Front brakes!!! ARRRRGH! - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 14 (permalink) Old 09-20-2016, 07:17 PM Thread Starter
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Front brakes!!! ARRRRGH!

I have been riding my 2004 750 Aero all summer with a brake handle that I can pull to the grip. I changed my brake fluid last year. I never got the pressure back. I have bled traditionally, I bought a reverse bleeder, I bought a speed bleeder, I have tried a vacuum bleeder, I have bled the banjo bolt at the MC, I bought a kit and rebuilt the MC. What am I missing here? Never in my 38 years of riding have I ever not been able to bleed a brake line. Is there a secret to the Aeros that I don't know?


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post #2 of 14 (permalink) Old 09-20-2016, 07:34 PM
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Maybe the issue is in the master cylinder and not the bleeding?


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post #3 of 14 (permalink) Old 09-20-2016, 08:33 PM Thread Starter
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I rebuilt it with that in mind, but it made no difference


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post #4 of 14 (permalink) Old 09-20-2016, 08:42 PM
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are the slides and piston moving freely on the brake caliper?

what state is the hose in, time for a braided line?


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post #5 of 14 (permalink) Old 09-20-2016, 09:51 PM
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Is there more than one banjo bolt connection than at the mc and caliper? If there is, you may want to bleed from there as well. It may go without saying, but double check you put the right fluid in. I have accidentally grabbed the wrong bottle before, thankfully realized it before pouring.

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post #6 of 14 (permalink) Old 09-21-2016, 06:54 AM
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I`m still thinking on this...



Pads?Are they in good shape?
Pistons moving freely in the caliper?
Are they clean and lubricated?
Operating correctly?
What about the rotor?


Point??
There are other parts to the brakes system to check too...
I might suspect hoses next..
Are they in good shape?
You mention you rebuilt the master cylinder, is it functioning correctly?


Dunno what the deal is here?
Bring it over, you & I will figure it out,
D

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post #7 of 14 (permalink) Old 09-21-2016, 09:46 AM
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Sounds like you've covered all the likely spots where air could be trapped.

Your problem is likely with the master cylinder. Likely will have to be rebuilt again. Don't know if the bore is bad but if so you might have to hone it.

Three things tend to happen with master cylinders on older bikes. The small hole in the bottom of the master cylinder gets plugged, the piston in the MC gets overtravelled and damages the rubber seal at the front of the piston, and the piston in the caliper sticks.

My gues is that you've overtravelled the MC piston. So get another kit, tape a 1/2" socket on the handlebar, between the throtle grip and the brake lever ( this prevents the lever from going right to the grip which damages the seal on the piston ). Install the kit, fill the reservoir with proper brake fluid, install new crush washers at all banjo bolts ( if they've been disturbed ). Don't touch the front brake lever. Bleed at bleed valve at caliper, using a vacuum bleeder ( sounds like you have one ). Once you get all the air out of the system, then go to the front brake lever and see if you have pressure. Hold a rag over the master cylinder, and look for a squirt of brake fluid when you pull the lever, that tells you that the small bleed hole in the MC is working properly. Or just go ahead and put a known good MC on the bike. Sometimes that ends up being the onkly thing that works. That's what I ended doing in one case that I couldn't get the old MC to work properly.
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post #8 of 14 (permalink) Old 09-26-2016, 06:42 PM Thread Starter
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Quote:
Originally Posted by "Captain D" View Post
Pads?Are they in good shape?
Pistons moving freely in the caliper?
Are they clean and lubricated?

Pads are good. Bike is never ridden in the rain, and obviously not in the winter, so no road salt to eat things up like a car. I never thought to check the pistons, but because I had all kinds of brakes prior to the fluid change,I would have to say they're fine.

Someone else mentioned the proper fluid. I used DOT 4 Synthetic.



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post #9 of 14 (permalink) Old 09-26-2016, 06:55 PM
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Quote:
Originally Posted by feetr2c View Post
Pads are good. Bike is never ridden in the rain, and obviously not in the winter, so no road salt to eat things up like a car. I never thought to check the pistons, but because I had all kinds of brakes prior to the fluid change,I would have to say they're fine.

Someone else mentioned the proper fluid. I used DOT 4 Synthetic.



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Many times with cars I've seen perfectly functional calipers have the pistons get stuck when bleeding, as the process brought all the skunky fluid and contamination through the system where a chunk of crud lodged between the piston and the caliper bore. Happened a couple times on my own car which has six piston dual bleeder fronts which drive me insane.

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post #10 of 14 (permalink) Old 09-27-2016, 12:16 PM Thread Starter
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I will look into that...can the piston be taken out for cleaning and flushing of the caliper? Also....if I put on new pads (originals have 18k) do bike pads come with those thin little stainless clippy things like cars have?


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