Post by jeepsteve92xj on Jul 29, 2013 8:03:45 GMT -5
Now between two scooters with front and rear disk brakes, I have replaced 3 sight glass.
The original plastic does not get along with the brake fluid.
I replaced the broken down plastic with watch crystal. 16mm X 1.0mm
I used RTV Black.
First one on Xingyue front brake master was in July 2010. It was opaque tan, and I touched it and it crumbled. Ordered 4 crystals.
www.esslinger.com/watch-glass-round-flat-mineral-glass-crystals-1mm-thick.aspx
I looked at kits or services to do the repair. Most sites were old and defunct, or cost more than the price of a new brake system with master, lines, hose and caliper together.
Still looks crystal clear today.
Second one was on the Znen rear brake master when I pressurized the reservoir by moving the pistons back into the caliper without removing the lid. Same size crystal, more RTV Black - with more than 20 hours cure time before adding brake fluid and bleeding.
Third one was the rear brake on the Xingyue. I was looking at -NOT TOUCHING- and it appeared to be bulged or bloated. I took the lid off and it started leaking.
For sure that fluid was due to be replaced anyhow. Cleaned the hole, more RTV Black and another new crystal. Curing for another 20+ hours. No doubt I will bleed both front and rear with all new fluids tonight.
The front brake master on the Znen still looks good, and that fluid is only 1 year old.
The original plastic does not get along with the brake fluid.
I replaced the broken down plastic with watch crystal. 16mm X 1.0mm
I used RTV Black.
First one on Xingyue front brake master was in July 2010. It was opaque tan, and I touched it and it crumbled. Ordered 4 crystals.
www.esslinger.com/watch-glass-round-flat-mineral-glass-crystals-1mm-thick.aspx
I looked at kits or services to do the repair. Most sites were old and defunct, or cost more than the price of a new brake system with master, lines, hose and caliper together.
Still looks crystal clear today.
Second one was on the Znen rear brake master when I pressurized the reservoir by moving the pistons back into the caliper without removing the lid. Same size crystal, more RTV Black - with more than 20 hours cure time before adding brake fluid and bleeding.
Third one was the rear brake on the Xingyue. I was looking at -NOT TOUCHING- and it appeared to be bulged or bloated. I took the lid off and it started leaking.
For sure that fluid was due to be replaced anyhow. Cleaned the hole, more RTV Black and another new crystal. Curing for another 20+ hours. No doubt I will bleed both front and rear with all new fluids tonight.
The front brake master on the Znen still looks good, and that fluid is only 1 year old.
