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Hydroboost brakes locked up Steve 9-27-14  
I acquired an "81 Travelcraft motorhome with a G30 Chevy chassis. It has been sitting for a few years. I have replaced both front calipers and the master cylinder which I really don't regret, but the brakes are still locked up. I'm assuming the problem lies within the hydroboost system, but now we're talking much more expense. The power steering is working so I'm thinking It's not the pump. Could the booster be stuck from lack of use? Is there a possibility it could be removed & loosened up or should I just bite the bullet & replace it?
Re: Hydroboost brakes locked up BUBBA THE BUS TECH 9-29-14  
Have been thinking about this a little.

Common failures with this system:

The master cylinder push rod may be too long, this was common when these units were new, now that the parts available are more and more "Will Fit" its worse. Un-bolt the master cylinder from the hydroboost to check. You don't need to remove the brake lines, just move the master 1/2 inch away on the studs. If the brakes release you have your problem.

Next if any one has mucked with the Hydroboost the push rod from the brake pedle could be the problem. Also the return spring on the brake Pedel could be broken. Try lifting the brake pedel.

One of the common failures everybody forgets to check for is bad rubber lines at the wheels and rear axle. Open the bleader valves and see if fixes the problem until you step on the brakes next time.

Good Luck
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