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Posted on Jan 02, 2017
The master cylinder supplies the pressure to the brake fluid that travels between the maste brake cylinder resevoir and the brake caliper pistons (through the brake lines. If the master cylinder fails there will be insufficient compression of the brake fluid to make the calipers operate as designed. Leaks in the brake lines and/or cylinders is a possibility, and unrelated to functionality of the master cylinder. Also, pistons located in the brake calipers can form a corrosion ring on their inside walls if there is breakdown in the brake fluid or moisture that gets into the lines. Operating the vehicle when there is insufficient brake fluid in the master cylinder resevoir can also lead to air getting into the brake lines, causing bad working brakes. Air compresses more than brake fluid, and the master cylinder isn't designed to compress air in the brake lines. Sounds like a bad case of "lack of maintenance", as opposed to bad advice from the mechanics. That said, there's no excuse for bad installation. But, it's tough to improperly install a brake line since they are nothing more than hollow metal tubes. There should be no rubber connectors installed in the brake lines. When bleeding the brake lines one must remove all of the trapped air before you will see any fluid appear. If the valves in the master cylinder are not properly operating the master cylinder will not allow the brake fluid to get into the brake lines.
Hope this helps.
Posted on Jun 13, 2009
With the engine cold remove the radiator cap. Start the engine. Watch the coolant. If you see bubbles constantly perkulating out of the coolant than you most likely have a head gasket that has failed. If you don't see a constant perkulation of air bubbles it probably wouldn't hurt to replace the upper hose and see if the problem is resolved.
Posted on Jan 13, 2012
Testimonial: "Appreciate the advice. Actually applicable and pertinent to the problem... and quick response on this question. Thank-you."
Usually a sign the thermostat is not working correctly, or you have air pockets in the cooling system.
Posted on Sep 14, 2015
The hose that collapses is weak and needs replacing. The engine vacuum cannot be all that great, normally runs around 17-22psi at idle and only increases a little during deceleration, not above about 26-28psi. Not enough to collapse a good vacuum hose.
Posted on Oct 25, 2015
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---------This will help.Thanks.
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