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Old 08-10-2018, 12:20 PM
rvsxer rvsxer is offline
Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 313

The early Cleveland master cylinders had an external spring but it was too weak from the factory so they issued a Service Bulletin to change them. They provided the parts free at the time. I changed mine but I don't think I had a problem to begin with.
When you set up the brake pedal linkage it is essential to make sure there is no binding as that will cause dragging brakes with any stock master cylinder springs, internal or external. There's nothing wrong with adding external springs but make sure your linkage is set up correctly first.
Mike Hilger
RV-6 N207AM w/G3X, 1,600 hours +
South St. Paul, MN (KSGS)
Manager - Panel Design, SteinAir, Inc.
A&P, EAA Tech Counselor

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Old 08-11-2018, 09:44 AM
JonJay's Avatar
JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 4,161

Originally Posted by rvsxer View Post
There's nothing wrong with adding external springs but make sure your linkage is set up correctly first.
There may even be additional benefit although I am no engineer. There are some really clean approaches to this like Tomís that add bushings and the collar.
The master cylinders are intended to be actuated in a straight line. The geometry of the Vans pedals doesnít do this, they put a side load on the shaft. ( per discussion with Matco). This side load wears the shaft and seal and they will eventually leak. (Mine did at about 600 hours.)
Perhaps the added spring with collar and bushings will help with the shaft side load issue? Perhaps not.
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Old 01-05-2019, 05:13 PM
NasCar NasCar is offline
Join Date: Jun 2013
Location: Boulder, CO
Posts: 4

I am not a builder unfortunately. I'd like to one day. I just bought My RV8. Most fun ever imaginable and thank you for welcoming me into this very special group!

Today I had what I believe is the very issue I read in this tread... My landing went great and while taxing back to the hangar, I felt my right brake dragging. By the time I got to the hangar, it was smoking and crazy hot. Melted a half dollar size bubble in my paint. Bummer!

The brake is toast now. Nothing left. After it cooled, I tried a slow speed taxing and had nothing. No right turn capability. I had to shut down and walk her home.

My buddy Mike and I are going to dig into it tomorrow. Any advise one where to start (Once I dull the pants). I assume this spring and alignment thing is the culprit. Thank You!
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