Trango
Member
- 735
- 22
- 18
- Location
- Boulder, CO
Hi guys, I just wanted to report back on finally rebuilding my air over hydraulic cylinder on my trailer. It took about 30 minutes, plus 30 minutes to debug and bleed.
A few hints:
A small cylinder hone would have been helpful to resurface the bore of the fluid cylinder, and also, make sure you make a reference mark on both sides of the air diaphragm housing, since indexing it is critical to make sure the air line mounting bibb gets back in the right place.
On the assembly:
There is a boot that extends over the rod that serves as the mechanical interface between diaphram and hydraulic master. Put that boot on as your very last step. First, put that boot over the small holder (looks like a spacer with a race machined in it) that slips over the rod. Then, put it on the cast master cyl itself. Only slip it onto the push rod as the last step.
When you have everything together, before you reconnect the brake line, put a little bit of brake fluid into the works to lube everything, and then cycle the air. If you can't see the piston moving through the feed hole from the reservoir, take everything apart then, so you don't have to try to recapture all of the brake fluid you just poured into the cyl (like I did!).
Anyway, this was very easy, all in all.
Bob
A few hints:
A small cylinder hone would have been helpful to resurface the bore of the fluid cylinder, and also, make sure you make a reference mark on both sides of the air diaphragm housing, since indexing it is critical to make sure the air line mounting bibb gets back in the right place.
On the assembly:
There is a boot that extends over the rod that serves as the mechanical interface between diaphram and hydraulic master. Put that boot on as your very last step. First, put that boot over the small holder (looks like a spacer with a race machined in it) that slips over the rod. Then, put it on the cast master cyl itself. Only slip it onto the push rod as the last step.
When you have everything together, before you reconnect the brake line, put a little bit of brake fluid into the works to lube everything, and then cycle the air. If you can't see the piston moving through the feed hole from the reservoir, take everything apart then, so you don't have to try to recapture all of the brake fluid you just poured into the cyl (like I did!).
Anyway, this was very easy, all in all.
Bob
For bleeder screws, try any well-stocked auto parts supply house.
