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Old 09-17-2012, 07:20 AM   #1
Ivanvm OP
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Lost rear break pressure on ktm 525 exc

I took out my dirt bike out after a long summer break. As I started going down the hill I noticed I had no rear break. The break is there but pressing on the plunger causes no pressure on pads. Inspected the fluid level and it's fine. Lines are free of obstructions and undamaged. I am no mechanic but I can usually find my way around my bike but this one has me puzzled. Any ideas why the pressure is gone?
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Old 09-17-2012, 08:21 AM   #2
Marco Moto
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If the pedal is hard to push then your caliper piston is stuck, if the lever goes down with no pressure then your master cylinder needs to be rebuilt. Rebuild kits are available online for +- $30, good luck!
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Old 09-17-2012, 08:36 AM   #3
tutone
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Same

My 530 did the same thing last weekend and now in the shop for a Master cylinder rebuild. Actually I was told debris plugs some small venting hole. I trust my mechanic and he said this is common on KTMs
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Old 09-17-2012, 09:09 AM   #4
Ivanvm OP
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Thanks. Must be the master cylinder. Will get the kit.
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Old 09-17-2012, 11:24 AM   #5
dbarale
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Have you tried bleeding it first?
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Old 09-17-2012, 12:34 PM   #6
sailah
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Quote:
Originally Posted by dbarale View Post
Have you tried bleeding it first?
+1

Thats the first thing especially if it was working fine you probably just boiled the fluid, there isn't much in those master cylinders
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Old 09-17-2012, 04:22 PM   #7
Ivanvm OP
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Makes sense. Will get a pump and bleed the lines. Will report back in a couple of weeks (off to Cancun for 7 days). :) Rubbing it in...
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Old 09-18-2012, 04:09 AM   #8
Jacl-Kampuchea
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Happens me on my 450 all the time. I have to be careful not to be slightly weighing the lever with my boot or I boil the fluid and notice I have lost the rear at 70mph in sand

When it happens it cools down in 5 minutes and I can pump the pedal to bring pressure back up.
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Old 10-05-2012, 03:09 PM   #9
Ivanvm OP
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Finally I got a chance to bleed the break and it did the trick. The rear break now has pressure and seems to be working properly. I will try it tomorrow to see if it is working properly. Thanks for all your advice
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Old 10-05-2012, 07:37 PM   #10
elsalvadorklr
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your just boiling it so bleeding/flushing every once in a while helps...and not riding the brake too...
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