Billman's Brake Fluid Gravity bleeding revised
01-01-2013, 07:01 PM
#41
This is what I thought.
But my buddy who is a mechanic and s2000 guru told me s2000 rear caliper is screw type and screws out when pulling the ebrake...I don't understand what that means at all.
But my buddy who is a mechanic and s2000 guru told me s2000 rear caliper is screw type and screws out when pulling the ebrake...I don't understand what that means at all.
01-02-2013, 04:25 AM
#42
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IIRC the handbrake cable actuates the hydraulic piston in the rear caliper, so it's not completely independent of the hydraulic system, but that's not going to matter unless you want to push the pistons back in all 4 calipers, which shouldn't be necessary.
01-02-2013, 05:12 PM
#43
thanks for the answer. I think this is what my buddy meant too. he said it shouldn't be really matter if the ebrake is up or down but theoretically speaking the ebrake should be released. i will just make sure next time i do it i set it down.
01-02-2013, 05:44 PM
#44
Registered User
Yes, I hope that it's obvious that they share the same set of rear pistons. If you want to change your rear pads or discs, or remove the calipers, you'll need to release the handbrake otherwise the caliper will be locked on to the disc.
01-02-2013, 08:54 PM
#45
On a technical level, I disagree with #3.
I'm not sure to what level does Billman mean by keeping it full. I top it off after each wheel.
The difference between half-full or full is insignificant. The pressure driving the through the brake lines is a function of the density and the difference in height between the bleeder and the level of the fluid in the reservoir. I estimate that this is about 17", and the difference between constantly keeping the reservoir full is about 1", making it about a 6% difference in pressure. As a result, how full the reservoir has almost no effect on the speed at which fluid will flow.
I'm not sure to what level does Billman mean by keeping it full. I top it off after each wheel.
The difference between half-full or full is insignificant. The pressure driving the through the brake lines is a function of the density and the difference in height between the bleeder and the level of the fluid in the reservoir. I estimate that this is about 17", and the difference between constantly keeping the reservoir full is about 1", making it about a 6% difference in pressure. As a result, how full the reservoir has almost no effect on the speed at which fluid will flow.
01-02-2013, 09:06 PM
#46
Billman,
Do you know anything about getting the fluid out of the ABS system? I have not heard anything conclusive about if that fluid is "mixed" with the fluid in the regular lines, and if so, does it only mix when the ABS is activated. And, if it's mixed, is it good enough to activate the ABS a few times to mix it before bleeding? Or do you need to use Honda's computer system to do it?
Do you know anything about getting the fluid out of the ABS system? I have not heard anything conclusive about if that fluid is "mixed" with the fluid in the regular lines, and if so, does it only mix when the ABS is activated. And, if it's mixed, is it good enough to activate the ABS a few times to mix it before bleeding? Or do you need to use Honda's computer system to do it?
01-03-2013, 08:28 AM
#47
Registered User
Originally Posted by dwight' timestamp='1355686145' post='22213762
On a technical level, I disagree with #3.
I'm not sure to what level does Billman mean by keeping it full. I top it off after each wheel.
The difference between half-full or full is insignificant. The pressure driving the through the brake lines is a function of the density and the difference in height between the bleeder and the level of the fluid in the reservoir. I estimate that this is about 17", and the difference between constantly keeping the reservoir full is about 1", making it about a 6% difference in pressure. As a result, how full the reservoir has almost no effect on the speed at which fluid will flow.
I'm not sure to what level does Billman mean by keeping it full. I top it off after each wheel.
The difference between half-full or full is insignificant. The pressure driving the through the brake lines is a function of the density and the difference in height between the bleeder and the level of the fluid in the reservoir. I estimate that this is about 17", and the difference between constantly keeping the reservoir full is about 1", making it about a 6% difference in pressure. As a result, how full the reservoir has almost no effect on the speed at which fluid will flow.
01-03-2013, 01:32 PM
#48
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You do not need hydraulic fluid to operate the handbrake, it's all mechanical.
IOW, even with no fluid in the system at all the handbrake would still work.
The handbrake cable turns a lever that pushes a small rod that pushes the bottom piston (or flange) pushing the threaded rod (the automatic pad wear adjuster) in a nut in the centre of the main piston.
The threaded rod is the reason you have to turn the rear main piston back in and the reason the rear piston has those grooves that need to line up with the pin on the pad to stop it from turning.
When you brake with the pedal the hydraulic fluid pushes the rear piston out, but leaves the flange at the bottom of the caliper bore.
The threaded rod is springloaded and will turn to make up any play caused by pad wear, just like the springloaded central screw in the TCT.
If you know what I mean.
If my friends at Webshots would not have turned into a payed "service" I would have been able to post pictures.
Oh well...
edit: typo
01-04-2013, 05:28 AM
#49
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Originally Posted by Sellout' timestamp='1357133133' post='22240691
IIRC the handbrake cable actuates the hydraulic piston in the rear caliper, so it's not completely independent of the hydraulic system, but that's not going to matter unless you want to push the pistons back in all 4 calipers, which shouldn't be necessary.
You do not need hydraulic fluid to operate the handbrake, it's all mechanical.
IOW, even with no fluid in the system at all the handbrake would still work.
The handbrake cable turns a lever that pushes a small rod that pushes the bottom piston (or flange) pushing the threaded rod (the automatic pad wear adjuster) in a nut in the centre of the main piston.
The threaded rod is the reason you have to turn the rear main piston back in and the reason the rear piston has those grooves that need to line up with the pin on the pad to stop it from turning.
When you brake with the pedal the hydraulic fluid pushes the rear piston out, but leaves the flange at the bottom of the caliper bore.
The threaded rod is springloaded and will turn to make up any play caused by pad wear, just like the springloaded central screw in the TCT.
If you know what I mean.
If my friends at Webshots would not have turned into a payed "service" I would have been able to post pictures.
Oh well...
edit: typo
I had hoped to convey that the handbrake actuates the same piston that the hydraulic system does, which isn't the case in some vehicles, not that the handbrake was dependent on the brake fluid. I think this is what his mechanic friend was getting at, when he said
But my buddy who is a mechanic and s2000 guru told me s2000 rear caliper is screw type and screws out when pulling the ebrake...I don't understand what that means at all.
