brake.

I guess I would recommend you check to make sure the rubber boot is seated properly and that there are no tears or holes in it.

~A


Quote: Originally Posted by The Quadfather
I have a little problem with my rear brakes. I took my rear hose off the caliper in order to paint the caliper. When I put the caliper back on and tried to bleed the brakes, I discovered that they would not hold pressure. I didn't get any junk in the caliper and there are no leaks. Any ideas on what the problem is?
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Old 06-03-2003, 09:55 PM   #10
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Default SUCCESS!!!!

For anyone who cares, here it is. Assuming everything else in your rear brake system is good, this is what to do if you open your brake system or have the same problem i did. Open your bleeder screw, take off your master cylinder cap, and just keep pumping your brakes and refilling the resevoir until nothing but brake fluid squirts out. Then just close bleeder screw and magically your brakes will pump up and hold pressure. Thank you very much, have a good night.
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Old 06-03-2003, 10:45 PM   #11
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thx quadfather, I'll try that the first chance I get. Hopefully it will work for me as well.
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Old 06-04-2003, 10:54 AM   #12
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I had the exact same problem with mine and so did a friend of mine after about 15-20 rides. I've bled them at least 6 times but the pressure will not hold. Stainless line, new rotor and pads didn't help at all. Hmmm...
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Old 06-04-2003, 03:31 PM   #13
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fixed my rear brakes!!

Unfortunately I tried quadfather's method but it wouldn't work for my application. But my friend had a large syringe looking thing that a friend of his used for mixing his gas, he has a banshee. we screwed the zerk looking thing off the caliper. put the end of the syringe in its place and sucked lots of air out of my braking system. My brakes work great now, and it took no time to fix.
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