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Search Auto Parts Search F750 chassis mount brake booster test Sign up here! 1 2  View All Email This Post Auto Repair Home>> Automotive Repair>> Brake Repair Help Tom Greenleaf Ultimate Carjunky / Moderator May 7, 2016, 12:00 PM Post #26 of 28 (763 views)      Re: F750 chassis mount brake booster test   Refresh - NO - you have a rebuilt booster and it sat for a while. True it should lock vacuum in booster for days even if perfect such that engine off you still have power assist a time or two same as if stalled. Don't keep pulling the check valve out or it isn't a maybe it will be a leak. It's barbed pretty hard into the grommet and if not why not? they really can tear up one time with new stuff but just wouldn't hold vacuum when not available as said. If working now shut engine off and just wait 10 minutes. Without starting it should have power assist and if not that's proof of a leak. When running there's ample vacuum at all times except wide open throttle to cover a small leak but not a wide open one. I somehow you or we are just not getting to the problem like about any issue this important seek out help in person. There's a limit to what you can do without being right there, Tom mbavers User May 12, 2016, 6:14 PM Post #27 of 28 (738 views)      Re: F750 chassis mount brake booster test   End of the saga. I replaced all the hoses and fittings. There are a total of 12 separate connections on the vacuum line between the intake manifold and the booster (intake manifold connection, check valve in, check valve out, brass T fitting for vacuum gauge, reducer from T fitting to vacuum gauge, check valve to steel tube, steel tube to booster, etc.) Some of the old fittings were the wrong ones for the job. Instead of a hose barb T they had used a flare T with the vacuum line connected to the threaded ends of the flare fitting. No wonder it never held vacuum with the engine off! Drove it and brakes work perfectly and vacuum is a healthy 20-24 HG. The system holds vacuum overnight. Reason this took so long is that I had to mail order a 1/2" X 1/2" X 3/8" hose bard reducer T. Thanks to everyone for advice. Tom Greenleaf Ultimate Carjunky / Moderator May 13, 2016, 1:32 AM Post #28 of 28 (736 views)      Re: F750 chassis mount brake booster test   Thanks for the report of findings and the fix. I'll close out thread as solved to keep spammers away. YOU may request it to be re-opened upon YOUR request to any moderator, T 1 2  View All Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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