SOHC.co.uk Forums > CB750

TROUBLE BLEEDING FRONT BRAKE

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McCabe-Thiele (Ted):
On most of my cars I've used a Lockheed Easybleed (LE) using air from a spare wheel to power it. I've always got a decent pedal by this method. I also like the look of the one Ed China uses that sucks fluid out of the bleed nipple.

Later design master cylinders often can't work with LE. I might source a suction type for future use.

K2-K6:
Are you confident the internal routing from master cylinder pot into the piston are scrupulously clean, also not compromised for diameter ( part blocked) ?

It sounds,  if all the air is out of system, that the fluid may not be filling the piston void competently.  This could result in the increase in travel you are getting.

Try this, ( not bleeding but with it fully operational) hold the bar with left hand and wack the lever in very quick succession quite forcefully,  about six times but holding the last push, does the level stop further out with that last push? In old fashioned terms  :) does it improve pressure and "pump up".

philward:
I had terrible trouble bleeding my K2 when I built it - tried everything but turned out to be a blocked hole in the master cylinder - there's 2 holes, one smaller than the other. When I completely cleared the smaller one, it bled 1st time. Just done same on a K6 I've built and it too bled 1st time. From memory, it was 1mm and cleaned out with 1mm drill

Gromitdog:
Hi All

Thank you all for coming up with good points on what may be causing the problem in bleeding my brakes I think i will start with the couple of different ways to bleed the system that have been suggested ie side stand and easy bleed then if no joy I am going to strip down the master cylinder and check the seals etc. And go through the setup again just cant believe how difficult it is to bled  >:( >:(     such a small system

Trigger:
I can't understand why so many people have trouble bleeding the system. If the M/C is clean and the new kit assembled correctly, the caliper totally cleaned it, should bleed straight away.

If not then there is something wrong.

You can not compare to other systems by the lever travel. I have one 750 that the lever only comes back half a inch and the pads are locked on the disk, another 750 the lever travels a lot more before the brake is locked on. Though they have both the same system and new parts fitted. In the trade we call this " the characteristic of the vehicle    ;)

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