1993 cbr1000f rear brakes
#1
#2
When you say "the rear brakes don't work at all" does the pedal feel normal (like it's making pressure)? If the bike hasn't been used for ages maybe the pistons in the rear calipers have stuck. Could be the rear master cylinder is stuffed too. I'd start by flushing the brake system with new fluid and bleeding then go from there. Then you'll be able to see if the master is pumping properly. Next would be to pull the back caliper off and go in. There's a manual to download on this site which will tell you the ridiculously complicated bleeding procedure for the linked system.
imo the linked system sucks and I had mine split. I couldn't drag the back brake around small roundabouts or slow riding without the front brake coming on suddenly and the front trying to tuck in under me.
imo the linked system sucks and I had mine split. I couldn't drag the back brake around small roundabouts or slow riding without the front brake coming on suddenly and the front trying to tuck in under me.
#3
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#6
Malbojah is another resident expert, as is Dean0.
If Ronnie can't help (Hi Ronnie) I'm sure that one of them will. There's also a how to on it I think....
This I know, that there's a specific sequence to bleeding the brakes on linked brakes.
If you need a manual, check the manual section.
If Ronnie can't help (Hi Ronnie) I'm sure that one of them will. There's also a how to on it I think....
This I know, that there's a specific sequence to bleeding the brakes on linked brakes.
If you need a manual, check the manual section.
#7
In that case I'd say you've got a heap of air in the system or the rear master is cactus. In any case you'll have to start with a bleed to be able to see what's going on. Good idea to change your fluid anyway, if you don't know the last time it was changed, as brake fluid takes up moisture from the air and looses it's properties. That's not your main prob though since you've got no pressure at all. Good luck mate.
#8
Any idea how long it's been sitting?
Personally I'd just get the calliper off and see if the pistons move at all when you press the brake pedal. If you've got nothing you may need to at least give them a squirt of WD40 and try pushing the pistons back in to free them up. Even if you had pure water in the system they should still move a bit.
If they're really stuck then a new (second hand) calliper is probably going to be your answer.
As everyone else says, you really need to study the linked brake system to understand it. It's a whole appendix on its own but don't be disheartened, it'll make excellent bed time reading..... he he!
Good luck.
Personally I'd just get the calliper off and see if the pistons move at all when you press the brake pedal. If you've got nothing you may need to at least give them a squirt of WD40 and try pushing the pistons back in to free them up. Even if you had pure water in the system they should still move a bit.
If they're really stuck then a new (second hand) calliper is probably going to be your answer.
As everyone else says, you really need to study the linked brake system to understand it. It's a whole appendix on its own but don't be disheartened, it'll make excellent bed time reading..... he he!
Good luck.
#10
The textbook method for bleeding the cbs system is as follows
The front brakes on a cbs system are just like any other non cbs bike - direct link between master cylinder and calipers.
Ensure the FRONT master cylinder is full and does NOT run dry :
Bleed the RIGHT OUTER nipple.
Then bleed the LEFT OUTER nipple.
Ensure the REAR master cylinder is full and does NOT run dry :
Bleed the FRONT RIGHT CENTRE nipple. (this will take a while as this is the main line!!)
Bleed the FRONT LEFT CENTRE nipple.
Bleed the BACK CENTRE nipple
Bleed the BACK OUTER nipple
DO NOT let either master cylinder run dry or your back to square one.
A vaccum bleeder is the best system
Speed Bleeders come a close second
You - a mate and a six pack is the most enjoyable way - haha
The front brakes on a cbs system are just like any other non cbs bike - direct link between master cylinder and calipers.
Ensure the FRONT master cylinder is full and does NOT run dry :
Bleed the RIGHT OUTER nipple.
Then bleed the LEFT OUTER nipple.
Ensure the REAR master cylinder is full and does NOT run dry :
Bleed the FRONT RIGHT CENTRE nipple. (this will take a while as this is the main line!!)
Bleed the FRONT LEFT CENTRE nipple.
Bleed the BACK CENTRE nipple
Bleed the BACK OUTER nipple
DO NOT let either master cylinder run dry or your back to square one.
A vaccum bleeder is the best system
Speed Bleeders come a close second
You - a mate and a six pack is the most enjoyable way - haha
Last edited by Dean0; 03-16-2010 at 07:58 AM.