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Brake help. Already?

1589 Views 33 Replies 9 Participants Last post by  smilie
04 VTXc 1300 16k troubleshooting my front brake, after geting very little squeaze on the disc and atemping to bleed the ckt. I discovered that there is very little if no pressure coming from the resevoir. Every time i pull the front brake with fluid in place i got only drops at the caliper or the bleed screw. Wich i guess for now eliminates the caliper as the culprit. At the brake lever i notice a black rubber diaphram looking part that compresses everytime you pull the brake lever. what kind of parts in there can be replaced ,can it be a cloged hose if so with what ????? Im not a mechanic however i will try to repair it till its fubar then take it to a mech. Help
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If there is a layer of mud on the bottom of the master, clean it out with brake clean and see if you can inspect the very small hole. Also the larger hole supplies fluid to pump.They have to be clear.
Ill double check but I beleive one of the two was closed with some metal piece, looked like part of the internals to me. So i take it both holes should be opened ? Ill take some pics,.
The larger hole supplies fluid to the piston and the small one is called a compensation port to allow the fluid under pressure to release pressure when you let off the brake, or it will stay pressurized and the brakes will drag.
If you actually see metal you had better rebuild or replace the cylinder. There are only 4 or 5 parts and it should be easy to inspect. Release the circlip and the piston will slide out.
The larger hole supplies fluid to the piston and the small one is called a compensation port to allow the fluid under pressure to release pressure when you let off the brake, or it will stay pressurized and the brakes will drag.
If you actually see metal you had better rebuild or replace the cylinder. There are only 4 or 5 parts and it should be easy to inspect. Release the circlip and the piston will slide out.
Where exactly is the circlip and how do i release ?
View from above the master cylinder.

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Take the lever off and pull the rubber boot out and you will see the small clip and pry it out to release the piston.
That photo looks pretty good actually. The large hole is visible and below that small metal shield is the compensation port=very small hole.
Take the lever off and pull the rubber boot out and you will see the small clip and pry it out to release the piston.
Wont da boot tear ?
Put some WD40 on it and pry it gently with a small screwdriver on the edges. It may be old and cracked already.
Put some WD40 on it and pry it gently with a small screwdriver on the edges. It may be old and cracked already.
I pulled the boot out. But the clip is a real beeatch, im stuck on it.
If you removed the banjo bolt, they can be a real bear to bleed. So much so that I would reverse bleed first before replacing any parts.
Reverse bleed as in push fluid from the bleeder screw or caliper ?
Yes bleeder screw. You need to use a Mity Vac pump or the Harbor Freight one. Air rises naturally that's why reverse bleeding works best. Justa thought before you go tearing into parts you don't need.
Story just got weird. Remember im not a mechanic, so this pm i essentialy redid everything i did yesterday exept now a get a nice good squirt out the bleeder nut. So i bled them and im way better than when i first rode it id say its up to 70-80% capacity. Rideable anyway. Thanks guys. Btw i still plan on taking it to get a safety check soon as i get the title transfered.
Story just got weird. Remember im not a mechanic, so this pm i essentialy redid everything i did yesterday exept now a get a nice good squirt out the bleeder nut. So i bled them and im way better than when i first rode it id say its up to 70-80% capacity. Rideable anyway. Thanks guys. Btw i still plan on taking it to get a safety check soon as i get the title transfered.
That's not weird, Cisco. That's what happens when you get something right. ;)
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