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MG TD TF 1500 - Master cylinder rubber boot question
|In assembling my resleeved TD master cylinder I test fit the external accordianed rubber boot. This provides a snug fit to the master cylinder. While I have yet to fit the assembly to the push rod (which is still mounted in the car) there does not appear to be a way for air pressure in the boot to be equalized to atmosphere as the brake pedal is depressed and released. How is this accomplished? |
I'm tempted to punch a small hole through the boot in a location where water and dirt infiltration may be less of a concern. What have other people done?
|Don't think it was meant to be 'atmospherically balanced'...when the the push rod is in place...there should be a few natural places for air to escape. (Don't think mine really accordians all that much?)|
|gblawson - TD#27667|
|I painted my master cylinder with POR15. The surface is sufficiently smooth that the rubber boot provides a surprisingly air-tight fit to the master cylinder. I was partly wondering if pressurization in the boot might force a little air past the seal and into the brake fluid. I realize that while the rubber boot is being pressurized, so to is the brake fluid. That means this is probably not a significant concern.|
I'm afraid the engineer in me is showing through!
|Think the seal is way tighter then the boot could be...the rod on mine slides easily in and out of the boot.|
|gblawson - TD#27667|
|The Closure to the cylinder has a hole which allows the pressre in the cylnder equalize. The air hole must always be clear or the pressure contained will not let the fluid clear back|
My question isn't about the internal hydraulic system operation of the master cylinder. The rubber boot I describe is strictly to prevent road dirt and water from contacting the external moving parts which are otherwise exposed in the master cylinder.
|Larry - I think that the air will just push past the rod as it is pressed. Cheers - Dave|
This thread was discussed on 27/10/2006
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