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dang rear brakes

626 Views 10 Replies 7 Participants Last post by  smokepole, 
S
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I've polised the pistons, put the new pads in, bleed the rear, bleed the front, back and forth 4 times. Nice clean fluid, no bubbles. Still feels like a big bubble and refuses to lock up the wheel, just slows the bike. Standing still, I can see the pedal bottoming on the floor boards (3 inches to boards from bottom of pedal). Assuming I can get me fingers wiggled into the knooks and crannys, how much ballooning am I expecting my finger to feel?????? Tried to pump them up and blow the hose open, no luck.
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Spondulas
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Sounds like you still have air in the system somewhere. Try tying a weight on the brake pedal and leave it there overnight. The constant pressure forces any air in the system to migrate to the master cylinder where it is harmless. Same idea works for hand brakes or hydraulic clutches.
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sandcastcb750
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Or, the brake hoses are no good?
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S
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Changed the pads while I had the bags off to do the bleeding, because it was spongy this spring. Still had an 1/8 inch left.
Will try the weight on the peddle tonight if I don't find a hose today. All else fails guess I'll do hoses anyhow. Then I'll bleed another 1/2 quart of fluid. I hate taking those bags off.
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S
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hands don't fit anywhere hoses are hiding
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oharaLTD
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brake hose may be expanding causing loss of stopping power. A hand held vacuum pump works well and there was a thread somewhere on here about using a spray bottle top.
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exavid
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I hate to bring this one up but if the small port in the rear master cylinder is plugged it will be nearly impossible to bleed the system. There are two ports between the reservoir and the master cylinder bore. One is around 1/8" or a bit smaller, the other looks like the same size hole but dead ended. It isn't dead ended, there's a very small hole in the bottom of the larger hole. I use a bristle from a fine wire brush to poke it out.
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left a weight on pedal all night,
Hmmmmmm, my hand can't collapse pedal to floorboard
when the rain quits I'll have to try a test ride.
"fingers crossed"
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rgbeard
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smokepole wrote:
left a weight on pedal all night,
Hmmmmmm, my hand can't collapse pedal to floorboard
when the rain quits I'll have to try a test ride.
"fingers crossed"
Click to expand...
What is this rain you speak of? Water fall from sky???
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GSMacLean
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smokepole wrote:
left a weight on pedal all night,
Hmmmmmm, my hand can't collapse pedal to floorboard
when the rain quits I'll have to try a test ride.
"fingers crossed"
Click to expand...
Yup...putting pressure in the system by putting a weight on the pedal (or belt/bungee around the brake lever) causes air bubbles in the system to be compressed. Because they are compressed (i.e. smaller), they will fit through orifices that they won't normally make it through, and can gradually (overnight) migrate their way up to the master cylinder, where they're expunged.
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S
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Should have reported back sooner. Rears seem to be working well currently, still seem a little spongy but well enough to lock em up. Will try to change out the hoses this winter.

Now to think about carbs, there's just a little popping when you roll back the gas. Last time they were done,?, 1993? when the mice chewed up the air filter, and all that filter jammed up the carbs.
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