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BK1

I cant get fluid to the calipers

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Posted (edited)

Hi I bought the bike last year its got loads of miles and bit tatty it needed  some tlc  the brakes where fine but the rear disc was worn and their was a slight play in the bearing so pulled the back wheel did the bearings and disc and noticed the pots looked crusty with salt and stuff so I pulled the caliper the seals where good and pots cleaned up well with a rag  I had to split the caliper to clean  replaced the brakes  next step changing the fluids  being linked brakes I  looked up the  bleeding sequence  removed the seat cowl  to fill the ress and cracked the front right centre  I got  some of the old fluid through then nothing I was using a vac and pumping the rear brake it just stopped so iI removed the nipple and found the hole was blocked i cleared it got few mils of fluid though the pipe then nothing again i checked the nipple it was clear.  Now here's the weird thing  it will let me pull about 1inch fluid from the ress  then no more im using a vac on the front right center the fluid lvl drops on the ress under the seat cowl  about 1inch  i keep trying for 1 hour and still cant get the fluid though so i pull the nipple the pessure drops out and a fluid lvl raises to the top again on the reservoir so i dont think anythings blocked I just cant get it to the caliper.

the fluid goes from the ress to the ms1 then pcv then ms2  then right front centre caliper I'm not shore if i need to service or bleed the m1 pcv ms2  until i get fluid to them if that possible        The front brakes are working fine I will be doing a service once i get the back sorted and I get to go for ride.

Any thoughts guys ?

 

 

Edited by BK1

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The blackbird linked brake system has more moving parts than you may realize. There is a proportioning valve, I think under the rear cowl. I say think because I never actually had to mess with mine. Anyway, likely blocked.  I hear this valve is  easily damaged, so be careful. Alternatively, you can delink the whole system with a delink kit, "jaws uk" has one. Personally, I would  keep the linked brakes, once sorted, they work very well. 

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3 minutes ago, fizzy said:

The blackbird linked brake system has more moving parts than you may realize. There is a proportioning valve, I think under the rear cowl. I say think because I never actually had to mess with mine. Anyway, likely blocked.  I hear this valve is  easily damaged, so be careful. Alternatively, you can delink the whole system with a delink kit, "jaws uk" has one. Personally, I would  keep the linked brakes, once sorted, they work very well. 

I will remove the proportioning valve next then and strip and clean  thanks for the tip 

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Fixed it cover the bleed nipple on the pcv stopping the air while bleeding the brake peddle pushes the fluid through to the front right center no need for the vac.  

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