HILLMAN CAR CLUB
OF SOUTH AUSTRALIA INC

Tech Tips: Master Cylinder Honing
How not to do it     by Jim Leach
HILLMAN CAR CLUB
OF SOUTH AUSTRALIA INC



From: Tigerootes (at) aol.com
Sent: Sunday, July 05, 2009 12:10 PM
To: HillmanCars@yahoogroups.com
Subject: Re: [HillmanCars] Master Cylinder Question

Here is a TECH-TIP I haven't posted here before, regarding the honing of Brake and Clutch Master Cylinders ...

Over the years I have rebuilt hundreds of master cylinders and many years ago, I wondered why my rebuilds (cast iron cylinders) failed after about three years of service almost like clockwork!  At the time I was using a spring-loaded 3- (flat) stone honer, tiny but very similar to what a machine shop would use on an engine block during a proper rebuild.

Anyway, I dropped the darned thing on the floor and broke one stone, so as a replacement I purchased a carbide 'ball' honer and not one rebuild since then has failed.

The answer: flat honing stones cause the drilled ports in the bores to become VERY sharp and the cup/s take damage every time they pass over those ports.  By using ball hones, those passages are automatically chamfered.

I bought a full set of ball hones ... very costly (even back then) but well worth it.

Jim


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