I lose all pressure in my brakes when i start the truck

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I have replaced my front calipers, lines, master cylinder and booster, (booster and cylinder replaced twice). I have good pressure after bleeding at all four wheels, but as son as the truck starts, i lose all pressure in my break pedal. I can push it all the way to the floor and it slowly depresses back. Any ideas?

How long has your 1998 Ford F-150 had this problem?

About 2 weeks, it started after replacing the calipers.

Visitor

in Benson NC

Apr 13, 2021

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What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 1998 Ford F-150. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

Popular Answer

I lose all pressure in my brakes when i start the truck

What is your question?

How long has your 1998 Ford F-150 had this problem?

About 2 weeks, it started after replacing the calipers.

Visitor

in Benson NC

Apr 13, 2021

1 Reply

Popular Answer

DaveJMon Apr 14, 2021

Still sounds like air in the system. All 4 wheels need to be bled, the master cylinder needs to be bled, and the ABS system needs a service bleed -- using a diagnostic tool like Ford's IDS tool. www.repairpal.com/repair-shops

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Popular Answer

What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 1998 Ford F-150. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.