Shimano M445 Hydraulic brake not responding

[kolaval]

Hi

 

I got a silverback saturn with Shimano M445 Hydraulic Disc brakes secondhand.

The back brake does not respond when I pull the lever.

I do not suspect a spacing issue since the pads are close to the disc

If I look closely the pads do seem to move when I pull the lever, but not enough to grip the disc.

 

I assume I have to bleed the brake?

Which brings into question, how often do you need to bleed them?

Do I buy my own kit or just take it to whomever can fix it in centurion?

[Jigghead]

Probably need to bleed the brakes, you can do it yourself very easily, frequency depends on things like how often you ride, brake system condition and a few others.

 

Generally, if you're feeling a lot of fade or need to pump them in order to get propper stopping performance, it's time for a bleed. If it happens too often, then have the whole system checked out, you could be getting air into the system due to a faulty seal.

[dirtrider]

It is easy to do it yourself but if you not sure then take it to bike shop .

[kolaval]

I prefer trying myself first.

Do I just go to cajees and ask for a hydraulic brake bleed kit, or must it be specifically for this M445 kit?

[Ryan]

I prefer trying myself first.

Do I just go to cajees and ask for a hydraulic brake bleed kit, or must it be specifically for this M445 kit?

 

If you are in the Centurion area rather go to Epic Sports instead of Cajees...

[vdLRSA]

You can quite easily make a kit yourself and it will come in much cheaper.

Google how to bleed those shimano brakes and how to make a DIY Shimano Bleed kit.

[porqui]

DIY - make own kit

Google is your friend.

Can't do without youtube

+1 As said above

[Firozfx]

My eyes hurt when I saw Cajees. Wallet started shaking. Pockets with holes, paper notes burning in my hands. Any Rand spent there is a Rand too much

 

A big syringe, correct brake fluid, and rags is all you need.

[AdamA]

if Bleeding does not help then, You May Also Have 'Contaminated Brake Pads'.... Ie OIL, LUBE or Break-fluid on your Pads.... you can clean them by this Process...

Remove the Brake pads for calipers.

soak in petrol.

place on a non-flammable surface outside ( on a old Brick)

Set a on fire.

Let it Burn, black smoke is normal.

once the flame is out, leave to cool ( for about 5 minutes)

Clean off the Black Carbon residue with Clean Green, Water and a Scrubbing brush.

Remove the Shine on the pads with a piece of sand paper.

replace in caliper.

Clean the Rotor with CleanGreen and water , rinse well. and dry

Replace wheel.

Align Caliper.

Test.

[Wyatt Earp]

Maybe you have oodles of air because the previous owner also made his own bleed kit.

The funnel is the trick here ,or a syringe with the proper thread attachment for the lever side.

On the calliper side a sys ring with a hose you can get from anywhere.

Good luck.

[rouxtjie]

My eyes hurt when I saw Cajees. Wallet started shaking. Pockets with holes, paper notes burning in my hands. Any Rand spent there is a Rand too much

 

A big syringe, correct brake fluid, and rags is all you need.

If you know exactly what you are doing....I take it you are bleeding from the caliper side...Very easy to pop the caliper there is no recourse ito warrantee...

 

BE CAREFULL WITH THIS METHOD.....LESS IS MORE ITO FORCE

[dirtrider]

Rouxie I have seen this comment now a few times . Why all the pressure needed when bleeding the brakes ? I always bleed from the bottom but the system is open and at no point would there be excessive pressure in the system . Am I doing it wrong ?

[Firozfx]

If you know exactly what you are doing....I take it you are bleeding from the caliper side...Very easy to pop the caliper there is no recourse ito warrantee...

 

BE CAREFULL WITH THIS METHOD.....LESS IS MORE ITO FORCE

Oh sh1te. Sorry should have mentioned:

 

I used the syringe as I was able to thread it into the cylinder. And then use it as a funnel. And then bled at the caliper end

[Firozfx]

If you know exactly what you are doing....I take it you are bleeding from the caliper side...Very easy to pop the caliper there is no recourse ito warrantee...

 

BE CAREFULL WITH THIS METHOD.....LESS IS MORE ITO FORCE

Oh sh1te. Sorry should have mentioned:

 

I used the syringe as I was able to thread it into the cylinder. And then use it as a funnel. And then bled at the caliper end

[divernick]

Do it yourself, easy peasy. Go to Tool-up cycles or any shop and ask them to lend you a "bleed block" and buy some Shimano mineral oil.

 

Get 2x 10cc plastic syringes from a pharmacy and a meter of fishtank tubing. Then do as in the video below:

 

https://www.youtube.com/watch?v=QciJbZf6Bqc

[rouxtjie]

Rouxie I have seen this comment now a few times . Why all the pressure needed when bleeding the brakes ? I always bleed from the bottom but the system is open and at no point would there be excessive pressure in the system . Am I doing it wrong ?

Dont think you doin it wrong its just that it is a ghetto bleed...I do it myself too....BUT

 

there are some membranes in the caliper internals...squeezing too hard on the syringe if you are in a hurry will pop these membranes and then the whole thing is fubar...

 

The pressure I am referring to will be from your thumb on the syringe plunger....a sign that you have cocked up your brakes is that after a bleed and ride there will be oil leaking from you caliper...Gooi weg