Question about Ford F-100

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Brake pedal hard to push in on 1981 Ford F 100 what cause that

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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

  • 409 Answers

SOURCE: brake pedal is hard to push and the car doesn't stop very well

Yes it could be the booster.

Posted on Dec 26, 2008

  • 79024 Answers

SOURCE: 1989 ford thunderbird standard brake system has hard pedal

I would think the power brake booster has failed, do u hear any hissing when u press the brake pedal?

Posted on Jan 16, 2009

  • 3433 Answers

SOURCE: hard brake pedal hear air leaking when pedal pushed

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

  • 11 Answers

SOURCE: brake pedal hard to push and hear air rushing in

Brake power booster has failed, replace.....

Posted on Jul 19, 2009

  • 22 Answers

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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Brake lights dont come on till I step ******* pedal

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Clutch pedal goes to the floor and hard to into gear at times

Check The Fluid Level At The Resevour First. If Extremly Low You May Have To Bleed At Slave Cylinder On The Side Of Bell Housing. Bleeder Is The Same As A Brake Bleeder.8MM Or 5/16. Same Fluid DOT-3.

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Clutch pedal fails to return fully after depressing.

If your truck has a hydraulic clutch it will have an extra reservoir, near the brake fluid reservoir, and the clutch side uses brake fluid also. Your problem I think, is that you are low on fluid. That can cause the problem you describe. Look for this extra reservoir and check it for low fluid, it may be dirty but should have full / low mark on the side.

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Apr 26, 2009 | 1981 Ford F 100

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Rear running lights and brake lights wont work on my 1981 ford f100 new bulbs and light switch what do i do next

I'd start probing with a test light, or continuity test. Try in & out of your brake switch at pedal, if power there, follow harness outside & down under, and work your way back, or start at plug under, at rear bumper area,or above, near axle probably, & work forward. If you use continuity tester, run a jumper wire from wire going from switch at brake pedal (wire that doesn't have power until pedal pressed.) long enough to reach the back tail lights & see if continuity is there,at back of socket, or in socket, then work forward from there. My guess is that when you find the bad spot in that wire, you'll find the other too.

Apr 05, 2009 | 1981 Ford F 100

1 Answer

Front brakes gradually lock up.

it is possible that the calipers are binding when hot. It could also be the brake hoses. If the hoses are collapsing internally it will cause the brakes to drag

Feb 28, 2009 | 1981 Ford F 100

1 Answer

Problems with front brakes on 1980 F-100

its common for older calipers to lock up. try cleaning the slides and lubing them. also when the calipers are off make sure the piston moves by depressing it all the way in. then drive again.

also very rare but you could have a bad brake hose causing pressure to stay inbetween the colapsed hose and caliper. this will keep a slight pressure on the side with a bad hose. but not so common like i said.. checking a bad hose by removing hose from caliper side. fluid should continue to flow out. if nothing flows out after 2 or 3 minutes you have a resriction somewhere. then remove hose from the hard line to see if fluid flows from the brake line. if fluid flows from brake line you have a bad hose. if fluid still does not flow from brake line you have other issues before the brake line. could be bad master.check master the saem way you check hose hopefully its easy. GOOD LUCK

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Feb 09, 2009 | 1981 Ford F 100

2 Answers

1976 ford f100 pickup 2wd front brakes are holding after i drive 3 or 4 mile. I put new brake line,master cylinder,and caliper.I done all the bleeding of the lines out and it still holds.

Did you replace master cylinder with correct type?
If disc brakes fitted on front, there should not be a check return valve in front supply port.
Check supply pressure once brakes have started to hold, loosen one of front bleeders to see if any residual line pressure with pedal released.

Aug 04, 2008 | 1981 Ford F 100

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