Whitby PB and CNC

[chopthebass]

I thought this would be an easy one to solve. But no!

The brass fittings with the CNC reservoirs are smaller than the plastic spouts on the Whitby PB master cylinder. I was wondering how to join the two. Originally I replaced the brass fittings in the CNC with bigger ones to match the spouts. But the hose required is too big and ugly, and doesn't bend how I want it.

So I tried what Whitby suggested. I popped out the plastic spouts in the MC, and replaced with a 90 degree (fuel line?) fitting with an NPT thread one end and a barbed spout the other end. This fitting screwed very tightly into the rubber grommet in the cylinder. I thought I had solved it, but it appears fluid gets drawn up the NPT thread and leaks! Doh!

Whitby used to include a reducer in their kit, but no more.

Is there an easy fix?

[edwardb]

The connections in the bottom of the CNC reservoirs are 1/8 in. NPT. For my last build, I had a mixture of 5/16 and 3/8 inch hose, plus the straight connections supplied with the CNC reservoirs make for some interesting bends in a tight space. I used these right angle fittings from Summit. Worked perfect. Maybe would help your installation.

http://www.summitracing.com/parts/gar-j9031

http://www.summitracing.com/parts/gar-j9032

Also, normally you should use some type of sealant on NPT fittings. Provides a little lubrication plus sealing for the tapered threads. I normally use Loctite 567, but others can work too. Use it sparingly and none on the first couple threads. Generally not recommended to use Teflon tape for anything brake related.

[chopthebass]

Thanks Ed. I have same fittings coming out of CNC, and I am assuming I need to put back the plastic spouts that came with the Whitby kit. Then I need to work out how to go from large spout to small fitting. So do you mean you used a larger hose on the spout, then a length of small hard pipe to get you down to the same size on the CNC?

[edwardb]

Thanks Ed. I have same fittings coming out of CNC, and I am assuming I need to put back the plastic spouts that came with the Whitby kit. Then I need to work out how to go from large spout to small fitting. So do you mean you used a larger hose on the spout, then a length of small hard pipe to get you down to the same size on the CNC?

I use whatever fittings are needed on the CNC reservoir to match the inlets to the MC's. Same size at each end and then one piece of hose. The two fittings I linked to fit my previous build, which included the MC on a hydroboost unit and a Wilwood clutch MC. Just looking at the fittings I need to connect to on my new build, expect it to be similar.

[chopthebass]

Thanks Ed. I understand. That's what I initially did. The larger fitting was on the MC. But the hose I needed was huge and ugly.