[4TrAxmudd]

I can’t get the rear brakes bled. I have pumped and held the peddle many times according to the service manual.Is there a rebuild kit for the master cylinder? Or is the caliper shot? The plunger in the caliper will not move.

 

[GirlsRideToo]

I can’t get the rear brakes bled. I have pumped and held the peddle many times according to the service manual.Is there a rebuild kit for the master cylinder? Or is the caliper shot? The plunger in the caliper will not move.

There is a sub-assembly for the master cylinder at partzilla:
https://www.partzilla.com/catalog/h...x-a-fourtrax-300ex/rear-brake-master-cylinder

Rockymountainatv.com probably has one, too.

Can you get brake fluid to flow through the master cylinder and to bleeder valve?

If the slide pin is seized you most likely will not be able to get it to turn. Is it really seized or is the head stripped??
I hope others can give you more advice about this problem.
If it were me, I'd replace the caliper first before rebuilding the master cylinder. Inspect and clean the master cylinder and hose.

Hope this helps you.

 

[_Wilson_]

Question

I can’t get the rear brakes bled. I have pumped and held the peddle many times according to the service manual

Has this 300 been moded with rear hydraulic brakes ? Or, are you talking front brakes ? Because the trx fourtrax 300 has rear cable brake operated, however.... they should have factory with hydro disk....just my 2 ...

 

[4TrAxmudd]

It has the hydraulic disk on it.

 

[retro]

Here is a sticky with info that you can apply to your disc brake system:

https://www.hondaatvforums.net/forums/brakes-suspension/15549-how-bleed-your-brakes.html

 

[_Wilson_]

https://www.hondaatvforums.net/forums/honda-fourtrax/129324-300ex-battery-will-not-stay-charged.html

I see by your other post (battery charge issue) this is a 300 ex .

 

[fishfiles]

https://www.hondaatvforums.net/forums/honda-fourtrax/129324-300ex-battery-will-not-stay-charged.html

I see by your other post (battery charge issue) this is a 300 ex .

Keen eye ! I was wondering about disc on the rear of a 300 Fourtrax

 

[_Wilson_]

Thx! Had me wondering to. However, I was looking forward to a TRX 300 rear disk build.

 

[4TrAxmudd]

Yes it is.

 

[shadetree]

this is why it clearly says on every thread section...PLEASE POST THE FULL MAKE/MODEL/YEAR !. notice the make in these words ??. BIG DIFFENCE BETWEEN A TRX300, AND TRX300EX !.

 

[4TrAxmudd]

I ordered a new caliper for it, will keep you posted how it works out.