| Re: Repeat of a note about brake bleed screws [message #370250 is a reply to message #370239] |
Tue, 02 August 2022 10:08   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
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Senior Member |
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Doug,
If you ever stood in front of your coach in the rain.... (Standing in the rain is not always stupid.)
But if you had, you would have seen the windshield directing the run-off to the master cylinder. If that rubber diaphragm in the master cylinder cover has any sort of porosity, water will get into the brake fluid there.
I am hugely in favor of flushing the brake system. What I also do is periodically check the reservoir fluid with a conductivity device. The devices are not expensive and are actually less expensive than the half gallon of brake fluid it takes to flush the system of a TZE.
There are also other places that water molecules can get into the brake system. Unlike drum brakes where the parts live in the shelter of a drum, the piston of a disc caliper are right in the flow of water that the pads are peeling off the disc. While the piston seals don't wipe in normal operation, they do slide as a matter of course over time. This is not as much of an issue as a wheel cylinder that has a bad boot. The cup seals of drum brake wheel cylinders almost invite moisture intrusion. The boots age out just like all the other rubber part of a 50yo coach.
Oh, if you still have the OE steel brake lines, inspect the areas where it is clamped. That is where I had corrosion issues. Metal brakes lines of the period were terne plate, and while that is corrosion resistant, it isn't all that thick and not as good as real galvanizing.
Matt
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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