SOHC.co.uk Forums > CB650

front brakes

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pae:
I seem to recall my previous 650 never had a great feel on the lever. Will let you know what the MOT tester makes of it.

Phil

fisjon:
Hot tip for bleeding brakes after refitting pistons and seals!

Half fill resevoir and GENTLY pump fluid into system topping up as you go until it is obvious no more fluid required.

IMPORTANT Do not force the lever at any time as this will compress the air into the fluid, yes brake fluid will suck in air and it will become elastic.

Leave overnight. The weight of the fluid will want to go down and the air will want to come up. In the morning the air will be at the top of the system, and by GENTLY moving the brake lever in and out WITHOUT APPLYING FORCE you will see lots of bubbles rising into the resevoir. Do this for several minutes until the air bubbles stop rising. Leave for 15 minutes and then gently move the lever again to see if there is any more air. Repeat if necessary until no more bubbles.
  
The important thing about this process is not to apply pressure on the lever until the system has no air in it or you will compress the air into the fluid and this will give you a spongy lever.

Also you should avoid leaving the cap off the resevoir for long periods as air will ingress into the fluid merely under atmospheric pressure.

This method requires a little patience but beats the s--t out of spilling fluid over your nice clean bike!

My CB650Z front brake does have braded hoses but having used the above system the lever is solid and moves very little to provide good braking.

Oh! One more thing, always use new fluid, if it has been in a can that has been opened for some time  it is usless.

florence:
You may find it will improve given a little time, once the new pads have bedded in.  If you think about it, they will not be perfectly parallel until they have worn a little to the disk and this will contribute to brake 'feel'.  Also, as has been suggested, braided hoses make a good deal of difference, I have them on my CB500/4 and would never go back to the old kind.

I do not think you will ever completely eliminate that slight sponginess but it should only be very slight.

judodave:
thanks for all the reply's, just to update you all the front brake sorted itself out over a period of time and have been using the bike regularly up until this recent change of weather. many thanks again.

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