Question about Ford F-100
A hard brake pedal is caused by a failed and leaking vacuum diaphragm in the power brake vacuum operated booster. Another reason is loss of vacuum to the brake booster, buy you should hear a loud sucking noise, also the 3/8" vacuum hose can collapse from age check that as well.
Posted on Feb 24, 2012
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Posted on Jan 02, 2017
When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.
Posted on May 25, 2009
SOURCE: Hard break pedal
there is a bulletin in ford motor company about a vacuum hose from de brake system this hose dosn't have clamp and the new has it you need to take your mark lt to a dealer. you can see the hose under the truck beside the TR sensor a litte upper. sorry my english is bad
Posted on Aug 04, 2009
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