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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: dawidski on June 08, 2018, 11:09:22 AM

Title: Front brake no pressure.
Post by: dawidski on June 08, 2018, 11:09:22 AM

I have a 85 k100rs. I took the wheels off last weekend for new tires.  Accidentally hit the brake lever and I locked the brake pads together.  After not getting them apart I opened up the bleeder quickly to relieve some pressure figuring I can easily bleed the brakes. Got them apart and pushed back.  Wheel back on.   
Now I have zero pressure in the lever. I've tried all the methods of bleeding I could think of.   The Mc never went dry and I can't find any leaks anywhere.  [size=78%]  [/size]


Any advice would be appreciated. 


Thanks
-Dawid

Title: Re: Front brake no pressure.
Post by: Chaos on June 08, 2018, 11:14:02 AM

if the pistons went back in properly you may just need to pump the lever a couple dozen times to move the pads up against the rotor again. 

Title: Re: Front brake no pressure.
Post by: Laitch on June 08, 2018, 11:47:03 AM

Quote from: dawidski on June 08, 2018, 11:09:22 AM

II've tried all the methods of bleeding I could think of.

Welcome, dawidski. That statement doesn't tell us much of anything. Exactly what did you try?

Title: Re: Front brake no pressure.
Post by: bizzaro on June 09, 2018, 08:12:09 AM

What Chaos said.


 I just changed out my tires and wedged my pads apart with a wooden wedge.  The movement in pads is generally very small, so if the pistons are backed out a good bit, it takes a bunch of pumps to get contact again. Just make sure you don't diminish your fluid level to the point where it is sucking in air, which shouldn't be a problem, because you had enough fluid in there befor the work........it doesn't just evaporate.

Title: Re: Front brake no pressure.
Post by: johnny on June 09, 2018, 09:01:28 AM

greetings...

did you pull the lever hard against the grip...

j o

Title: Re: Front brake no pressure.
Post by: Motorhobo on June 18, 2018, 11:25:38 AM

Quote from: Motorhobo on November 20, 2013, 08:24:50 PM

Maybe this will help -- maybe not, but my buddy, ex-BMW mechanic and K-bike guru Mike told me that a tiny bit of air will stay trapped in the MC unless you do this:

1) Push the pads all the way out with a screwdriver to retract the pistons allt he way then bleed the lines using vacuum or gravity
2) Leaving the cover off the MC, turn the bars full left
3) Pump 1/4 lever very slowly several times, watching for the trapped bubbles to escape.
4) Turn the bars full right, slow-pump 1/4 lever several times and watch
Repeat until no more bubbles appear.

I always had trouble getting pressure after bleeding until I started doing this. After doing this it always takes many pumps for pressure to move the piston out to engage the pad with the disk, especially if the pad is worn at all.