Intermittent brake warning light coming on

SCHIEFTAIN

MEMBER
2007 FORD F-150
5.4L
V8
4WD
AUTOMATIC
91,500 MILES

We recently bought a 2007 F150 Supercab with the 5.4, and have an intermittent brake warning light coming on the dash. Our mech. Diagnosed a bad level switch can you help me fix it? Thanks.

Wednesday, June 11th, 2014 AT 9:59 AM

4 Replies

HMAC300

MECHANIC
48,601 POSTS

You really don't need to disconnect the battery. Unplug the switch/sensor form electrical, suck out most of fluid in master cylinder. On second pic there are two prongs you may have to take a long screwdriver to push the prong in to get the switch out. Then remove it. Install new one and refill reservoir. Yes there will be some fluid drop out o fmaster so put a small pan there to catch it and don't get any fluid on paint it will eat it uup.

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Wednesday, June 11th, 2014 AT 10:45 AM

SCHIEFTAIN

MEMBER
2 POSTS

Can I just re-fill the reservoir with the fluid I take out (assuming I keep it pristine) when finished? Don't have to bleed the brake lines or anything?

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Wednesday, June 11th, 2014 AT 11:54 AM

HMAC300

MECHANIC
48,601 POSTS

Don't be so cheap send the extra $5 for a quart of brake fluid to refill it. Fluid has to be changed every so often anyhow

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Wednesday, June 11th, 2014 AT 11:59 AM

HONESTBILL

MEMBER
1 POST

You don’t need to even take the cap off the reservoir. Just pry the old switch out with a screwdriver. But the switch - look at it - and you see all you need to do is pull it out. Push the new one in and plug it in.

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Monday, November 6th, 2017 AT 1:58 PM