Brake seal direction

[dna9656]

What's the trick in installing the brake caliper seals in the right direction? It was easy determining the direction, the ridge faced outboard when I disassembled the calipers. Now installing the new seals in the correct manner seems more difficult than I thought.

I'm working on my 1988 VR with the stock dbl. piston per side caliper brakes. I have the red rubber grease.

I thoroughly cleaned my caliper pieces with aluminum safe solvent and my ultra sonic solvent tank. I blew 125PSI air through all the orifices and gave each groove a hard looking over. I lubed the O rings with the red rubber grease provided in the Brake Crafters kit.

Edited June 28, 2018 by dna9656

[cimmer]

Are you using any of the supplied red grease on the seal and piston when you go to install them? Also make sure you have the seal area nice and clean so the new seals fit completely in them.

Are this the double piston 83-85 calipers or the 4 piston 86-93 calipers we are dealing with here?

 

Rick F.

[dna9656]

Are you using any of the supplied red grease on the seal and piston when you go to install them? Also make sure you have the seal area nice and clean so the new seals fit completely in them.

Are this the double piston 83-85 calipers or the 4 piston 86-93 calipers we are dealing with here?

 

86 to 93 quad piston.

 

Rick F.

 

Missing info edited in, sorry....

Edited June 29, 2018 by dna9656

[Marcarl]

Just to make sure: check the grooves, and then check them again using a 90 degree pick. You might be surprised as to how much crud is hidden in the corners. Go slowly and then when you think you got it all, do it again. The seals are a perfect fit, as they should be, and any crud in the corners will push them out and the pistons won't go in. If you had taken a close look at the ones you took out you probably noticed some dimpling, that was caused by the crud.

[dna9656]

Just to make sure: check the grooves, and then check them again using a 90 degree pick. You might be surprised as to how much crud is hidden in the corners. Go slowly and then when you think you got it all, do it again. The seals are a perfect fit, as they should be, and any crud in the corners will push them out and the pistons won't go in. If you had taken a close look at the ones you took out you probably noticed some dimpling, that was caused by the crud.

Somewhere I red these seals have a direction... maybe that's the Yamaha seals, Brake Crafters says there is no direction. This is their response to my direction question:

 

"Seals are NOT directional! A slight camber is cut into the seal ring within the caliper and it doesn't matter which direction the seal is placed. This the same for both the dust seal and pressure seals.

 

Brake Crafters has written me and offered to walk me through it all WAY TO GO BRAKE CRAFTERS!!!

 

 

 

Pressure seals are made from effectively a tube which is cut. Dust seals are injection moulded as they 'wiper' section on the interior of the seal."

 

I will look AGAIN tomorrow but I'm pretty sure I got everything.

Thanks Marcal!

Edited June 29, 2018 by dna9656

[cimmer]

I did have to clean out the grove they sit in with a pick to get all the crud out but they did slide in nice and tight. I applied the grease to them after I had them in place so the grease didnt apply any pressure to them when seating them in the grove. I had to run my fingers around the pressure seal to get it to seat properly.

Hope that helps.

 

Rick F.