96 F-150 Brake Problem
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96 F-150 Brake Problem
About 6 months ago my front brakes locked up on my way home from work. After getting it home I talked to a few people to figure what had happened to my brakes and as usual there was several answers. After replacing several parts I ended up putting on a new brake booster on and fixed the problem. Now for the last 3 months or so I have developed another brake problem. Under normal driving conditions the braking seems fine but if I have to brake really hard I have no stopping power! This truck is my only transportation so I really need to get it fixed. PLEASE HELP!
Cargo Master
Joined: Mar 2010
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From: Laramie, WY
Check the rear wheel cylinders and lines. My rear cylinders were leaking. I bought new ones on RockAuto.com for $2.25 a piece and bent up new rear lines. Nice to have have braking power back.
What have you replaced up front?
What have you replaced up front?
Cargo Master
Joined: Mar 2010
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From: Laramie, WY
I discovered I had little to no rear brakes after running the rear driveline with the axle on jackstands. Once it started spinning the rear tires I couldn't get them to stop with the foot brake for very long. You could do that check to see if it is a rear issue. But regardless I'd pull the drums and pull back the rubber boots on the rear wheel cylinders, look for seeping brake fluid. Also inspect the rear brake lines, if you're in the salt belt they could very well be trashed.
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No I live in East Tennessee but I will check the rear wheel cylinders. Someone told me about a block that the brake lines run through that can become stopped up and cause similar problems. Do you know anything about that?
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Cargo Master
Joined: Jan 2004
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From: South Dakota
After replacing several parts I ended up putting on a new brake booster on and fixed the problem. Now for the last 3 months or so I have developed another brake problem. Under normal driving conditions the braking seems fine but if I have to brake really hard I have no stopping power! This truck is my only transportation so I really need to get it fixed. PLEASE HELP!
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Cargo Master
Joined: Mar 2010
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From: Laramie, WY
To the OP, there is a proportioning valve that could cause an issue. I've never had to deal with that before though. RABS may be causing an issue, but this sounds more like the system is no longer sealed.
Cargo Master
Joined: Jan 2004
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From: South Dakota
NO that's normal with this vintage Ford vehicles. If you are stopped with the engine running and bear down hard on the brake pedal it will slowly sink to the floor or very near the floor. I didn't realize it until I read it on here and tried it, worked with all my Ford vehicles anyway.
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Try doing a full-on bleed of all brakes with new fluid (obviously starting with the rear passenger wheel). Or have it done professionally.
Fluid cannot compress but air in the lines can. It'll resist compression but will ultimately compress any air in the lines reducing the pressure on the drums/discs.
Fluid cannot compress but air in the lines can. It'll resist compression but will ultimately compress any air in the lines reducing the pressure on the drums/discs.
Senior User
Joined: Nov 2013
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Check for leaks. Check the fluid level in the master cylinder. If the fluid level is low, you know you have a leak. If there are no leaks, I would say it's a bad master cylinder. Just because it was replaced recently doesn't mean it's good. It could be defective.
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Matt Wilson
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 20, 2006 12:37 PM