Front brake sound (howling) - Honda Rebel Forum
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post #1 of 16 Old 04-12-2019, 05:15 PM Thread Starter
 
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Front brake sound (howling)

Hello,
i undestrand, that this wont be easy to identify, but maybe somebody can help me understanding the cause of howling front brakes. (Rebel 450 87')
It appeared after few rides after changing brake pads to new ones. Thought that it could be brakes or front axle or bearings.
Driving on the road it dissapears only if i press the brake handle slightly. After stoping it howls even on pushing the bike forward. Going backwards it gives no sound.
I suspect, that the new wider brake pads just don't release the brake disc enougth.
Tryed to reassebmle ant clean the brake calipers and cylinders. Found that the inside caliper metal plate small teeth, that keep the bottom of outer brake pad were bend. So the outer caliper could be a little loose and after braking just being stuck in slightly angled possition, for the sound to appear.
Bend them back, but the sound is still there.
Actually it was hard to mount the brake caliper back. It is made of two parts - one monting element at the fork, and the caliper itself. They are connected by two bolds with rubber spacers. Is it kind of caliper depth regulator? as on other models i see it is moving freely in that place.
Maybe because of it caliper stays a little bit angled to the brake disk, thats where the sound comes from? Can caliper be adjusted regarding brake pads wear, or it adjusts itself?
And also i was able to push cylinders back inside caliper only with lots of preasure on them. Should it be this way?
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post #2 of 16 Old 04-12-2019, 06:00 PM
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you should take that all back apart and make sure the calipers move freely and adjusters are full range

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post #3 of 16 Old 04-13-2019, 01:28 AM Thread Starter
 
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Thats the sound of bront brake howling even on slight move. The front brake is warm after 9km (5miles) drive.
(poor video, but thats the sound that matters).
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post #4 of 16 Old 04-13-2019, 07:39 AM
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i think you're right about where the noise is coming from - pads rubbing on disk - you've got a slight warp too but that should be ok

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post #5 of 16 Old 04-13-2019, 08:56 AM Thread Starter
 
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Thanks, it seams that its the case.
I released the mounting bolts, but the caliper itself was holding on the brake disk, as it was clamped. It can be seen in video below:


Thats how the cylinders move


How easy should it be to push cylinders back to caliper after they are out?
I am not able to do it by hand. I have to put caliper down and then push each cyinder seperately with force.
Thats how it goes:


So those are my next questions:
Should the top bolt rubber be so squezed? I was affraid not to tear it moving the caliper.
Have read the service manual to see if i am not missing something.
After pushing back cylinders, some brake fluid was gushed out of fluid case (through inspection glass).
Is it possible, that cylinders don't go back easily because of too much brake fluid? Could not check it, as the screws on the top are screwed (was able to take out only one. other is stuch with messed out head).


And see how the bold with rubber on the caliper is stuck in one place. Only pushing it out brought it back to center possition.


Any leads or suggestions.
Attached Images
File Type: jpg 20190413_142517.jpg (176.5 KB, 1 views)
File Type: jpg 20190413_135652.jpg (141.7 KB, 1 views)

1987 Honda Rebel 450
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post #6 of 16 Old 04-13-2019, 09:10 AM
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that mounting bolt with rubber seal is contributing to your problem - may be the whole problem - the bushing inside should move freely with hand pressure on both of them - that allows the pads to center over the disk

you would not be able to push caliper back in with your hand

you may need to remove some brake fluid - it would be a great time to change the fluid too if it hasn't been done for a while

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post #7 of 16 Old 04-13-2019, 09:53 AM Thread Starter
 
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You mean the caliper pin bolt?
After pushing it a little bit over, it starts moving.


But it seams that i should reassemble all the caliper and give those pins a good greasing. Bought brake silicone grease

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post #8 of 16 Old 04-13-2019, 09:55 AM
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that should help - cheers

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post #9 of 16 Old 04-13-2019, 12:18 PM Thread Starter
 
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Is the retainer pin in the manual print screen essential? I can not find any part number for it. And i thing this one is missing from my caliper.
Can it be replaced with other model part?
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post #10 of 16 Old 04-13-2019, 01:05 PM
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Does it show up in this diagram? https://www.cheapcycleparts.com/oemp...-brake-caliper

Keepin' all the left over parts. Gonna use 'em to build another bike!

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