NEED HELP: Intermittent loss of brakes - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 5 (permalink) Old 08-25-2018, 04:54 PM Thread Starter
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Intermittent loss of brakes

This Newbie to the forum is hoping someone has experienced this before.
I was driving my 2001 F150 SCREW home (about 25km total distance) the other night and the more I drove/braked, the softer the brakes got. By about half way home I was needing to use the parking brake to help slow/stop the truck. By the time I got home, the petal was going to the floor before I got a bit of braking and I was relying pretty much on only the parking brake. When I went out the next morning to check out the situation, the brakes were working fine. This trk has disc brakes all around. Took it to the mechanic for a quick check and they couldn't find anything wrong; fluid looks good and no leaks. I've been driving it locally for a week with no sign of the problem. Consensus from friends is the Master Cylinder or possibly the booster.

Any thoughts on what the issue might be?
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post #2 of 5 (permalink) Old 08-26-2018, 07:04 AM
 
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Welcome to FordTough. I'd have to agree with the master cylinder diagnosis. However, contaminated brake fluid or overheated brakes. Also, if you have them, rear brake adjusters. Calipers seizing may also give a similar feel. Ex-wives/husbands/partners could be affecting the brakes. The booster could be a problem but would have a very different feel. Check for vacuum leaks. If it's hydro-boost, then check your power steering fluid level. Around here, keep a sense of humour handy. We have a tendency to poke the bear.

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post #3 of 5 (permalink) Old 08-26-2018, 03:33 PM Thread Starter
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Thanks Destructicon.
I am planning to replace the brake fluid but without a solid recurrence I'm a bit leery to be driving it on 400 series highways with the potential for brake failure. That's why I was hoping someone here had encountered this and could confirm it was their Master cylinder. If that's the consensus, I might just go ahead and change it as well.
It's a bit odd since the brakes seem just fine at the moment.
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post #4 of 5 (permalink) Old 08-26-2018, 06:48 PM
 
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I've had almost all of the above, except an ex-husband. If you're not losing brake fluid then most likely the master cylinder seals are on their way out.

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The Past - 1976 F-350 Crew Cab 1992 - 2006 RIP
The Past - 1995 F-150 XL Enforcer All Gear Drive 2008 - 2015
The Present - 1993 F-250 XLT Turbo Diesel Super Cab 4x4 2015 - ?
The Future - Who knows?
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post #5 of 5 (permalink) Old 08-27-2018, 09:14 PM Thread Starter
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Thanks.

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