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Post by joerobert on Jun 24, 2012 16:36:51 GMT -6
There is something wrong with my front brake. There doesn't seem to be enough pressure in the system to return the lever to the point where the brake light goes off.
I know someone else already made a thread with a similar issue, but mine goes on
i was bleeding my brakes the way we bleed hydraulic brakes at the bicycle shop i work at, and as i was using a c-clamp to push the piston back in, it gave some resistance, then let go, and the lever is now completely dead with the master cylinder not returning, i took it apart and i'm going to try to fix it, but my big question is this: do you guys (experts in my novice eyes) think it's a problem with the MC or the caliper itself? when i took apart the MC it was all corroded under the little rubber boot thing...
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Post by eaglerider on Jun 24, 2012 16:51:28 GMT -6
The corrosion was a good part of the problem. The master cylinder needs to be cleaned up & rebuilt. Bleeding the brakes on the 454 is a little time consuming.....the master cylinder must be bled first, and is somewhat messy.....pump the lever, hold it down, loosen the hose connection at the mc, tighten the connection...repeat until no air bubbles. Then, u can bleed the hose & caliper in the normal way, by pumping the lever on the mc, holding it down,opening the bleeder on the caliper, close the bleeder, and repeating until no air bubbles.
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Post by joerobert on Jun 24, 2012 18:03:23 GMT -6
sweet thanks for the quick reply! is the little rubber boot thing in the mc around the piston, between the washer and the lever, very important? like, would it not work without it? because mine ripped as i was taking it off to get to the corrosion (i'm ordering a new one from ron ayers regardless) and now it won't pump fluid through. when i take off the hose connection at the mc i can feel the pressure and suction as i press the lever and release it when i have my finger over the hole, but no fluid.
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Post by eaglerider on Jun 24, 2012 18:26:53 GMT -6
yes...if I remember right, it prevents the fluid from bypassing the piston.
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Post by joerobert on Jun 24, 2012 19:02:59 GMT -6
Ok i just ordered it. Thanks again for your help your the best, man! I'll keep you posted and i'll post pics when its all put back together
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Post by BenInPA on Jan 8, 2013 19:56:03 GMT -6
Hey eagle, I have a similiar issue with the front MC. My lever also does not return all the way. It seems there is a lot of play in the lever. I do have great front brake, but does not return the handle all the way. I have a parts vreakdown on a website to find the parts. could this problem be the little spring behind the piston going bad? Is your opinion what would the most likely cause be of this? To reguild the MC should I get all parts new? or should I take it apart and see what is worn or rotted? I am also guessing with the lever not returning fully I could loose front brake totally correct? I am ordering a bunch of parts to rebuild the front bearings so I can order all the parts to rebuild the MC if needed. Thanks...
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Post by eaglerider on Jan 8, 2013 21:33:23 GMT -6
I would get the spring and rubber parts....clean the piston good, and lightly hone the cylinder walls...clean everything very good & u should be good to go. The front brakes bleed different....bleed the master cylinder real good, then the line/caliper.
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Post by BenInPA on Jan 11, 2013 13:42:19 GMT -6
TY Eagle. Looking at the parts breakdown I can't get the rubber seals seperate from the piston. I need to order the entire piston assembly. It does however include the spring in the parts. I will order that and any o-rings I can. I read in another post that they bleed the whole system using some type of pump to force the fluid backwards from the caliper to the MC. Have you ever heard of this method and would you recommend it? I have a large syring that I can use (brand new sterile). Also is the brake fluid normal DOT 3 brake fluid or is there a motorcycle type? I have to figure out how I am going to get the screw out of the MC lid. Whoever owned the bike previously rounded out the screws most of the way. I still have a little area to grip with a straight blade screwdriver. I was thinking of hitting the edge with the thin dremel and make the grove a touch bigger for the screwdriver blade. Have you heard of anyone having this issue and any suggestions how to get them out? Thanks for all the help. This site has been a life saver not to mention saved me a load of money.
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Post by Blaine on Jan 11, 2013 13:50:46 GMT -6
As long as you bleed the MC first you shouldn't have any problem bleeding the line & caliber.Trapped air will flow downward easier than trying to force it backwards.If you have trouble bleeding the caliber,sometimes if you leave bleeder open & let air escape on it's own works well.This method worked well for me in the past.The fluid is standard automotive fluid.   |
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Post by eaglerider on Jan 11, 2013 19:09:38 GMT -6
If push comes to shove, you may have to carefully drill out the cap screws, or dremel the heads off, pull the cap off, then u can use pliers to get the rest of the screws out.
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Post by BenInPA on Feb 14, 2013 21:49:00 GMT -6
I was thinking of replacing the mc cover with a chromed one. I am seeing a lot of mc covers for the vn 750. Anyone know if that cover would fit our mc? Or can you all tell me what other bike cover might fit?
Thanks guys....
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Post by Blaine on Feb 14, 2013 22:10:36 GMT -6
I was thinking of replacing the mc cover with a chromed one. I am seeing a lot of mc covers for the vn 750. Anyone know if that cover would fit our mc? Or can you all tell me what other bike cover might fit? Thanks guys.... The VN 750 is the same.  |
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Post by BenInPA on Feb 15, 2013 9:04:35 GMT -6
Thanks Blaine, I searched ebay for a cover and all I am finding is ones for the vn 750 and a couple other ones. Nothing for our bike though. Thanks for the info.
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Post by Blaine on Feb 15, 2013 10:26:38 GMT -6
Thanks Blaine, I searched ebay for a cover and all I am finding is ones for the vn 750 and a couple other ones. Nothing for our bike though. Thanks for the info. You won't find any for the 454.Just the vn750.It;s the same one. |
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Post by BenInPA on Feb 15, 2013 15:51:49 GMT -6
Question, looking at the parts diagram it says the screws for the MC cover are 5 x 12. What is that measurement? Is that M5 x 12? Is it 5mm x 12mm? Are they both are correct way of saying it? Im looking to purchase a couple chromed machine screws for the new cover im gonna get. Looking on ebay and im finding 5mm x 12mm screws and M5 x 12 screws. Not sure if that's the same. Thanks guys....
Sent from my DROID3 using proboards
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Post by Blaine on Feb 15, 2013 18:10:13 GMT -6
Yes,5mm x 12mm & 5m x 12 both mean the same thing. |
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Post by BenInPA on Feb 15, 2013 18:13:34 GMT -6
Thanks man. Im not great when it comes to some of the measurements and stuff. If there was 1 set way of saying things it wouldn't be so bad. But when you can say the same bolt 4 different ways it kinda gets confusing. Lol
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Post by zekkfett on Feb 15, 2013 20:32:32 GMT -6
You also need to know the thread pitch. Most bolts are listed something like: 5 x 12 x 1.25. Pitch and bolt diameter would be the ones I'd concentrate on.
Sent from my LG-LG855 using ProBoards
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Post by BenInPA on Feb 21, 2013 12:27:30 GMT -6
Anyone know what the exact size of the screws in our MC cover are? The parts breakdown only says 5 x 12. I purchased some Stainless Steel screws that are 5mm x .8 x 12mm. I am guessing the pitch is the middle number. Eagle or Blaine either of you know what the screws in the MC are? Once I get around to working on the bike I'll get the old screws out and try the new ones. If they aren't the right size I'll just get some that will fit. Not like I paid a bunch for the ones I bought. Would be nice to know the exact size of them though.
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Post by Blaine on Feb 21, 2013 13:01:28 GMT -6
Sorry,I don't know.i just took my old ones with me & matched it up. |
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Post by BenInPA on Feb 21, 2013 16:23:31 GMT -6
Well I decided to go out and do a little work with the bike. The screws I got fit. Threads are correct. They are not as long as the ones that came out though. Do you know if the 5mm or 12mm is the length measurement? In any case they work. They tightened down and hold the cover just fine.
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Post by BenInPA on Feb 21, 2013 16:26:44 GMT -6
I should also add I got screws with an allen head not phillips or slotted. I always purchase allen or torx if I can cause they don't strip out easily.
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Post by Blaine on Feb 21, 2013 18:04:04 GMT -6
12mm should be the length.I also changed mine for allen head. |
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Post by BenInPA on Feb 21, 2013 19:29:14 GMT -6
12mm is length huh. That's weird cause the screws I got are shorter than the ones I replaced. And they are the same size as the parts breakdown says the mc uses.
Sent from my DROID3 using proboards
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Post by Blaine on Feb 21, 2013 19:49:01 GMT -6
12mm is length huh. That's weird cause the screws I got are shorter than the ones I replaced. And they are the same size as the parts breakdown says the mc uses. Sent from my DROID3 using proboards The ones I got to replace mine were longer.But I did get them at the hardware store. |
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Post by gcextreme on Jun 9, 2013 2:26:03 GMT -6
If the covers are the same...what are the chances they whole mc is the same?
I just need the main reservoir container box...the one i have in this new bike is busted..the little sightglass buble is busted.
I cant find any on ebay for the 454
Would one from a vulcan 750 work???
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Post by eaglerider on Jun 9, 2013 4:28:21 GMT -6
Didn't you just ask this in the general page?? you don't need to ask the same question on multiple pages.
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Post by Blaine on Jun 9, 2013 5:16:13 GMT -6
There is something wrong with my front brake. There doesn't seem to be enough pressure in the system to return the lever to the point where the brake light goes off. I know someone else already made a thread with a similar issue, but mine goes on i was bleeding my brakes the way we bleed hydraulic brakes at the bicycle shop i work at, and as i was using a c-clamp to push the piston back in, it gave some resistance, then let go, and the lever is now completely dead with the master cylinder not returning, i took it apart and i'm going to try to fix it, but my big question is this: do you guys (experts in my novice eyes) think it's a problem with the MC or the caliper itself? when i took apart the MC it was all corroded under the little rubber boot thing...[/quote Your problem is with the MC itslf.You need to disassemble,clean & install a rebuild kit.They are available on e-bay. |
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Post by gcextreme on Jun 9, 2013 9:40:31 GMT -6
Didn't you just ask this in the general page?? you don't need to ask the same question on multiple pages. Sorry...wasnt sure if anyone would reply to my original intro thread from a few months ago.. This forum doesnt seem to have as much members and activity as the vn750 forum...and theres also alot of guys on there that have or had 454s. |
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Post by gcextreme on Jun 9, 2013 9:54:33 GMT -6
I see some of the vn750 mc are round and others are square does that make a difference if it will work on the 454 or not?
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