[tmaken2157]

My dad's 500 utv has a master cylinder problem.  Anyone have this happen.

[Cosmosdan]

Some have been hard to bleed the breaks. Seems the factory isn't always getting all the air out. Try using a mighyvac to power bleed them.

[REDRIDER]

 You might have to be a little more specific.

[brian smith]

i had a master cylinder blow back seal out about a month ago one thing i found with my machine was the rod was adjusted to tight from the factory which was not letting the brakes free up they were on all the time and pedal was really hard it chewed up a set of front pads in less than 175 miles when i put new master cylinder on i readjusted the linkage arm so it wasn,t making the pedal tight it has a small amount of free play when the pedal is setting all the way back and rebleed brakes my machine gravity bleed fluild without any trouble and have not had any issues since.

[Rangerdb]

I seem to be having problems with my master cylinder on my uforce 500 also. After going through a set of brakes in a short period of time, I took the recommendations on here, put new pads on, adjusted the peddle rod to give it some play ( it was definitely set to tight from the factory) and bled all four wheels multiple times.

They worked great for about 500 kms and then the pedal started gradually going almost to the floor. I took all four wheels off, checked the pads, they were hardly wore. So I bled all the wheels again, topped the fluid up to where it was supposed to be but could not seem to get any peddle pressure. I tried bleeding them again, same thing. My son took off the master cylinder cap to top off the fluid and ended up overfilling to the top. Since I was going to bleed them again anyway, we left it and put the cap back on, went to pump the pedal and it had all kinds of pressure. I left it and it worked fine for a couple weeks and same problem again. Did the same process again and couldn't get pedal until the fluid is filled completely to the top. It's now a couple weeks later and the pedal is to the floor again.

I've checked all the lines, calipers etc for leaks, there are none. Brakes are still at least 3/4. The only thing I think it can be is the master cylinder.

Does anybody know if rebuild kits are available for them? I'm assuming it is under warranty still the bike is only 9 months old and I've got a 2 year warranty. However if it turns out not to be a warranty issue, I'm looking at $100/hr labour rate.

[brian smith]

contact your dealer and get it covered under warranty i don't think there is a rebuild kit for them i blew back seal
 out on mine

[REDRIDER]

There has to be a leak somewhere if you said you filled it to the top then they worked for a while, then you say when the pedal went soft again you refilled the fluid and it worked for a while. if the fluid is going down in the reservoir it has to be going somewhere.  When a master cylinder goes bad it often leaks internally so you can't get good pressure but the level of fluid would not make a difference as long as it was filled enough not to be getting air into the system. I would take it to the dealer, the only thing that wouldn't be covered is If you have a hose or line leaking from physical damage.

[NMKawierider]

Yeah its either a bad master or it's lost a seal. As cheap as they are it's a wonder it doesn't happen more often. It's a warranty issue..just take it in. When mine fails..its getting one from a Honda or Toyota. Lots on ebay that will adapt.

[brian smith]

if i can ask nmk what toyota master cylinder will adapt to our machines?

[NMKawierider]

if i can ask nmk what toyota master cylinder will adapt to our machines?

When I was having my troubles I was looking for masters with larger capacities but with line taps that either were the same or could be adapted as well as rod and mount compatibility and some I found were older Honda and Toyota. But I didn't save any of those findings. If I get the chance I'll take a look again and post some possibilities. 

[brian smith]

ok thanks greatly appreciated.