rear brake effect
Thread Starter
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Lead Driver
Joined: Nov 2000
Posts: 6,624
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From: Albuquerque
rear brake effect
I was wondering if my rear brakes were working well so I applied the emergency brake to see and didn't get much slow down at all. Would this be normal? Maybe the mechancical brake doesn't apply as much force?
Cargo Master
Joined: Jun 2014
Posts: 2,212
Likes: 322
From: Central Florida
You'll need to check to see if your eBrake linkage is adjusted properly before drawing any conclusions. The adjuster is just to the rear of the cab and is reached by getting under the truck. The cables can get pretty slack over time.
Cargo Master
Joined: Jul 2005
Posts: 2,309
Likes: 364
From: Kansas
and ensure the rear brake shoes them selves are adjusted correctly. And if your feeling ambitious, you can pull the drums and make sure the primary and secondary brake shoes are in the correct orientation...the shoe with the most friction material should always be the rear shoe.
But otherwise, using just the emergency brake for stopping will be MUCH less effective than when the front disks are involved.
But otherwise, using just the emergency brake for stopping will be MUCH less effective than when the front disks are involved.
Fleet Mechanic
Joined: Jul 2017
Posts: 1,448
Likes: 163
From: East Texas
If you are just wanting to check the parking brake, park on a hill with a decent grade, put parking brake on and put transmission in neutral. Parking brakes should hold if working.
Now for overall rear brake function, I would pull the drums and inspect. The shoes could be out of adjustment.
Now for overall rear brake function, I would pull the drums and inspect. The shoes could be out of adjustment.
Elder User
Joined: Feb 2011
Posts: 575
Likes: 6
From: Knoxville, TN
Maybe not lock the rear up but it should slow it to a stop and be able to hold the truck when parked.
Emergency brake isn't just for parking on hills....they are supposed to be a working manual brake you can apply if needed in an emergency....and with that, it the rear was to lock up, then your vehicle is out of control so what would be the purpose of attempting to use it if you were already out of control?? Hope that makes sense...
Logistics Pro
Joined: Oct 2006
Posts: 4,028
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From: East Central Ia
I don't believe Ford ever calls them emergency brakes, only parking brakes. Not sure what year it started but mfg. had to supply the braking information on vehicles. It would show the 4 wheel stopping distance, then a partial system failure distance and then total hydraulic failure and only parking brake. I think Fred Flintstone could stop in a shorter distance than just a parking brake.
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Logistics Pro
Joined: Jul 2005
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You can get a better engagement of the parking brake by applying the brakes as you stop the truck, and then engaging the parking brake before lifting off of the service brake pedal.
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From: Knoxville, TN
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
The "automatic adjusters" don't, after some time & corrosion. A little attention to the rear brakes helps quite a bit. Most of the stopping power ~70% is from the front axle so the rears get ignored, but every bit helps. Adjust them manually at least, so there is a light drag on the drums when spinning the wheel.
Lead Driver
Joined: Jul 2017
Posts: 9,580
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From: San Jose, CA
What size tires do you have beartracks? Bigger tires could give the parking brakes a real run for their money.
Were there different size brakes for F100's? Like large and small? If so, maybe you've got the small ones and that would add yet another level of possible weakness with larger tires.
Paul
Were there different size brakes for F100's? Like large and small? If so, maybe you've got the small ones and that would add yet another level of possible weakness with larger tires.
Paul
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Lead Driver
Joined: Nov 2000
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From: Albuquerque
Rears are 255 r60 15. I agree with the adjusters not working too well, even with new everything. I've had good luck with EBC brake products lately. Trucks stops very well, just wonder if I'm getting everything I can outta the back.
